P1C9B Diagnostic Trouble Code

P1C9B 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 P1C9B diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

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. 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. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code P1C9B 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 P1C9B.

Fortunately, P1C9B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1C9B Trouble Code For Specific Cars

P1C9B Ford Sierra Mirror Passenger Right Circuit Open
P1C9B Dodge T-rex Ignition Tach Circuit Open
P1C9B Iveco Daily 35s18 Seat Direction Switch Assembly Circuit Open
P1C9B Simca Vedette Beaulieu Intermediate Speed Sensor (ISS) Malfunction
P1C9B Ford Versailles Module Supply Voltage Out Of Range
P1C9B Fiat Scudo Ii Lateral Accelerometer Sensor Circuit Open
P1C9B Peugeot Partner Iii Engine Coolant Temperature (ECT) Sensor Circuit Intermittent Low Voltage/IAT - B Circuit Low Input