P2401

Evaporative Emission System Leak Detection Pump Control Circuit Low

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

The engine computer found that the voltage in the control circuit of the EVAP leak detection pump (LDP) is lower than expected. This usually means the control wire is shorted to ground or the pump has an internal fault.

Symptoms4

Check engine light on.
EVAP self-tests do not complete.
Failed emissions test.
Usually no noticeable change in engine performance.

Possible causes5

Control wire shorted to ground or to the body from chafed insulation.
Internal short in the pump coil.
Moisture or corrosion inside the connector.
Low supply voltage to the pump from a bad fuse or wire.
Control circuit fault inside the engine computer (rare).

How to diagnose5

Inspect the pump wiring under the car for torn insulation or rubbing on the body.
Unplug the pump and see whether the code status or circuit reading on the scan tool changes.
Measure pump coil resistance against the manufacturer specification; very low resistance means an internal short.
Check the control wire for a short to ground.
Verify supply voltage and the fuse.

How to fix4

Repair the chafed insulation or grounded wire and secure it away from rubbing points.
Clean and dry the connector, or replace it.
Replace the leak detection pump if its coil is shorted.
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 when a wire or connector is at fault, and reaches the upper end when the 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

Can this short damage the engine computer?

A lasting short can stress the control circuit inside the computer, so repair the wire or pump as soon as possible.

Does the pump always need replacing?

No. The cause is often a wire rubbing on the body under the car, so check the wiring first.

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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