C2779 Diagnostic Trouble Code

C2779 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 C2779 diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
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.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

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. 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 C2779 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 C2779.

Fortunately, C2779 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2779 Trouble Code For Specific Cars

C2779 Ford Mondeo 4 Mirror Driver/Passenger Switch Circuit Open
C2779 Hurtu Type X Rotor Sensor Fault
C2779 Brutsch V2n Cruise Control/Brake Switch A Circuit High
C2779 Fiat Argenta Lamp Headlamp High-Beam Circuit Failure
C2779 Cord 8 Fuel Sender Circuit Open
C2779 Renault Le Car Hazard Flash Output Circuit Short Battery
C2779 Cadillac Biarritz Damper RR Circuit Short to Ground