P24D7 code meaning
EVAP System Pressure Sensor/Switch B Circuit Low
Powertrain system Generic code P24xx codes Check engine light
What P24D7 means
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.
P24D7 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P24D7
- Malfunction indicator lamp on
- EVAP tests suspended
Common causes of P24D7
- Most likelySignal wire of sensor B shorted to ground
- Possible5 V reference open or shorted
- PossibleEVAP pressure sensor B failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP pressure sensor b
What each part of P24D7 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| D7 | The exact fault in that area. |
What to do next
- Note P24D7 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P24D7
What does P24D7 mean?
P24D7 means "EVAP System Pressure Sensor/Switch B Circuit Low". P24D7 is set when EVAP pressure sensor B sends a voltage below its valid window. It is a generic code, so it means the same on every make.
Is it safe to drive with P24D7?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P24D7 fail an emissions test?
Yes, it can. P24D7 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P24D7 to fix?
Difficulty: medium. A typical repair takes 0.5 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P24D7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.