What does code P24EA mean?

Q: What does code P24EA mean?

NH3 Sensor Supply Voltage Circuit. P24EA indicates that the powertrain control module has detected an abnormal voltage on the supply circuit feeding the ammonia (NH3) sensor, which is used to monitor nitrogen oxide reduction in selective catalytic reduction systems. The computer compares the supply voltage against expected values and sets this code when the circuit is open, shorted, or drawing excessive current.

DTC codes / P24xx · Auxiliary emission controls / P24EA

P24EANH3 Sensor Supply Voltage Circuit

P24EA indicates that the powertrain control module has detected an abnormal voltage on the supply circuit feeding the ammonia (NH3) sensor, which is used to monitor nitrogen oxide reduction in selective catalytic reduction systems. The computer compares the supply voltage against expected values and sets this code when the circuit is open, shorted, or drawing excessive current.

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.