C0639 Diagnostic Trouble Code

C0639 is a kind of OBD-II Diagnostic C-Chassis Diagnostic Trouble Code.

It is considered generic because it applies to all makes and models of vehicles, although specific repair steps may be different depending on your car model.

Symptoms

Symptoms of a C0639 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code C0639 is not difficult to diagnose and repair. Thus, it always pays to have a qualified technician to look after your vehicle should this error code arise.

Diagnosing this code requires the engine to be in good running shape, without unmetered air entering the engine. If other codes that relates to misfiring condition, lean running or air entering the engine is present, then you must first fix those error codes before C0639.

Fortunately, C0639 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0639 Trouble Code For Specific Cars

C0639 Tornado Typhoon Motor Relay # 1 Circuit Short to Battery
C0639 Osca 1600 Door Passenger Reset Switch Stuck Failure
C0639 Qvale Mangusta Fuel Temperature Sensor #2 Circuit Short to Battery
C0639 Porsche 928 Fuel Delivery System Malfunction - Low
C0639 Lexington 6-50 TCM Power Input Signal
C0639 Holden Maloo Power Supply #1 Circuit Short to Ground
C0639 Proto Spirra Fuel Restriction Condition