C0023 Diagnostic Trouble Code

C0023 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 C0023 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 :

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.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code C0023 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 C0023.

Fortunately, C0023 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0023 Trouble Code For Specific Cars

C0023 Fiat Punto Lamp Warning Relay Circuit Failure
C0023 Moretti 850 Blend Door Failure
C0023 Toyota Isis Oil Level Switch Circuit Short To Battery
C0023 Mercedes-benz 170 Air Bag Internal Diagnostic Monitor Fault or System Disarm Fault
C0023 Mercedes E Class Accelerometer Front Circuit Short To Ground
C0023 Fiat 501 Lamp Anti-Theft Indicator Circuit Open
C0023 Siata Coupe Intake Air Temperature Sensor 2 Circuit Range/Performance