C0231 Diagnostic Trouble Code

C0231 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 C0231 diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

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)
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code C0231 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 C0231.

Fortunately, C0231 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0231 Trouble Code For Specific Cars

C0231 Ford Freestyle Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Battery
C0231 Citroen Xantia Fuel Rail Pressure Sensor Circuit Low Input
C0231 Graham Streak Passenger Power Window Motor Circuit Open
C0231 Zagato Hyena
C0231 Lancia Gamma Speed Wheel Sensor RF Circuit Open
C0231 Maserati Auge Transmission Fluid Pressure Sensor/Switch B Circuit Low
C0231 Talbot Horizon Mirror Passenger Horizontal Switch Circuit Open