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OBD II Fault Code

  • OBD II P2688

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Fuel Supply Heater Control Circuit Low

    The Fuel Supply Heater keeps the fuel above freezing. If the Fuel Supply Heater fails to operate as requested, code P2688 will be stored.

    Common Problems That Trigger the P2688 Code

    • Fuel supply heater failure
    • Fuel supply heater relay failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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