What Does P0540 Code Mean?

    OBD-II Code P0540 is defined as a Intake Air Heater "A" 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 P0540.

    P0540 Symptoms

    • Hard or no start in cold weather

    Common Problems That Trigger the P0540 Code

    • Intake air heater
    • Powertrain Control Module (PCM) failure
    • Wiring issue

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