P0640 OBD II Trouble Code Intake Air Heater Control Circuit

How to easily diagnose, repair, and info on causes of a P0640 trouble code that indicates a detected failure of the intake air heater control circuit.

Symptoms of P0640 OBD II Trouble Code

Diminished fuel efficiency
Rough idle on cold start
Drivability issues when cold
Other IAT codes

Common Causes of P0640 OBD II Trouble Code

Defective or disconnected intake air temperature sensor
Faulty intake air heater relay or fuse
Shorted or open wiring or connectors
Burnt out intake air heater element
Bad PCM or programming error

Severity of P0640 OBD II Trouble Code

Intake air temperature codes should be classified as severe and addressed as such. A code P0640 may be accompanied by various drivability symptoms, especially when the engine is cold.

P0000 OBD II Trouble Code No Diagnostic Trouble Codes Found

P0001 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit/Open

P0002 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0003 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0004 OBD II Trouble Code DTC Fuel Volume Regulator Control Circuit Range/Performance

P0005 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit/Open

P0006 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit Low

P0007 OBD II Trouble Code DTC Fuel Shutoff Valve A Control Circuit High

P0008 OBD II Trouble Code Engine Positions System Performance Bank 1

P0009 OBD II Trouble Code Engine Positions System Performance Bank 2

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