Is It Safe to Drive With a P2400 Code?
Common Symptoms of a P2400 Fault
EML on
No driveability issues
EVAP system cannot self-test for leaks
Possible Causes of P2400
A P2400 code can be triggered by faults across several systems. Identifying the exact root cause requires proper diagnostic equipment and live data — not just reading the code.
Leak Detection Pump Wiring Fault
Wiring to the EVAP leak detection pump is open.
Leak Detection Pump Failure
The pump itself has failed electrically.
Fuse Failure
Fuse protecting the pump circuit has blown.
ECU Output Fault
ECU output controlling the pump has failed.
Why we don't list the exact part: A P2400 code tells you what's happening but not why. Replacing parts based on the code alone is the most common way drivers waste money. A proper diagnosis identifies the specific cause first.
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P2400 and Your MOT
A stored P2400 fault code will cause your car to fail its MOT. The engine management light will be illuminated during the test — an automatic failure under current MOT standards. Even if the light temporarily clears, the code remains in ECU memory and can be read by testers.
Get the fault diagnosed and repaired first, then have the code cleared and confirm the light stays off before booking your MOT.