What does code P24E2 mean?

Q: What does code P24E2 mean?

NH3 Sensor Circuit Range or Performance. P24E2 indicates that the engine control module has detected an out-of-range or performance 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 against expected values and sets this code when the signal is erratic, stuck, or outside the normal operating range.

DTC codes / P24xx · Auxiliary emission controls / P24E2

P24E2NH3 Sensor Circuit Range or Performance

P24E2 indicates that the engine control module has detected an out-of-range or performance 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 against expected values and sets this code when the signal is erratic, stuck, or outside the normal operating range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

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.