C101C Diagnostic Trouble Code

C101C 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 C101C diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Defective ECU strategies or components will prevent proper regeneration

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. Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness.

Process Tips

Diagnostic trouble code C101C 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 C101C.

Fortunately, C101C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C101C Trouble Code For Specific Cars

C101C Tommy Kaira Motor # 1 Input Circuit Short to Gnd
C101C Subaru 1400 Lateral Accelerometer Sensor Circuit Open
C101C Kia Joice Seat Switch Reference Voltage Positive Common Supply Low Voltage
C101C Ferrari 735 Intake Valve Control Solenoid Circuit Low (Bank 2)
C101C Buick Lucerne Cylinder 8 Misfire Detected
C101C Ferrari 412 Intake Air Temperature Sensor 2 Circuit Range/Performance
C101C Cisitalia 1250 Exhaust Valve Control Solenoid Circuit (Bank 2)