C2499 Diagnostic Trouble Code

C2499 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 C2499 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
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.
Faulty IMRC actuator/sensor

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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. If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code C2499 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 C2499.

Fortunately, C2499 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2499 Trouble Code For Specific Cars

C2499 Volvo Volvo
C2499 Pontiac Montana Fan Relay (High) Circuit Malfunction
C2499 Mercedes E 250 ABS Power Relay Output Circuit Failure
C2499 Lancia Ypsilon Ii Steering Angle Sensor Circuit Open
C2499 Hyundai Lantra SCP (J1850) Invalid or Missing Data for Class A Functions
C2499 Stutz E4 Lateral Accelerometer circuit Failure
C2499 Kaiser Six Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Short To Ground