Diagnostic Trouble Code (DTC) Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
|---|---|---|
P0620 | Generator Control Circuit | The PCM sets this DTC if the GENCOM circuit, "A" sense circuit, or B+ circuit is open or shorted to ground. |
P065B Generator Control Circuit Range/performance | The PCM sets this DTC when the generator reports an internal regulator failure. |
Possible Sources
Fuses or Fusible Links Generator PCM Wiring, terminals or connectors
Visual Inspection and Diagnostic Pre-checks
Inspect the high current BJB for loose or corroded connections.
PINPOINT TEST F : DTC P0620, P065B
NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
NOTE: Do not have a battery charger attached during vehicle testing.
F1 CHECK THE BATTERY CONDITION
Check the battery condition and state of charge. REFER to: Battery (414-01) .
Does the battery pass the condition test?
Yes | GO to F2 |
|---|---|
No | CHARGE or INSTALL a new battery as necessary. REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation). |
F2 CHECK THE GENERATOR CONNECTIONS
Ignition OFF. Disconnect all of the generator connectors and inspect for:
corrosion (install new connector or terminals – clean module pins) damaged or bent pins – install new terminals/pins pushed-out pins – install new pins as necessary
Reconnect the generator connectors. Make sure they seat and latch correctly. Measure and record:
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C102B-1 | Ground |
Is the voltage within 0.5 volt of the recorded battery voltage?
Original table alignment retained · Scroll horizontally if needed
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.