What does code P20AE mean?

Q: What does code P20AE mean?

Reductant Metering Unit Temperature Sensor Circuit Low. P20AE indicates that the powertrain control module has detected a low voltage signal from the reductant metering unit temperature sensor circuit, which monitors the temperature of the diesel exhaust fluid injector assembly. The sensor's signal is below the expected range, suggesting a short to ground, an open circuit, or a faulty sensor.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20AE

P20AEReductant Metering Unit Temperature Sensor Circuit Low

P20AE indicates that the powertrain control module has detected a low voltage signal from the reductant metering unit temperature sensor circuit, which monitors the temperature of the diesel exhaust fluid injector assembly. The sensor's signal is below the expected range, suggesting a short to ground, an open circuit, or a faulty sensor.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary 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.