C0239 Diagnostic Trouble Code

C0239 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 C0239 diagnostic trouble code may include:

Cherry red hot catalytic converter
Poor acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Reduction in engine performance, especially at low RPM levels

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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code C0239 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 C0239.

Fortunately, C0239 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0239 Trouble Code For Specific Cars

C0239 Bristol 410 Crankshaft Position Camshaft Position Correlation (Bank 1 Sensor B)
C0239 Opel Concept Decklid Release Circuit Failure
C0239 Acura Rsx ABS Inlet Valve Coil LR Circuit Failure
C0239 Cadillac 50 Damper LR Circuit Short to Ground
C0239 Chevrolet Express Driver's Seat Seatback Autoglide Rearward Switch Circuit Short to Ground
C0239 Holden Omega Power Supply Sensor Circuit Open
C0239 Mazda Taiki A/C Evaporator Air Temperature Circuit High