P0640

DTC P0640, sometimes indicated as P064000 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the causing intake air heater control circuit.

The P0640 code means that the intake air heater control circuit is not working properly. This could be due to a wiring issue, a bad intake air heater, or a problem with the control circuit.
If you have a wiring issue, the best solution is to have a qualified technician inspect and fix the problem. If you have a bad intake air heater, the only solution is to replace it. If you have a problem with the control circuit, you may be able to fix it by replacing the control module.

• P0640: Intake Air Heater Control Circuit
• P0640: Intake air heater control – circuit malfunction
• P0640 00: Intake air heater control - circuit malfunction

These codes are commonly diagnosed with error code P0640.

• P0230 [1] Fuel Pump Primary Circuit Malfunction
• P0670 [1] Glow Plug Module Control Circuit
• P1690 [1] Metering Oil Pump Stepping Motor Circuit Malfunction
• P1662 [1] Power Steering Output Circuit Malfunction