P24BCEVAP System Leak Detection Pump Pressure Sensor Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P24BC is meant for a pressure signal from the leak check module that drops out or jumps briefly, too short to latch the low or high limit. No manufacturer documents P24BC publicly. The closest published logic is Mitsubishi's noise check on the same sensor in the 2023 Outlander PHEV, which counts signal crossings during the engine-off test and fails above 20 events, but Mitsubishi reports that under P24B9. CARB expects EVAP sensors to be watched for circuit faults as well as erratic behaviour. Because the fault comes and goes, check the harness near the canister and fuel tank for chafing, water in the connector and loose terminals before replacing the module. Steady faults are P24BA (low) and P24BB (high).
- What you may notice
- Malfunction indicator lamp on, sometimes going out again
- EVAP readiness monitor completes only occasionally
- Likely causes
- LikelyLoose or spread terminal in the leak check module connector
- PossibleHarness chafing near the canister or tank, intermittent short or break
- PossibleWater or corrosion in the module connector
- RareSensor in the leak check module failing intermittently
- 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: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.