Code
P1602
ALFA ROMEO
P — Powertrain
A / Dconverter | Batteryvoltage | Voltagecircuit | Voltage regulator
Views:
UK: 8
EN: 9
RU: 7
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
BMW
P — Powertrain
Control Module Self Test Control Module Defective
Views:
UK: 25
EN: 42
RU: 30
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
BUICK
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 21
EN: 36
RU: 27
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
CADILLAC
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 20
EN: 38
RU: 30
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
CHEVROLET
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 18
EN: 34
RU: 26
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
CHRYSLER
P — Powertrain
PCM Not Programmed
Views:
UK: 21
EN: 42
RU: 29
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
DAEWOO
P — Powertrain
Ecu - tcu comm mal
Views:
UK: 6
EN: 8
RU: 7
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Send to email
Code
P1602
DAIHATSU
P — Powertrain
Communicate with A/T system
Views:
UK: 3
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
DODGE
P — Powertrain
PCM Not Programmed
Views:
UK: 25
EN: 39
RU: 33
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
FIAT
P — Powertrain
A / Dconverter | Batteryvoltage | Voltagecircuit | Voltage regulator
Views:
UK: 7
EN: 9
RU: 8
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
GM
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 22
EN: 38
RU: 26
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
GMC
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 23
EN: 38
RU: 32
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
HUMMER
P — Powertrain
Knock Sensor (KS) Module Performance
Views:
UK: 11
EN: 22
RU: 12
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
JEEP
P — Powertrain
PCM Not Programmed
Views:
UK: 18
EN: 39
RU: 26
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
LAND ROVER
P — Powertrain
Communication error of the immobilizer / engine control module
Views:
UK: 8
EN: 17
RU: 9
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
MAZDA
P — Powertrain
Powertrain Control Module Communication Line To TCM Error, Immobilizer System Communication Error With Powertrain Control Module
Views:
UK: 19
EN: 36
RU: 26
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
MITSUBISHI
P — Powertrain
System LSI communication
Views:
UK: 12
EN: 18
RU: 14
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
OLDSMOBILE
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 23
EN: 40
RU: 29
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
OPEL
P — Powertrain
Top Speed not Programmed
Views:
UK: 7
EN: 10
RU: 10
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
Other
P — Powertrain
Immobilizer/ECM Communication Error
Views:
UK: 18
EN: 37
RU: 27
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
PLYMOUTH
P — Powertrain
PCM Not Programmed
Views:
UK: 22
EN: 38
RU: 27
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
PONTIAC
P — Powertrain
PCM Not Programmed
Views:
UK: 19
EN: 37
RU: 29
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
PORSCHE
P — Powertrain
Voltage supply
Views:
UK: 5
EN: 6
RU: 5
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
SAAB
P — Powertrain
Fuel Pump Relay, Output Form Control Module Low
Views:
UK: 3
EN: 8
RU: 5
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
SATURN
P — Powertrain
Loss Of EBTCM Serial Data
Views:
UK: 20
EN: 38
RU: 32
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
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Code
P1602
VOLKSWAGEN
P — Powertrain
Power Supply Terminal No 30 Low Voltage
Views:
UK: 21
EN: 48
RU: 29
AI status
Completed
Completed
100%
Causes
- Low or high battery/charging system voltage
- Faulty alternator or voltage regulator
- Loose, corroded or damaged battery terminals and ground connections
- Open or shorted wiring between battery/alternator and ECU (voltage sense circuit)
- Blown fuse or fusible link in charging/battery supply circuit
- Faulty ECU A/D converter or internal voltage-sensing circuitry
Symptoms
- Battery warning light or charging system warning on dash
- Vehicle may not start or cranks slowly
- Dimming or flickering lights and accessories
- Erratic instrument cluster behavior or incorrect gauge readings
- Engine stalling or poor running if ECU limits operation
- Stored multiple voltage-related fault codes
What to check
- Read and record freeze-frame data and live battery voltage using a scan tool
- Check battery resting voltage with engine off (multimeter)
- Measure charging voltage at battery with engine running (idle and ~2000 rpm)
- Inspect and clean battery terminals, cable ends and chassis/engine grounds
- Check fuses and fusible links for battery/ECU supply circuits
- Inspect wiring and connectors for damage, corrosion, loose pins, or water ingress
Signal parameters
- Battery voltage (engine off): typical 12.4–12.8 V
- Charging voltage (engine running, normal): typical 13.5–14.8 V
- Excessive charging: >15.5 V indicates possible regulator failure
- Voltage drop across battery terminals under cranking: should be small (
- AC ripple at alternator output: normally
- ECU A/D reference (manufacturer-specific): often ~5 V reference — consult wiring diagram before measuring
Diagnostic algorithm
- Connect an OEM-capable scan tool, confirm P1602 and note freeze-frame/live voltage values; clear the code and see if it returns.
- Visually inspect battery, terminals, engine and chassis grounds, and all related fuses; clean and tighten battery terminals and main ground straps.
- Measure battery resting voltage with a digital multimeter; if
- Start engine and measure charging voltage at the battery at idle and ~2000 rpm; compare to expected charging range (approx. 13.5–14.8 V).
- Perform AC ripple test at alternator/battery to check for diode/rectifier failure; significant ripple requires alternator service or replacement.
- With ignition off, inspect and backprobe the ECU battery-sense / B+ / VIN pin and measure presence and stability of battery voltage; check ground reference at ECU.
- Check continuity and voltage drop of supply and ground circuits between battery and ECU; repair corroded/poor connections or damaged wiring.
- Inspect and test any charging-system control fuses, relays and regulator wiring. Replace faulty components as identified and retest.
- If wiring, battery and alternator are verified good and voltage signals are within spec but code persists, suspect internal ECU A/D converter failure; consult manufacturer service procedures for ECU bench testing or replacement.
- After repairs, clear codes, perform a road test and monitor voltage and related parameters; confirm P1602 does not return.
Likely causes
- Weak or discharged battery (low resting voltage)
- Bad alternator/regulator producing overvoltage or no charge
- Poor battery negative ground or ECU ground connection
- Corroded battery terminals or poor cable connection to starter/engine
- Damaged or loose connector/pin at ECU B+ / VIN / battery-sense pin
- Intermittent wiring harness fault (pinch, rodent damage)
Fault status
Status
ECU reports abnormal battery/charging voltage input to its A/D converter or a failure in the voltage regulation/sensing circuit. Investigate charging system, battery connections, wiring and ECU supply circuits.
Repair difficulty: Medium
Diagnostic time: 1.0 - 2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email