C3768 Diagnostic Trouble Code

C3768 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 C3768 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 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.

Process Tips

Diagnostic trouble code C3768 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 C3768.

Fortunately, C3768 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3768 Trouble Code For Specific Cars

C3768 Mercedes Sl 60 Air Bag Crash Sensor #2 Ground Circuit Failure
C3768 Citroen 15cv Fan Secondary Low with Low Fan On
C3768 Simca Horizon Interior Fan Control Circuit Short to Ground
C3768 Toyota Opa Overdrive Band Failed Off
C3768 Dellow Mark Hydraulic Pressure Unit Cycling Period Too Short
C3768 Marcos Mantis Transmission 4-Wheel Drive Clutch Relay Open Circuit
C3768 Dodge Super 8 Ignition Tach Circuit Failure