OBD Code P0640

Intake Air Heater Control Circuit

What’s mean?

OBD2 Code P0640 Definition:
The intake air (IA) heater is located in the air inlet tube and is used to warm the incoming air to aid in starting the engine and for proper cylinder combustion. The glow plug control module (GPCM) will command the IA heater ON when the engine coolant temperature is below 40 C (104 F). The power to the IA heater is supplied by the battery positive voltage circuit.

Symptoms

Possible sumptoms of P0640
– Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

Possible causes of P0640
– Intake Air Heater circuit – Faulty Intake Air Heater

Possible Solutions