P1C8B Diagnostic Trouble Code

P1C8B is a kind of OBD-II Diagnostic P-Powertrain 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 P1C8B 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 :

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 you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs.

Process Tips

Diagnostic trouble code P1C8B 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 P1C8B.

Fortunately, P1C8B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1C8B Trouble Code For Specific Cars

P1C8B Suzuki Suzulight Mirror Driver Right Circuit Open
P1C8B Seat 127 Injector Circuit Malfunction - Cylinder 11
P1C8B Subaru Impreza Left Rear Center Sensor Circuit Fault
P1C8B Kia Visto Servo Motor Defrost Circuit Failure
P1C8B Kia Ceed Seat Recline Forward/Backward Potentiometer Feedback Circuit Short To Battery
P1C8B Bmw L Clutch Actuator Circuit High
P1C8B Alpine A310 Air Bag passenger Circuit Open - Loop #2