P2400 code meaning
EVAP System Leak Detection Pump Control Circuit/Open
Powertrain system Generic code P24xx codes Check engine light
What P2400 means
P2400 is stored when the engine computer finds the drive line of the evaporative leak detection pump open, so the pump cannot be switched for the tank leak test. GM's tables for the sealed fuel system of the Volt (2011, 2016) compare the commanded and actual driver state and treat a low voltage in the off state, equal to more than 200 kOhm to ground, as an open; 20 failed samples out of 25 at 250 ms each set a Type B code. VW's 2014 Golf data book flags a signal voltage of roughly 4.4-5.6 V. Toyota names P2400 with failure types 7E/7F on A25A engines, and VW traced P2400 on the 2011-2014 Touareg 3.6 to coolant entering the pump's vacuum line. P2401 and P2402 are the short-circuit siblings. The leak test cannot run; the car drives normally.
P2400 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of P2400
- Check engine light
- EVAP readiness monitor stays incomplete
- No noticeable change in driving behaviour
Common causes of P2400
- Most likelyCorroded or loose pump connector, broken wire in the drive line
- PossibleOpen winding or internal fault in the leak detection pump
- Less likelyCoolant in the pump's vacuum supply line from a failed coolant pump changeover valve (VW Touareg 3.6)
- Less likelyFaulty output stage in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EVAP leak detection pumpEVAP pump wiring
What each part of P2400 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). |
| 00 | The exact fault in that area. |
What to do next
- Note P2400 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 P2400
What does P2400 mean?
P2400 means "EVAP System Leak Detection Pump Control Circuit/Open". P2400 is stored when the engine computer finds the drive line of the evaporative leak detection pump open, so the pump cannot be switched for the tank leak test. It is a generic code, so it means the same on every make.
Is it safe to drive with P2400?
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 P2400 fail an emissions test?
Yes, it can. P2400 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 P2400 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2400 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.