What does code P24E1 mean?

Q: What does code P24E1 mean?

NH3 Sensor Circuit. P24E1 indicates that the powertrain control module has detected a fault in the ammonia (NH3) sensor circuit, which is used on selective catalytic reduction systems to monitor ammonia slip. The computer compares the sensor signal voltage to expected values and sets this code when the circuit is open, shorted, or out of range.

DTC codes / P24xx · Auxiliary emission controls / P24E1

P24E1NH3 Sensor Circuit

P24E1 indicates that the powertrain control module has detected a fault in the ammonia (NH3) sensor circuit, which is used on selective catalytic reduction systems to monitor ammonia slip. The computer compares the sensor signal voltage to expected values and sets this code when the circuit is open, shorted, or out of range.

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.