P320C Diagnostic Trouble Code

P320C is a kind of OBD-II Diagnostic P-Powertrain 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 P320C diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
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
Defective ECU strategies or components will prevent proper regeneration

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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code P320C 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 P320C.

Fortunately, P320C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P320C Trouble Code For Specific Cars

P320C Opel Signum Door Driver Key Cylinder Switch Failure
P320C Volkswagen Voyage
P320C Honda Accord Pressure Control Solenoid A Control Circuit Range/Performance
P320C Lada Vaz 2107 Shift Solenoid C Intermittent
P320C Glas 1304 Overdrive Band Failed Off
P320C Aston Martin V12 Vanquish Air Suspension Warning Lamp Circuit Open
P320C Lotus 49 Torque Converter Clutch System Performance