C0122 Diagnostic Trouble Code

C0122 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 C0122 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 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 C0122 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 C0122.

Fortunately, C0122 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0122 Trouble Code For Specific Cars

C0122 Ferrari 342 Intake Air Temperature (IAT) Sensor Circuit Intermittent Low Voltage
C0122 Hyundai Trajet
C0122 Stoewer Stoewer Lamp Turn Signal Left Circuit Short To Battery
C0122 Cadillac V Disable Signal Open Circuit
C0122 Kia Sorento Secondary Air Injection System Switching Valve B Circuit Open
C0122 Suzuki Sc Mirror Driver Left Circuit Failure
C0122 Bmw Z4 Column Tilt Feedback Potentiometer Circuit Short to Battery