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P2406 is a diagnostic trouble code (DTC) for "Evaporative Emission System Leak Detection Pump Sense Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
EVAP Leak Detection Pump Sense Circuit High
P2406 is an OBD-II code that signals the engine control module (ECM) has detected a malfunction with the EVAP leak detection pump sense circuit and is getting a high voltage return indicating a short to power in the sensor or circuit.
The ECM has detected a short in the circuit of the EVAP pump sense circuit.
The cause of code P2406 can be a leak detection pump short circuit or the connector corroded causing shorted contacts in the connector.
The code can also be set if the wiring to the valve is damaged between the ECM and the pump sense circuit.
The Check Engine Light will be illuminated and the code is set in ECM memory.
You may notice a slight drop in fuel mileage if the vapor system is not working or has a leak to atmosphere.
You may smell gasoline fumes if there is a fuel vapor leak that cannot be detected due to this failure.
Scans codes and documents the code in the ECM. Views the freeze frame data to see when the fault happened
Inspects the entire EVAP wiring and system to include the pump connector for corrosion, damage, or loose connection or wires
Checks pump sense circuit for shorts in the circuit following pinpoint tests
Checks the EVAP pump for proper resistance of the pump and then checks operation of the pump using the ECM to control the pump to see if the pump or pump sense circuit is causing the failure
Assuming the EVAP pump is defective without doing a thorough diagnostic of the complete system to later find the wiring is shorted
Failing to verify the failure and replacing parts that may or may not be the problem
Not confirming repair is complete and then clearing codes
Testing and replacing the EVAP leak pump
Repairing the damaged wiring to the EVAP leak detection pump and securing the harness from getting damaged again
Clearing codes and verifying operation of the EVAP system
Code P2406 is a failure of the EVAP system leak detection pump that in most cases will only run after the engine is shut off and has had a time delay set in the computer for a run of the pump. Running the test manually can be done using a scanner to actuate the pump and checking the sense circuit before and after the repairs have been made.
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