What does code P20A3 mean?

Q: What does code P20A3 mean?

Reductant Purge Control Valve A Circuit High. P20A3 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the reductant purge control valve, which is part of the diesel exhaust fluid (DEF) system. The PCM expects the circuit to pull to a certain voltage when the valve is commanded, but the signal remains above the expected threshold, indicating an open circuit, a short to voltage, or a faulty valve.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20A3

P20A3Reductant Purge Control Valve A Circuit High

P20A3 indicates that the powertrain control module (PCM) has detected an abnormally high voltage on the control circuit for the reductant purge control valve, which is part of the diesel exhaust fluid (DEF) system. The PCM expects the circuit to pull to a certain voltage when the valve is commanded, but the signal remains above the expected threshold, indicating an open circuit, a short to voltage, or a faulty valve.

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.