What does code P20DA mean?

Q: What does code P20DA mean?

Exhaust Aftertreatment Fuel Supply Control Circuit High. P20DA means the engine computer has detected an abnormally high voltage on the control circuit for the exhaust aftertreatment fuel supply, which is the system that injects diesel fuel into the exhaust to regenerate the diesel particulate filter. The computer expects a certain voltage range on the control wire, and a reading above that range indicates a short to voltage or an open control circuit.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20DA

P20DAExhaust Aftertreatment Fuel Supply Control Circuit High

P20DA means the engine computer has detected an abnormally high voltage on the control circuit for the exhaust aftertreatment fuel supply, which is the system that injects diesel fuel into the exhaust to regenerate the diesel particulate filter. The computer expects a certain voltage range on the control wire, and a reading above that range indicates a short to voltage or an open control circuit.

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.