P24D8EVAP System Pressure Sensor/Switch B Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P24D8 reports EVAP pressure sensor B reading above its valid voltage. In GM's 2023 table 23OBDG03A the canister pressure sensor fails above 4.85 V, 97 % of the reference, counted over 640 of 800 samples and treated as Type B. Mitsubishi's 2023 Outlander PHEV applies 4.1 V for 2 s to its absolute tank pressure sensor, which shows about 101 kPa at sea level when healthy. Audi's bulletin 2069531 lists P24D8 as pressure sensor 2 shorted to positive and also shows it among codes logged under a wrong label, to be tested as sensor G950. Common findings are an open sensor ground, a signal wire touching the 5 V or 12 V supply, or an internal failure. Compare P24D7 for the low side.
- What you may notice
- Malfunction indicator lamp on
- EVAP readiness monitor incomplete
- Likely causes
- LikelyOpen ground of sensor B, signal floats high
- PossibleSignal wire shorted to reference or battery voltage
- PossibleEVAP pressure sensor B failed
- 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 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.