C2926 Diagnostic Trouble Code

C2926 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 C2926 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C2926 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 C2926.

Fortunately, C2926 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2926 Trouble Code For Specific Cars

C2926 Lada 117 Servo Motor Potentiometer Vent Circuit Short To Ground
C2926 Saab 9-2
C2926 Toyota Sera Park/Neutral Switch Circuit Open
C2926 Rover P5b Ignition Cylinder Sensor Battery Short
C2926 Mercedes-benz 240 Air Bag passenger Circuit Open - Loop #2
C2926 Nissan Otti Convertible Top Up/Down switch Fault
C2926 Toyota Mr2 Spyder Output Speed Sensor Intermittent