C0268 Diagnostic Trouble Code

C0268 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 C0268 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
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

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 all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code C0268 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 C0268.

Fortunately, C0268 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0268 Trouble Code For Specific Cars

C0268 Chevrolet Corvette C5 Driver Sliding Door Ajar Circuit Short to GND
C0268 Chenard Walcker Tank Door Unlock Disarm Switch Circuit Open
C0268 Gmc Terradyne Park Brake Valve Solenoid #1 Sense Input Circuit Failure
C0268 Mitsubishi Gaus Autolamp Delay Increase Circuit Short To Ground
C0268 Fiat 10-12 Kickdown Hold Relay Open or Short Circuit to Ground
C0268 Marcos Mantula Transmission 4-Wheel Drive High Indicator Circuit Failure
C0268 Volkswagen Schwimmwagen SAI System Monitor Circuit High Input