P24D7EVAP System Pressure Sensor/Switch B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P24D7 is set when EVAP pressure sensor B sends a voltage below its valid window. GM's 2023 table (23OBDG03A) watches its canister pressure sensor continuously and fails below 0.15 V, 3 % of the reference, with 640 of 800 samples, Type B; the sensor normally works between 0.5 and 4.5 V. Mitsubishi's 2023 Outlander PHEV uses a far higher floor for its absolute tank pressure sensor: under 1.0 V for 2 s. Audi's bulletin 2069531 shows P24D7 as pressure sensor 2 shorted to ground on 2022–2023 four-cylinder models and steers the test to sensor G950. Expect a signal wire grounded, a missing 5 V reference or a failed sensor. P24D8 is the high side, P24D6 a reading that is in range but wrong.
- What you may notice
- Malfunction indicator lamp on
- EVAP tests suspended
- Likely causes
- LikelySignal wire of sensor B shorted to ground
- Possible5 V reference open or shorted
- 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.