U0268 Diagnostic Trouble Code

U0268 is a kind of OBD-II Diagnostic U-Network 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 U0268 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 :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 U0268 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 U0268.

Fortunately, U0268 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0268 Trouble Code For Specific Cars

U0268 Farboud Gts Injector Circuit Open / Shorted - Cylinder #3
U0268 Vale 1100 Power Window LR Motor Circuit Short To Ground
U0268 Holden Rodeo Power To Fan Circuit Overcurrent
U0268 De Dion Bouton 18 HO2S Heater Resistance (Bank 1 Sensor 3)
U0268 Mg 14 Air Suspension RR Air Compress Request Exceeded Max Timing
U0268 Adams 16 ABS Inlet Valve Coil Rear Circuit Short To Ground
U0268 Cadillac Dts Decklid Punch-Out Sensor Circuit Failure