P2402

EVAP System Leak Detection Pump Control Circuit High

EVAP (emissions) Generic OBD-II Low

What it means

P2402 means the ECM sees high voltage (an open or short to power) in the control circuit for the EVAP leak detection pump — the pump the system uses to pressurize and check the fuel-vapor system for leaks. It's an electrical fault, not a running problem, so the car drives normally but can't complete its EVAP leak test and won't pass emissions until the circuit is repaired.

Low

Can I keep driving? Yes — this is an emissions-monitoring fault; the car runs and drives normally but will fail an emissions test until fixed.

Real-world scan data

Seen in

380

scans in the past year

Found in

0.1%

of scans

0.1%

of scans that found faults

Appears alongside · share of P2402 scans

P2401in 75.3% of scans

P043Fin 73.2% of scans

P2419in 72.1% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
No change in how the car drives
May fail an emissions/smog test
EVAP leak monitor won't complete

Common causes

Most likely first

Open or short-to-voltage in the leak detection pump control circuit wiringLikely
Corroded or loose connector at the leak detection pumpCommon
Faulty EVAP leak detection pumpCommon
Faulty ECM/PCM (least likely)Less often

How to diagnose & fix

Work through it in order

Scan and confirm P2402 and check freeze-frame data.
Inspect the leak detection pump connector and control wiring for an open or short to power.
Measure the pump's resistance against spec.
Check the ECM control circuit and grounds.
Replace the leak detection pump if it fails, then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P2402?+

Yes. This is an electrical fault in the EVAP leak-detection pump circuit — it doesn't affect how the car runs. It will, however, fail an emissions test and keep the check-engine light on.

Can I just clear P2402?+

It returns once the circuit fault is detected again. Repair the wiring or pump rather than clearing it.

Read & clear P2402 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX