What does code P24CB mean?

Q: What does code P24CB mean?

Reductant Tank Cap Switch Circuit. P24CB indicates that the powertrain control module has detected an abnormal condition in the electrical circuit of the reductant tank cap switch, which is the sensor that confirms the diesel exhaust fluid filler cap is properly closed and sealed. The computer monitors the switch signal for expected voltage or continuity and sets this code when the reading falls outside the programmed range, often due to an open circuit, short, or mechanical switch failure.

DTC codes / P24xx · Auxiliary emission controls / P24CB

P24CBReductant Tank Cap Switch Circuit

P24CB indicates that the powertrain control module has detected an abnormal condition in the electrical circuit of the reductant tank cap switch, which is the sensor that confirms the diesel exhaust fluid filler cap is properly closed and sealed. The computer monitors the switch signal for expected voltage or continuity and sets this code when the reading falls outside the programmed range, often due to an open circuit, short, or mechanical switch failure.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary 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.