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Our automotive experts have put together the following information about the P2420 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2420 code.

OBD II Fault Code

  • OBD II P2420

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Evaporative Emission System Switching Valve Control Circuit High

    The Leak Detection Pump is part of the Evaporative Emissions System. After the vehicle has been sitting for a few hours, this pump will turn on and create a vacuum in the EVAP system. The engine computer (PCM) runs this test when the vehicle is off. If the PCM does not see the Leak Detection Pump activate as requested, or does not see a vacuum created in the EVAP System, the PCM will set code P2420.

    Common Problems That Trigger the P2420 Code

    • Canister pump module failure
    • Leaking or restricted evap hose
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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