P2405 OBD-II Trouble Code: EVAP Leak Detection Pump Control Circuit Low

P2405 code definition

Evaporative Emission Control System (EVAP) Leak Detection Pump Control Circuit Low

What the P2405 code means

P2405 is an OBD-II generic code for the Engine Control Module (ECM) detecting that the evaporative system leak detection pump control circuit has a low voltage signal return.

What causes the P2405 code?

• The ECM monitors the evaporative control system pump current. If the current goes lower than specified then the code is set.

• The EVAP system pump is drawing too little amps or an open circuit in the power circuit.

• The system to control the pump motor has a shorted wire harness causing low return voltage.

What are the symptoms of the P2405 code?

• The Check Engine Light will be illuminated and the code is set in the 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 P2405 code?

• Try to scan for codes and document the codes in the ECM and look at the freeze frame data for the problem before clearing the codes and retesting.

• Test the pump connector for issues causing an opening in the wiring.

• Test the resistance of the pump and check its specification.

• Test wiring for open circuits between the power supply and pump.

Common mistakes when diagnosing the P2405 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 verify the failure before replacing the parts.

How serious is the P2405 code?

Code P2405 is an indication that the evaporative pump is open internally. Other than failing the emission test and the check engine light being on, this code should not cause any drivability problems.

What repairs can fix the P2405 code?

• Replace the EVAP pump and fuse if it got blown.

• Repair the EVAP pump connector pins for corrosion, melted or loose connections causing the open circuit.

• Replace the EVAP pump relay if it has an open coil.

Additional comments for consideration regarding the P2405 code

Code P2405 is for the EVAP pump not drawing enough amperage as specified. This is common on higher mileage vehicles after the pump is worn out or if the pump relay contact shorts and running the motor continuously will burn the pump out. Test for this when replacing the bad pump.

Need help with a P2405 code?

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