What does code P2ACF mean?

Q: What does code P2ACF mean?

Reductant Temperature Sensor B Circuit High. P2ACF means the engine control module has detected an abnormally high voltage on the signal circuit for reductant temperature sensor B, which is a second temperature sensor used to monitor the diesel exhaust fluid (DEF) system. The sensor's resistance normally changes with temperature, and a high voltage reading tells the module that the circuit is open, shorted to voltage, or the sensor has failed in a way that produces an unrealistically high signal.

DTC codes / P2Axx · Hybrid propulsion / P2ACF

P2ACFReductant Temperature Sensor B Circuit High

P2ACF means the engine control module has detected an abnormally high voltage on the signal circuit for reductant temperature sensor B, which is a second temperature sensor used to monitor the diesel exhaust fluid (DEF) system. The sensor's resistance normally changes with temperature, and a high voltage reading tells the module that the circuit is open, shorted to voltage, or the sensor has failed in a way that produces an unrealistically high signal.

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.