Code
P1673
ALFA ROMEO
P — Powertrain
Voltage condition 1 fault
Views:
UK: 16
EN: 22
RU: 21
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
BUICK
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 24
EN: 42
RU: 33
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
CADILLAC
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 24
EN: 36
RU: 33
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
CHEVROLET
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 18
EN: 31
RU: 27
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
DAEWOO
P — Powertrain
Can comm flt(signal err)
Views:
UK: 19
EN: 25
RU: 24
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
FIAT
P — Powertrain
Voltage condition 1 fault
Views:
UK: 18
EN: 25
RU: 23
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
GM
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 21
EN: 36
RU: 32
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
GMC
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 28
EN: 39
RU: 34
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
HUMMER
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 18
EN: 26
RU: 20
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
69
Browse 69 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
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Code
P1673
OLDSMOBILE
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 24
EN: 43
RU: 34
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1673
PORSCHE
P — Powertrain
Fan output stage
Views:
UK: 14
EN: 20
RU: 16
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for PORSCHE
127
Browse 127 PORSCHE manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
PORSCHE
-
PORSCHE: 2021
-
718 Spyder
-
911
- Carrera, 2D Convertible
- Carrera, 2D Coupe
- Carrera 4, 2D Convertible
- Carrera 4, 2D Coupe
- Carrera 4S, 2D Convertible, Automatic DCT Trans
- Carrera 4S, 2D Convertible, Standard Trans
- Carrera 4S, 2D Coupe, Automatic DCT Trans
- Carrera 4S, 2D Coupe, Standard Trans
- Carrera S, 2D Convertible, Automatic DCT Trans
- Carrera S, 2D Convertible, Standard Trans
- Carrera S, 2D Coupe, Automatic DCT Trans
- Carrera S, 2D Coupe, Standard Trans
- Targa 4
- Targa 4S, Automatic DCT Trans
- Targa 4S, Standard Trans
- Targa 4S Heritage Design Ed., Automatic DCT Trans
- Targa 4S Heritage Design Ed., Standard Trans
- Turbo, 2D Convertible
- Turbo, 2D Coupe
- Turbo S, 2D Convertible
- Turbo S, 2D Coupe
-
Cayenne
- Base, 4D Utility Coupe
- Base, 4D Utility Wagon
- E-Hybrid, 4D Utility Coupe
- E-Hybrid, 4D Utility Wagon
- GTS, 4D Utility Coupe
- GTS, 4D Utility Wagon
- S, 4D Utility Coupe
- S, 4D Utility Wagon
- Turbo, 4D Utility Coupe
- Turbo, 4D Utility Wagon
- Turbo S E-Hybrid, 4D Utility Coupe
- Turbo S E-Hybrid, 4D Utility Wagon
-
Macan
-
PORSCHE: 2020
-
718 Spyder
-
Macan
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Code
P1673
RAM
P — Powertrain
Boost Pressure Sensor Supply
Views:
UK: 18
EN: 22
RU: 16
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1673
SATURN
P — Powertrain
Engine Hot Lamp Control Circuit
Views:
UK: 25
EN: 38
RU: 29
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Poor battery terminal connection or corroded cables
- Faulty alternator or voltage regulator
- High resistance or broken ground strap(s)
- Damaged wiring or connector to ECU or charging circuit
- Blown fuse or fusible link in charging/power feed
Symptoms
- Battery/warning lamp illuminated on dash
- Intermittent electrical faults or flickering gauges/lights
- Hard/slow starting or no-start conditions
- Engine stall or torque reduction/limp mode
- Unexpected shutdowns of accessories or ECU resets
- Multiple related voltage or charging DTCs may be present
What to check
- Read and record all stored and pending DTCs and freeze-frame data
- Measure battery resting voltage (key off) and record value
- Measure battery voltage while cranking and while engine idling/running
- Inspect battery terminals, cable jackets, and ground straps for corrosion, looseness or damage
- Check alternator output at battery and at alternator terminal under load
- Verify fuses and fusible links for charging/power circuits
Signal parameters
- Battery resting voltage (key off): approx 12.4–12.8 V expected
- Cranking voltage: usually >9.0 V (depends on vehicle/temperature)
- Charging voltage (engine running, no load): approx 13.5–14.8 V expected
- Over-voltage events: sustained >15–16 V can trigger faults
- Undervoltage threshold: sustained
- Transient spikes or rapid voltage fluctuations indicate wiring or regulator issues
Diagnostic algorithm
- Record DTCs and freeze-frame. Note battery voltage at time of fault if available.
- Visually inspect battery, terminals, cables, and ground straps. Clean and tighten connections as required.
- Measure and record battery voltage: key off, during crank, and engine running at idle and higher RPM. Compare to expected ranges.
- Perform battery capacity/load test; replace battery if weak or fails load test.
- Test alternator output at alternator B+ and at battery with engine idling and under electrical load (headlights, heater fan).
- Check voltage regulator operation (onboard or external) and alternator warning/light circuit for proper switching.
- Inspect and backprobe wiring/connectors between alternator, battery, and ECU for voltage drops, intermittent connections, or grounding issues.
- Check fuses/fusible links and relays in charging/power circuits; replace any faulty protective devices.
- If parasitic drain suspected, perform draw test and isolate circuit causing excessive drain.
- If all wiring, battery and alternator test good, consider ECU power/ground and reference circuits; check for software updates and consult technical service info before replacing ECU.
- Clear codes, perform required drive cycle and verify fault does not return before concluding repair.
Likely causes
- Loose/corroded battery terminals or cable (most common)
- Alternator/voltage regulator failing to maintain charging voltage
- Bad ground(s) between engine/chassis and battery
- Low battery state-of-charge or end-of-life battery
- Damaged wiring/connector between alternator and ECU
Fault status
Status
Voltage condition 1 fault — ECU detected abnormal/unstable vehicle electrical system voltage (overvoltage, undervoltage or transient)
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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0
Send to email