DTC codes / P04xx · Auxiliary emission controls / P04E5
P04E5 indicates that the powertrain control module has detected an electrical fault in the signal circuit for the EGR temperature sensor, specifically the 'D' circuit which is often the sensor's return or ground path. The computer monitors the voltage on this circuit and flags the code when the reading falls outside the expected range for the current operating conditions.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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