What does code P20AB mean?

Q: What does code P20AB mean?

Reductant Injection Air Pressure Control Valve Stuck Closed. P20AB indicates that the powertrain control module (PCM) has commanded the reductant injection air pressure control valve to move, but the valve has not responded as expected and is stuck in the closed position. The PCM monitors the valve's electrical circuit and the resulting air pressure in the reductant injection system, and it sets this code when the pressure does not change or the valve feedback does not match the command.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20AB

P20ABReductant Injection Air Pressure Control Valve Stuck Closed

P20AB indicates that the powertrain control module (PCM) has commanded the reductant injection air pressure control valve to move, but the valve has not responded as expected and is stuck in the closed position. The PCM monitors the valve's electrical circuit and the resulting air pressure in the reductant injection system, and it sets this code when the pressure does not change or the valve feedback does not match the command.

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.