C3003 Diagnostic Trouble Code

C3003 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 C3003 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code C3003 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 C3003.

Fortunately, C3003 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3003 Trouble Code For Specific Cars

C3003 Packard Super Driver Door Handle Circuit Open
C3003 Tata Sumo Mirror Passenger Vertical Switch Circuit Open
C3003 Saab 9.5 Ii Ignition Run/Acc Circuit Short To Ground
C3003 Holden Vt Pressure Control Solenoid "B" Short Circuit
C3003 Steyr Haflinger Lamp Tail Output Circuit Short To Ground
C3003 Ballot 2-litre B Camshaft Position - Actuator Circuit (Bank1)
C3003 Mercedes-benz 260 Air Bag Passenger Circuit Short To Battery