C122E Diagnostic Trouble Code

C122E 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 C122E 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 :

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

Repair Processes :

Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition.

Process Tips

Diagnostic trouble code C122E 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 C122E.

Fortunately, C122E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C122E Trouble Code For Specific Cars

C122E Daihatsu Sportrak Glow Plug Monitor Fault (Bank #2)
C122E Fairthorpe Electrina Injector Circuit Malfunction - Cylinder 2
C122E Mercedes S Class Air Bag Crash Sensor #1 Ground Circuit Failure
C122E Aero Type 30 ABS Outlet Valve Coil LR Circuit Failure
C122E Hillman Imp PATS Is Disabled (Check Link Between PATS And Transponder)
C122E Toyota Sparky Passenger Air Bag Disable Module Fault
C122E Fiat 3.5 Lamp Adaptive Damping Warning Circuit Failure