What does code P24CF mean?

Q: What does code P24CF mean?

Reductant Tank Cap Switch Circuit Intermittent or Erratic. P24CF means the engine control module (ECM) has detected an intermittent or erratic signal from the reductant tank cap switch circuit, which monitors whether the diesel exhaust fluid (DEF) tank cap is properly closed. The ECM expects a stable voltage or resistance from the cap switch, and when the signal jumps or drops out unpredictably, it logs this code.

DTC codes / P24xx · Auxiliary emission controls / P24CF

P24CFReductant Tank Cap Switch Circuit Intermittent or Erratic

P24CF means the engine control module (ECM) has detected an intermittent or erratic signal from the reductant tank cap switch circuit, which monitors whether the diesel exhaust fluid (DEF) tank cap is properly closed. The ECM expects a stable voltage or resistance from the cap switch, and when the signal jumps or drops out unpredictably, it logs this code.

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.