What does code P0623 mean?

Q: What does code P0623 mean?

Generator Lamp Control Circuit. P0623 is a generic OBD-II code that indicates the powertrain control module (PCM) has detected a fault in the generator lamp control circuit, which is the wire that commands the battery/charge warning light on the dashboard. The PCM monitors the control circuit for expected voltage changes when it commands the lamp on or off, and it sets this code when the circuit does not respond as expected, often due to an open, short, or excessive resistance.

DTC codes / P06xx · Computer and output circuits / P0623

P0623Generator Lamp Control Circuit

P0623 is a generic OBD-II code that indicates the powertrain control module (PCM) has detected a fault in the generator lamp control circuit, which is the wire that commands the battery/charge warning light on the dashboard. The PCM monitors the control circuit for expected voltage changes when it commands the lamp on or off, and it sets this code when the circuit does not respond as expected, often due to an open, short, or excessive resistance.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.