P2400: EVAP leak detection pump control circuit open or faulty
The ECU cannot properly control the pump that checks the fuel vapour system for leaks. Usually a wire, connector or the pump itself is at fault.
| Code | P2400 |
|---|---|
| System | Engine and transmission |
| Group | P24xx, EGR, EVAP and particulate filter |
| Type | Generic: it means the same on every make |
| Can you keep driving? | Yes, no rush |
What P2400 means
The EVAP system collects fuel vapour from the tank so it does not escape into the air. Some cars use a small pump to pressurise that system and check it for leaks. The ECU has found an open circuit or electrical fault in the pump’s control line.
Most common causes
- Leak detection pump connector loose or corroded
- Broken or damaged wire between pump and ECU
- Blown fuse or poor supply to the pump
- Faulty leak detection pump
- ECU fault (uncommon)
Symptoms
- Engine warning light on
- Usually no change in how the car drives
- May fail the emissions part of the inspection
Can you drive with P2400?
Yes, no rush It does not affect how the car drives. You can keep using it normally and fix it when convenient, though it may fail an inspection.
Open the bonnetthe in-depth explanation
How to check it
The pump usually sits near the fuel tank or charcoal canister underneath the rear of the car. Check its connector is fully seated and clean, as it collects road dirt and water.
How to read and clear P2400 with Final OBD
Plug an OBD2 scanner in under the steering wheel, switch the ignition on and open Final OBD. Under Faults you’ll see P2400 with its description and whether it’s confirmed, pending or permanent.
If the engine stores it over standard OBD, with FREE you read this code with its explanation for nothing and clear it. With PRO you also read the faults of every control unit and clear them in all of them.
Clearing the code only turns the light off: if the cause is still there, it comes back. Clear it once it’s fixed, and not right before an inspection. It’s all in how to read and clear fault codes and in inspections and OBD.
Similar codes
- P2401 The control of the fuel vapour leak detection pump gives a lower signal than
- P2402 The control of the fuel vapour leak detection pump gives a higher signal than
- P2403 The signal of the fuel vapour leak detection pump has a broken or disconnected
- P2404 The signal of the fuel vapour leak detection pump gives readings outside the
- P2413 Exhaust gas recirculation (EGR) system performance
- P2414 O2 sensor exhaust sample error (bank 1, sensor 1)
- P2425 EGR cooler valve control circuit open or faulty
- P242F Diesel particulate filter restriction: ash accumulation
What does code P2400 mean?
The EVAP system collects fuel vapour from the tank so it does not escape into the air. Some cars use a small pump to pressurise that system and check it for leaks. The ECU has found an open circuit or electrical fault in the pump’s control line.
Can you drive with P2400?
It does not affect how the car drives. You can keep using it normally and fix it when convenient, though it may fail an inspection.
How do you clear P2400?
With an OBD2 scanner and an app like Final OBD, which clears it for free if it’s stored by the engine control unit. But clearing it only turns the light off: if the cause isn’t fixed, P2400 comes back.
Read it on your car
Final OBD reads and clears engine faults through standard OBD for free, each one explained in plain English. With PRO it also reads the faults of every control unit, each make’s own codes included, and clears them in all of them.
