P24BDEVAP System Leak Detection Pump Switching Valve Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P24BD points to the drive circuit of the switching valve inside the leak check module. This small solenoid moves the canister vent path between open air and the reference orifice, so the module can first measure a known leak and then test the real system. The code stands for an open or generally faulty control circuit. No manufacturer documents P24BD publicly; Mitsubishi's 2023 Outlander PHEV splits the same valve into P24BE and P24BF, where the valve is fed from a relay and switched to ground by the engine computer. CARB requires output components like this to be checked for circuit faults. Without a working valve the leak test cannot run; in Mitsubishi's design purge is blocked and the fuel door stays locked.
- What you may notice
- Malfunction indicator lamp on
- EVAP leak test does not run
- On some designs fuel door locked or purge disabled
- Likely causes
- LikelySwitching valve coil open inside the leak check module
- PossibleOpen control or supply wire, blown fuse or relay fault
- PossibleCorroded connector at the module
- RareOutput driver in the engine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.