C0249 Diagnostic Trouble Code

C0249 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 C0249 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
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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 C0249 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 C0249.

Fortunately, C0249 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0249 Trouble Code For Specific Cars

C0249 Chevrolet Four Ninety Dual Alternator Battery Lamp Circuit Malfunction
C0249 Gmc Sonoma Park Brake Switch # 1 Released Circuit Short to Gnd
C0249 Pininfarina Osee EV Battery Pack Temperature Fault
C0249 Honda Quintet Rear Sounder Circuit Failure
C0249 Opel Omega Door Ajar RR Circuit Failure
C0249 Fiat 133 Knock Sensor 2 Circuit Range/Performance (Bank )
C0249 Jordan A Seat Front Up/Down Potentiometer Feedback Circuit Short To Ground