C2966 Diagnostic Trouble Code

C2966 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 C2966 diagnostic trouble code may include:

Malfunction Indicator Lamp (MIL) illuminated
Carbon Buildup on O2 Sensor
Poor fuel economy
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

Fuel with a large percentage of sulfur will clog the DPF quickly
The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code C2966 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 C2966.

Fortunately, C2966 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2966 Trouble Code For Specific Cars

C2966 Gm Ev1 Park / Neutral Switch Input Circuit High
C2966 Acura Tl Iv ABS Inlet Valve Coil Rear Circuit Failure
C2966 Nissan Terrano Cylinder #1 High To Low Side Short
C2966 Overland 38 Door Unlock Disarm Switch Circuit Short To Ground
C2966 Simca 6 Intake Valve Control Solenoid Circuit Range/Performance (Bank 1)
C2966 Aymesa Gala Aux Heater Start Counter Overrun/System Locked (same as below ?)
C2966 Alfa Romeo 2300 ABS Valve Power Relay Circuit Failure