What does code P04E8 mean?

Q: What does code P04E8 mean?

EGR Temperature Sensor D Circuit High. P04E8 means the engine computer has detected an abnormally high voltage on the signal circuit for EGR temperature sensor D, which is typically the sensor monitoring the exhaust gas recirculation cooler outlet on one bank of a V-style engine. The computer expects the sensor's signal voltage to stay within a calibrated range, and a sustained high reading tells it the circuit is open, shorted to voltage, or the sensor element has failed.

DTC codes / P04xx · Auxiliary emission controls / P04E8

P04E8EGR Temperature Sensor D Circuit High

P04E8 means the engine computer has detected an abnormally high voltage on the signal circuit for EGR temperature sensor D, which is typically the sensor monitoring the exhaust gas recirculation cooler outlet on one bank of a V-style engine. The computer expects the sensor's signal voltage to stay within a calibrated range, and a sustained high reading tells it the circuit is open, shorted to voltage, or the sensor element has failed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

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