P268C Diagnostic Trouble Code

P268C is a kind of OBD-II Diagnostic P-Powertrain 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 P268C 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
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
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 :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 P268C 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 P268C.

Fortunately, P268C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P268C Trouble Code For Specific Cars

P268C Talbot 25 Mirror Passenger Horizontal Feedback Potentiometer Circuit Failure
P268C Mazda 616 Transmission Transfer Case Contact Plate 'D' Open Circuit
P268C Maserati 3500 Transmission Control System Malfunction
P268C Volvo Xc70 Ii SCP (J1850) Invalid or Missing Data for Function Read Engine Torque
P268C Alfa Romeo Rz Air Bag Crash Sensor #2 Feed/Return Circuit Failure
P268C Oldsmobile Achieva Cylinder 6 Contribution/Balance Fault
P268C Seat Cordoba 2 Injector Circuit Open / Shorted - Cylinder #5