What does code P20EC mean?

Q: What does code P20EC mean?

Reductant Heater "A" Control Stuck Off. P20EC means the engine control module has commanded the reductant heater circuit 'A' to turn on, but the circuit feedback indicates it is stuck off, so no current is flowing through the heater element. The computer detects this by monitoring the heater control circuit voltage or current and seeing no expected change when activation is requested.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20EC

P20ECReductant Heater "A" Control Stuck Off

P20EC means the engine control module has commanded the reductant heater circuit 'A' to turn on, but the circuit feedback indicates it is stuck off, so no current is flowing through the heater element. The computer detects this by monitoring the heater control circuit voltage or current and seeing no expected change when activation is requested.

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.