What does code P2063 mean?

Q: What does code P2063 mean?

Reductant Supply Control Circuit Low. P2063 indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current on the reductant supply control circuit, which is part of the diesel exhaust fluid (DEF) system used to reduce nitrogen oxide emissions. The PCM monitors the circuit that powers the DEF supply pump or heater and sets this code when the signal falls below the expected range, often due to a short to ground, an open circuit, or a failed component.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P2063

P2063Reductant Supply Control Circuit Low

P2063 indicates that the powertrain control module (PCM) has detected an abnormally low voltage or current on the reductant supply control circuit, which is part of the diesel exhaust fluid (DEF) system used to reduce nitrogen oxide emissions. The PCM monitors the circuit that powers the DEF supply pump or heater and sets this code when the signal falls below the expected range, often due to a short to ground, an open circuit, or a failed component.

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.