Code
P0560
Generic
P — Powertrain
System Voltage
Views:
UK: 34
EN: 42
RU: 32
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
GWM
P — Powertrain
- The system voltage is incorrectly adjusted
Views:
UK: 16
EN: 26
RU: 19
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
HUMMER
P — Powertrain
System Voltage
Views:
UK: 24
EN: 30
RU: 20
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
ISUZU
P — Powertrain
System Voltage
Views:
UK: 25
EN: 33
RU: 22
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
LAND ROVER
P — Powertrain
Malfunction of system voltage
Views:
UK: 15
EN: 22
RU: 19
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
MERCEDES-BENZ
P — Powertrain
System Voltage Malfunction
Views:
UK: 23
EN: 27
RU: 20
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
OPEL
P — Powertrain
System Voltage Too High
Views:
UK: 22
EN: 23
RU: 16
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0560
SEAT
P — Powertrain
Battery voltage - out of range
Views:
UK: 17
EN: 20
RU: 12
AI status
Completed
Completed
100%
Causes
- Weak or discharged battery
- Faulty alternator or internal voltage regulator
- Loose, corroded or damaged battery cables/terminals
- Poor engine or chassis ground(s)
- Blown fusible link or charging system fuse
- High electrical load or short/parasite draw
Symptoms
- Battery/charging system warning lamp illuminated
- Dim or overly bright headlights and interior lights
- Intermittent or no-crank / hard starting
- Erratic instrument cluster or electronic module behavior
- Vehicle stalls or runs poorly under electrical load
- Battery draining when vehicle is off
What to check
- Check DTC freeze frame and any stored related codes before clearing
- Visually inspect battery, terminals and cables for corrosion, looseness or damage
- Verify alternator drive belt condition and tension
- Check main fuses and fusible links related to charging circuit
- Measure battery resting (key off) voltage and cranking voltage with a multimeter
- Measure charging system voltage with engine running and under load
Signal parameters
- Battery voltage (key off, fully charged): ~12.4–12.8 V
- Cranking voltage: typically >9.5–10.5 V depending on battery and starter condition
- Charging voltage (engine idle to operating RPM): ~13.5–14.8 V
- Fault thresholds commonly generate P0560 if voltage falls below ~11–11.5 V or rises above ~16 V (manufacturer-specific)
- Alternator AC ripple should be low; excessive AC (measured as volts AC) indicates rectifier diode failure
Diagnostic algorithm
- Capture and record freeze-frame data and all stored/related codes; do not clear codes yet.
- Visual inspection: battery condition, terminal corrosion, tightness of battery cables, fusible links, alternator belt, engine/chassis grounds and wiring harness connectors.
- Measure battery voltage with key off. If below ~12.4 V, charge battery and perform a battery capacity/load test. Replace if it fails.
- With vehicle running, measure charging voltage at battery positive. Expect ~13.5–14.8 V. If low/high, proceed to alternator testing.
- Perform alternator output test: check DC output under increased load (headlights/ac on). Check AC ripple with AC range; excessive ripple indicates bad diodes/rectifier.
- Test voltage regulator function (internal or external) per manufacturer procedure. If regulator external, bench-test or substitute known-good unit.
- Inspect and perform voltage drop tests on positive and ground circuits between battery, alternator and PCM (look for >0.2 V on ground/high-current positive circuits at rated current).
- Check charging circuit fuses/fusible links and starter motor wiring for damage or high resistance.
- Investigate parasitic drain if battery discharges with vehicle off: measure current draw using ammeter in series with battery negative.
- If wiring, connectors and components pass tests, consider PCM voltage-sense circuit diagnostics or replacement as last resort. After repairs, clear codes and road-test to verify no recurrence.
Likely causes
- Battery with low state of charge or failing cells
- Loose or corroded battery terminals or battery-to-chassis ground
- Faulty alternator diodes or voltage regulator failure
- Broken or high-resistance cable/connector at alternator or fusebox
- Blown main fuse/fusible link in charging circuit
- Aftermarket accessory drawing excessive current
Fault status
Status
System voltage out of expected range; charging or battery voltage abnormal.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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