C2103 Diagnostic Trouble Code

C2103 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 C2103 diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

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)
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

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. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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 C2103 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 C2103.

Fortunately, C2103 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2103 Trouble Code For Specific Cars

C2103 Chrysler Town Exhaust Pressure Control Valve Intermittent
C2103 Isuzu Frontera SCP (J1850) Invalid or Missing Data for Throttle
C2103 Hyundai Sonata 6 SCP (J1850) Invalid or Missing Data for Electric Defrost
C2103 Porsche 996 Fuel Level Sensor Circuit Range/Performance
C2103 Mazda 121 Transmission Transfer Case Contact Plate 'A' Short Circuit To Battery
C2103 Italdesign Tapiro SCP (J1850) Single Ended (+) Circuit Failure
C2103 Honda Acura Tsx Pressure Control Solenoid C Control Circuit High