What does code P04B3 mean?

Q: What does code P04B3 mean?

Refueling Vapor Control Valve Performance/Stuck Open. P04B3 indicates that the powertrain control module has detected a performance fault in the refueling vapor control valve circuit, specifically that the valve is stuck open or not responding as commanded. The computer monitors the valve's electrical circuit and its effect on the evaporative emissions system, and it sets this code when the valve fails to close properly or the circuit shows an unexpected condition during the refueling vapor control self-test.

DTC codes / P04xx · Auxiliary emission controls / P04B3

P04B3Refueling Vapor Control Valve Performance/Stuck Open

P04B3 indicates that the powertrain control module has detected a performance fault in the refueling vapor control valve circuit, specifically that the valve is stuck open or not responding as commanded. The computer monitors the valve's electrical circuit and its effect on the evaporative emissions system, and it sets this code when the valve fails to close properly or the circuit shows an unexpected condition during the refueling vapor control self-test.

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.