What does code P20CA mean?

Q: What does code P20CA mean?

Reductant Injection Air Pressure Leakage. P20CA indicates that the powertrain control module has detected a leakage in the air pressure circuit used for reductant injection, which is part of the diesel exhaust fluid (DEF) dosing system. The computer monitors the air pressure supply to the reductant injector and sets this code when the pressure drops or fluctuates beyond an expected range, suggesting air is escaping from the system.

DTC codes / P20xx · Fuel and air metering and auxiliary emission controls / P20CA

P20CAReductant Injection Air Pressure Leakage

P20CA indicates that the powertrain control module has detected a leakage in the air pressure circuit used for reductant injection, which is part of the diesel exhaust fluid (DEF) dosing system. The computer monitors the air pressure supply to the reductant injector and sets this code when the pressure drops or fluctuates beyond an expected range, suggesting air is escaping from the system.

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.