What does code P24E3 mean?

Q: What does code P24E3 mean?

NH3 Sensor Circuit Low. P24E3 means the engine control module has detected a low voltage condition on the ammonia (NH3) sensor circuit, which is used on diesel vehicles with selective catalytic reduction to monitor ammonia slip. The computer compares the sensor signal to an expected range and flags the circuit as low when the voltage stays below the calibrated threshold for a set time.

DTC codes / P24xx · Auxiliary emission controls / P24E3

P24E3NH3 Sensor Circuit Low

P24E3 means the engine control module has detected a low voltage condition on the ammonia (NH3) sensor circuit, which is used on diesel vehicles with selective catalytic reduction to monitor ammonia slip. The computer compares the sensor signal to an expected range and flags the circuit as low when the voltage stays below the calibrated threshold for a set time.

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.