C0293 Diagnostic Trouble Code

C0293 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 C0293 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
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.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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.

Process Tips

Diagnostic trouble code C0293 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 C0293.

Fortunately, C0293 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0293 Trouble Code For Specific Cars

C0293 Marendaz 13 Transmission 4-Wheel Drive Low Indicator Circuit Failure
C0293 Overland 38 Door Unlock Disarm Switch Circuit Short To Ground
C0293 Acura Rsx ABS Inlet Valve Coil LR Circuit Failure
C0293 Morris Mini Moke Brake Switch Out Of Self Test Range
C0293 Humber Hawk Right Rear Center Sensor Circuit Short to Vbat
C0293 Panhard L6 Driver Power Window One Touch Window Relay Circuit Short To Ground
C0293 Lamborghini Jarama Signal Link Short to Ground (Non SCP) / From NGV Module