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OBD II Fault Code

  • OBD II P0640

    OBD-II Code Hard or no start in cold weather is defined as a Intake Air Heater Control Circuit

    The Intake Air Heater warms the air going into the engine on cold startups. If the engine control module (PCM) detects a failure in the Intake Air Heater or its wiring, it will set code P0640.

    Hard or no start in cold weather Symptoms

    • Hard or no start in cold weather

    Common Problems That Trigger the P0640 Code

    • Faulty intake air heater relay
    • Glow plug control module failure
    • Intake air heater
    • Powertrain Control Module (PCM) failure
    • Wiring issue

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