C203D Diagnostic Trouble Code

C203D 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 C203D diagnostic trouble code may include:

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
Faulty or damaged wiring
Hesitation upon acceleration
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.
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. 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 C203D 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 C203D.

Fortunately, C203D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C203D Trouble Code For Specific Cars

C203D Mercury Sable Air Suspension Reservoir Pneumatic Failure
C203D Pierce-arrow Series Engine Overboost Condition
C203D Chrysler Pacifica Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
C203D Renault Kangoo Glow Plug/Heater Indicator Circuit Malfunction
C203D Vale 8 Power Window Master Circuit Failure
C203D Nissan Terrano Cylinder #1 High To Low Side Short
C203D Toyota Mr2 Spyder Output Speed Sensor Intermittent