Common Symptoms
- Check engine light illuminated
- Intermittent electrical accessory operation
- Instrument cluster flickering or dimming
- Engine stalling or hesitation during startup
- Battery warning light may be on
- Rough idle or poor engine performance
Most Likely Root Causes
- Failing alternator or voltage regulator
- Weak or discharged battery
- Corroded or loose battery terminals and cables
- Faulty PCM power supply circuit or ground connection
- Damaged wiring between battery and PCM
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Component Location
The PCM monitors system voltage from the battery through main power supply circuits typically connected near the battery and PCM connector.
Manufacturer Notes
Some vehicle manufacturers have specific voltage range tolerances that trigger this code during key-on or engine running conditions.
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