Symptom Chart

Condition	Possible Sources	Action
The battery is discharged or battery voltage is low	High key-off current drain(s) Engine, generator and battery grounds Positive battery cable Circuitry Battery Generator	Go to Pinpoint Test A .
DTC P0563 - Charging system voltage was higher than 15.9 volts	Bad battery ground High resistance A sense circuit Generator Battery PCM	Go to Pinpoint Test B .
DTC P0620 - Generator control circuit malfunction	Regulator connector not fully inserted Open 2-way harness connector Open GEN COM circuit Shorted GEN COM circuit to ground Shorted GEN COM circuit to B+ Open A sense circuit or fuse Bad PCM ground Generator PCM	Go to Pinpoint Test B .
DTC P0625 - GENMON input to PCM was stuck low	Shorted GENMON circuit to ground Loose connection to B+ circuit Open A sense circuit or fuse Generator PCM Broken front end accessory drive (FEAD) belt	Go to Pinpoint Test B .
DTC P0626 - GENMON input to PCM was stuck high	Open GENMON circuit Shorted GENMON circuit to B+ circuit Open B+ circuit Bad engine ground Generator PCM	Go to Pinpoint Test B .
DTC P065B - GENMON input frequency was continuously less than 80 Hz or continuously more than 200 Hz	Wiring short to GENMON circuit Generator PCM	Go to Pinpoint Test B .
The charging system warning indicator is on with the engine running and no charging system DTCs present	Circuitry PCM Generator Instrument cluster	Go to Pinpoint Test C .
The generator is noisy	Accessory drive belt Loose bolts/brackets Generator/pulley	Go to Pinpoint Test D .
Radio interference	Generator Circuitry In-vehicle entertainment system	Go to Pinpoint Test E .