P2402: EVAP System Leak Detection Pump Control Circuit High

P2402 points to the opposite fault of P2401: the pump control line sits at supply voltage or the pump draws too much current. GM's Volt tables call it a short to power detected while the driver is on; when it is active the ECM runs an intrusive check, running the pump for 15 s on command, with a Type B code after 20 failed samples out of 25. In VW's Golf data book of 2014 the limit is a pump current above 3.0 A or, on other engines, the voltage across the pump's current-measuring resistor (about 1.8-4.0 V). Acura recalled 2021-22 TLX Type S models (B22-007) because faulty PGM-FI software could keep the MIL on and P2402 stored after an ELCM circuit repair; Audi and Land Rover also publish P2402 cases. Driving is unaffected, but the evaporative leak check is skipped.

Low severity. Can I keep driving?Yes, you can normally keep driving. If there is a strong smell of gasoline, find the leak before continuing and do not smoke nearby.

Symptoms

Check engine light that may persist after repair until software is updated
EVAP readiness incomplete, inspection may fail

Most likely causes

Leak detection pump motor seized or drawing excessive current
Control wire shorted to a battery-voltage feed
Control module software that does not clear the fault after repair (Acura TLX Type S recall)

What to check, in order

Start with the simplest. You can tick off each step.

Start with the fuel cap: tighten it fully and check its seal
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Inspect the hoses and connections around the tank and the charcoal canister
Use the scanner to test the purge and vent solenoid valves
Run a smoke test to find small leaks

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P2402 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
4: Emissions
02: Specific fault in that system

Frequently asked questions

Can I keep driving with code P2402?

Yes, you can normally keep driving. If there is a strong smell of gasoline, find the leak before continuing and do not smoke nearby.

What causes code P2402?

The most common causes are: leak detection pump motor seized or drawing excessive current; control wire shorted to a battery-voltage feed; control module software that does not clear the fault after repair (Acura TLX Type S recall).

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.