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P2402 OBD-II Trouble Code: EVAP Leak Detection Pump Control Circuit High

Check Engine Light

What the P2402 code means?

P2402 is an OBD-II generic code for the engine control module (ECM) detecting the evaporative system leak detection pump control circuit has a high voltage signal return.

What causes the P2402 code?

  • The ECM monitors the EVAP control system pump current and if the current goes higher than specified then the code is set.

  • The evaporative system pump drawing too many amps or high resistance in the power circuit.

  • The system to control the pump motor has a shorted wire harness.

What are the symptoms of the P2402 code?

  • The Check Engine light will be illuminated and the code is set in ECM memory as a fault.

  • The vehicle will not run any different in most cases.

  • The vehicle may have a blown circuit fuse to the pump power relay.

  • The vehicle will fail emission testing.

How does a mechanic diagnose the P2402 code?

  • Scans for codes and documents the code in the ECM and looks at the freeze frame data for the problem before clearing the codes and retesting.

  • Tests the pump connector for issues causing a short of the wiring.

  • Tests the resistance of the pump and check specifications.

  • Tests wiring for shorts between power supply and the pump/

Common mistakes when diagnosing the P2402 code?

  • Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired

  • Failing to clear the ECM codes after the codes are fixed

  • Failing to replace the burned out fuse after the pump is replaced

How serious is the P2402 code?

Code P2402 is an indication that the evaporative pump is shorted internally and other than failing emission tests and the check engine light being on, should not cause any drivability problems.

What repairs can fix the P2402 code?

  • Replace the evaporative pump and fuse.
  • Replace the evaporative pump relay.
  • Repair the evaporative pump connector pins for corrosion, melted, or loose connections.

Additional comments for consideration regarding the P2402 code

Code P2402 for the evaporative pump is drawing more amps than specified. This is common on higher mileage vehicles after the pump has gotten worn or if the pump relay sticks on and runs the motor continuously until the pump burns out. Test for this when replacing the bad pump.

Need help with a P2402 code?

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The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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