C0003 Diagnostic Trouble Code

C0003 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 C0003 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code C0003 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 C0003.

Fortunately, C0003 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0003 Trouble Code For Specific Cars

C0003 Audi Tt Audio Navigation Unit is Not Responding
C0003 Glas 3000 PAD Warning Lamp Inoperative
C0003 Alfa Romeo 1750 ABS Power Relay Output Circuit Failure
C0003 Buick 60 Cylinder 4 Injector Circuit High
C0003 Plymouth Trail Duster Exhaust Gas Recirculation Circuit Range/Performance
C0003 Ford Explorer Ii Memory 2 Switch Circuit Open
C0003 Sbarro Millenium Injection Pump Fuel Metering Control "A" Low (Cam/Rotor/Injector)