P0623
PowertrainCharging Systemlow severityGenerator Lamp Control Circuit
What P0623 Means
The PCM detected a fault in the generator lamp control circuit. The charging system warning indicator may fail to work properly.
Symptoms
- Charge warning lamp inoperative
- Lamp stays illuminated
- Charging fault indication
Common Causes
- Lamp control circuit wiring fault
- Faulty bulb or indicator
- Corroded connectors
- Faulty PCM
Diagnostic Steps
- Check lamp control circuit continuity
- Inspect indicator bulb and cluster
- Test connectors and grounds
- Repair circuit or replace component
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