C2679 Diagnostic Trouble Code

C2679 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 C2679 diagnostic trouble code may include:

Fuel pressure too high
Diminished fuel efficiency
Rich or lean exhaust
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
Faulty IMRC actuator relay (if equipped)

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C2679 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 C2679.

Fortunately, C2679 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2679 Trouble Code For Specific Cars

C2679 Chevrolet Utility Engine Coolant Sensor intermittent/ECT Sensor Intermittent
C2679 Opel Astra H DC-DC Converter Failure
C2679 Denzel Sport Hydraulic Pump Relay Circuit / Open
C2679 Mercedes B 160 ABS Hydraulic Pressure Differential Switch Input Open Circuit
C2679 Volvo 262
C2679 Bentley T Blower (Fan) Circuit Short to Vbatt
C2679 Pontiac 6000 Exhaust Pressure Control Valve High