C0236 Diagnostic Trouble Code

C0236 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 C0236 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 :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
An air leak forward of the DPF will change the sensor readings resulting in the code

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. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. 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.

Process Tips

Diagnostic trouble code C0236 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 C0236.

Fortunately, C0236 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0236 Trouble Code For Specific Cars

C0236 Mercury Sable Air Suspension Reservoir Pneumatic Failure
C0236 Sunbeam Rapier Manually Shifted Automatic (MSA) Sw Circuit Malf
C0236 Nissan Kubistar Code Word Unregestered
C0236 Toyota 700 No Communication With Traffic MasterModule
C0236 Opel Grandland X Dim Panel Increase Input Circuit Open
C0236 Alfa Romeo 146 ABS Outlet Valve Coil RF Circuit Short To Battery
C0236 Mercedes Cla 45 ABS Outlet Valve Coil LF Circuit Failure