What does code P2AF4 mean?

Q: What does code P2AF4 mean?

Starter Relay C Control Circuit High. P2AF4 means the engine control module (ECM) has detected a high-voltage condition on the control circuit for starter relay C, which is the relay that supplies power to the starter solenoid. The ECM expects the control wire to be pulled low when the relay is commanded on, but it is seeing voltage stay high or rise unexpectedly, indicating an open circuit, a short to voltage, or a failed relay coil.

DTC codes / P2Axx · Hybrid propulsion / P2AF4

P2AF4Starter Relay C Control Circuit High

P2AF4 means the engine control module (ECM) has detected a high-voltage condition on the control circuit for starter relay C, which is the relay that supplies power to the starter solenoid. The ECM expects the control wire to be pulled low when the relay is commanded on, but it is seeing voltage stay high or rise unexpectedly, indicating an open circuit, a short to voltage, or a failed relay coil.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

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