P0640Powertrain (P)generic
Intake Air Heater Control Circuit
The computer detected a malfunction in the circuit controlling the intake air heater, which warms incoming air for cold-start conditions. The heater element, relay, wiring, or control circuit is faulty or disconnected. Cold starts may be difficult or impossible in freezing temperatures, and the vehicle could stall or run very rough until the engine warms up.
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