B0268 Diagnostic Trouble Code

B0268 is a kind of OBD-II Diagnostic B-Body 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 B0268 diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Defective ECU strategies or components will prevent proper regeneration

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. 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.

Process Tips

Diagnostic trouble code B0268 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 B0268.

Fortunately, B0268 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0268 Trouble Code For Specific Cars

B0268 Austin-healey Sport Aux A/C Mode Position Reference Circuit Short to Ground
B0268 Wendax Ws
B0268 Audi S3 Audio CD/DJ Internal Fault
B0268 Talbot 1510 Mirror Passenger Drive Circuit Failure
B0268 Lotus Carlton Torque Converter/Brake Switch B Circuit Malfunction
B0268 Alvis Ta Air Flow Recirculation Door Driver Circuit Failure
B0268 Austin A135 Autolamp Delay Decrease Circuit Short To Battery