C203E Diagnostic Trouble Code

C203E 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 C203E diagnostic trouble code may include:

Rich or lean exhaust
Fuel pressure too low
Engine surge
Poor acceleration

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Faulty IMRC actuator relay (if equipped)

Repair Processes :

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. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code C203E 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 C203E.

Fortunately, C203E is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C203E Trouble Code For Specific Cars

C203E Sunbeam 2-litres Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
C203E Fairthorpe Electron Injector Circuit Malfunction - Cylinder 3
C203E Peugeot 508 EIC Switch-2 Assembly Circuit Short To Ground
C203E Mercedes B 160 ABS Hydraulic Pressure Differential Switch Input Open Circuit
C203E Infiniti G37 SCP (J1850) Invalid or Missing Data for Exterior Environment
C203E Moretti 128 Battery Temp out of Range
C203E Ginetta G3 Open Power To Ground VCRM