C0237 Diagnostic Trouble Code

C0237 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 C0237 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

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.
Dirty air cleaner element Damaged DPF

Repair Processes :

If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve. 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. 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 C0237 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 C0237.

Fortunately, C0237 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0237 Trouble Code For Specific Cars

C0237 Subaru B9 Left Front Center Sensor Circuit Failure
C0237 Ford Maverick Mirror Driver Vertical Feedback Potentiometer Circuit Failure
C0237 Radical Sr3 Fuel Temperature Sensor #2 Circuit Short to Ground
C0237 Mitsubishi Gto Autolamp On Circuit Open
C0237 Land Rover Discovery Steering Column Switch Circuit Out of Range
C0237 Subaru 1600 Lateral Accelerometer Signal Fault
C0237 Pontiac Grand Safari Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)