What does code P24C4 mean?

DTC codes / P24xx · Auxiliary emission controls / P24C4

P24C4EGR Cooler Bypass Position Sensor Exceeded Learning Limit Bank 1

P24C4 means the engine computer has learned that the EGR cooler bypass position sensor's feedback no longer falls within the expected range during its self-calibration routine, so it cannot reliably command the bypass valve. The computer detected that the sensor's learned position has drifted past the allowable limit, which usually points to a mechanical or electrical fault in the bypass valve or its sensor circuit.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

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.