Code
P0562
Generic
P — Powertrain
System Voltage Low
Views:
UK: 30
EN: 38
RU: 56
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop ManualAudi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop ManualAUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop ManualAudi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop ManualAudi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop ManualAudi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop ManualAudi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop ManualAudi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop ManualAudi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop ManualAudi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop ManualAudi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop ManualLAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
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Code
P0562
GWM
P — Powertrain
- System Low Voltage
Views:
UK: 5
EN: 8
RU: 10
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0562
HUMMER
P — Powertrain
System Voltage Low (TCM)
Views:
UK: 17
EN: 17
RU: 39
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
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Code
P0562
LAND ROVER
P — Powertrain
Low system voltage
Views:
UK: 11
EN: 13
RU: 34
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop ManualLand Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop ManualLand Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop ManualYour experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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👍 Like
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Code
P0562
MERCEDES-BENZ
P — Powertrain
System Voltage Low
Views:
UK: 22
EN: 20
RU: 44
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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Code
P0562
MITSUBISHI
P — Powertrain
Battery voltage too low
Views:
UK: 18
EN: 17
RU: 39
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
Code
P0562
SEAT
P — Powertrain
Battery voltage - low
Views:
UK: 3
EN: 3
RU: 8
AI status
Completed
Completed
100%
Causes
- Weak, discharged, or failing battery
- Poor or corroded battery terminals or cable connections
- Faulty alternator or voltage regulator
- Loose, corroded, or damaged ground or power wiring
- Blown fusible link or charging system fuse
- High parasitic electrical draw (drain) while vehicle is off
Symptoms
- Battery warning lamp or charging system light illuminated
- Dim headlights, interior lights, or dashboard illumination
- Slow cranking or no-crank condition
- Intermittent or permanent stalling, rough running or loss of power
- Multiple electrical accessories failing or behaving erratically
- Reduced or no alternator charging when engine is running
What to check
- Scan for stored and pending codes, note freeze-frame data and timestamp
- Visually inspect battery, cables, terminals, fusible links and main fuses for corrosion, damage or looseness
- Measure battery voltage (engine off) at battery terminals with a digital multimeter
- Measure voltage at battery during crank and with engine running; compare to expected ranges
- Check alternator output and regulator operation (voltage and AC ripple) under no-load and loaded conditions
- Inspect and clean engine/chassis ground straps and battery cable connections
Signal parameters
- Typical resting (key-off) battery voltage: ~12.6–12.8 V for a healthy, fully charged battery
- Cranking voltage: normally should not fall below ~9–10 V on many vehicles (varies by spec)
- Normal charging voltage with engine running: ~13.5–14.8 V
- Low-voltage condition often considered below ~11–12 V for PCM detection — exact threshold depends on manufacturer/vehicle
- PCM monitors battery/charging sense circuit voltage and compares to thresholds over time before setting P0562
Diagnostic algorithm
- Retrieve all codes and freeze-frame data; note any other related codes (charging, communication, battery sensor).
- Perform a visual inspection: battery condition, terminal corrosion, cable integrity, alternator connections, fusible links and ground straps; repair/clean as needed.
- With a good-quality DMM, measure battery voltage at the battery posts (engine off). If low (
- Measure voltage during starter crank and with engine idling. Verify alternator charging voltage (~13.5–14.8 V). If alternator not charging, check drive belt condition/tension, alternator connector and field/charge circuits.
- Check voltage at the PCM battery-sense/power input terminal and compare to battery post voltage to find voltage drops across cables/connectors.
- If voltage drop exists, isolate and repair high-resistance connection (clean/tighten/replace cables or ground straps).
- If alternator output is abnormal, bench or vehicle-test the alternator and replace or rebuild as required.
- If battery and alternator test good, perform parasitic draw test to identify excessive current drain; remove/disable accessories to localize source.
- If wiring and components check good and voltage sense at PCM is correct, consider PCM input circuit tests per manufacturer procedures or consult technical service information before replacing ECM/PCM.
- After repairs, clear codes and road test; verify voltage stays within normal range and code does not return.
Likely causes
- Battery state-of-charge low or poor battery health (most common)
- Corroded or loose battery positive/negative terminals or cable ends
- Alternator not producing proper charge (worn brushes/diode/regulator)
- Poor engine or chassis ground connection causing voltage drop
- Blown fusible link or main charging/ignition fuse
- Parasitic draw from aftermarket equipment or failed accessory
Fault status
Status
System voltage below expected operating threshold detected by control module. Inspect battery, charging system, main power/ground connections and electrical loads.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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
0
👎 Dislike
0
Send to email