What does code P2DF4 mean?

Q: What does code P2DF4 mean?

Coolant Pump E Control Circuit/Open. P2DF4 indicates that the engine control module (ECM) has detected an open circuit or no continuity on the electrical path for the coolant pump designated as 'E'. This pump is typically an auxiliary electric pump used for charge air cooling or battery thermal management, and the ECM monitors the control circuit for expected voltage or current; an open circuit means the pump cannot be commanded on, which may lead to overheating of the component it cools.

DTC codes / P2Dxx · Hybrid propulsion / P2DF4

P2DF4Coolant Pump E Control Circuit/Open

P2DF4 indicates that the engine control module (ECM) has detected an open circuit or no continuity on the electrical path for the coolant pump designated as 'E'. This pump is typically an auxiliary electric pump used for charge air cooling or battery thermal management, and the ECM monitors the control circuit for expected voltage or current; an open circuit means the pump cannot be commanded on, which may lead to overheating of the component it cools.

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.