C0204 Diagnostic Trouble Code

C0204 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 C0204 diagnostic trouble code may include:

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

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code C0204 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 C0204.

Fortunately, C0204 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0204 Trouble Code For Specific Cars

C0204 Hanomag 2 Passenger Sliding Door Ajar Circuit Short to GND
C0204 Ferrari Gg50 Invalid /fault data received (Non SCP)
C0204 Maserati 420 Transmission Control System Range/Performance
C0204 Vegantune Evante PSD Not Fully Closed During Self-Test
C0204 Maybach Ds8 Transmission System MIL Fault
C0204 Moretti Spider Boost Calibration Low
C0204 Holden Jb Power Sliding Door Override Switch Input Ckt Short to Gnd