C2999 Diagnostic Trouble Code

C2999 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 C2999 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
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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. 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.

Process Tips

Diagnostic trouble code C2999 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 C2999.

Fortunately, C2999 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C2999 Trouble Code For Specific Cars

C2999 Daimler Daimler Headlamp Aim Output Relay Circuit Failure
C2999 Buick 2235 Cylinder 3 Contribution/Balance Fault
C2999 Mitsubishi Pistachio Aux Heater Coolant Sensor Circuit Open
C2999 Opel Ampera-e Damper RR Circuit Open
C2999 Jowett Jupiter Seat Headrest Feedback Potentiometer Circuit Short to Ground
C2999 Claveau Descartes Fuel Rail/System Pressure - Too Low
C2999 Vauxhall Astra J PRC Solenoid Circuit Malfunction