P2400

Evaporative Emission System Leak Detection Pump Control Circuit/Open

Car Fault Codes Emissions & exhaust

Can you still drive? Yes, normally

Who can fix it? Needs a workshop

Typical repair time 30 minutes – 2 hours

Typical cost SAR 100 to 1,000

What it means

Some vehicles use a small leak detection pump (LDP) that pressurizes the evaporative emission (EVAP) system to test it for leaks. The engine computer found that the pump control circuit is open or not responding as expected, so it cannot run the leak test.

Symptoms4

Check engine light on.
EVAP self-tests do not complete.
Failed emissions test.
Usually no change in how the engine runs.

Possible causes5

Open circuit in the pump control or supply wire.
Loose or corroded connector, since the pump is often near the fuel tank or charcoal canister and exposed to dust and moisture.
Failed pump coil or internal solenoid.
Blown fuse in the supply circuit.
Engine computer fault (rare).

How to diagnose5

Locate the leak detection pump in the service information and inspect its connector and wiring.
Check the fuse for the supply circuit.
Use a scan tool to command the pump on and listen for it working.
Measure supply voltage and pump coil resistance against the manufacturer specification.
Check continuity of the control wire between the pump and the computer.

How to fix4

Replace the blown fuse after confirming there is no short.
Clean the connector and repair the broken wire.
Replace the leak detection pump if its coil is open or it does not work.
Clear the codes and drive until the EVAP tests complete.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a wire, connector or fuse repair, and reaches the upper end when the leak detection pump is replaced.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Does this code affect the engine?

Usually not. It concerns the EVAP leak test system, but it prevents passing an emissions test and hides any real leak that may develop.

Why do this pump's connectors fail so often?

It is usually mounted under the car near the tank or charcoal canister, where dust, water and heat corrode the terminals over time.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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