C0484 Diagnostic Trouble Code

C0484 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 C0484 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
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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. 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 C0484 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 C0484.

Fortunately, C0484 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0484 Trouble Code For Specific Cars

C0484 Cadillac Osceola Dim Panel Decrease Input Circuit Short To Ground
C0484 Peugeot Boxer Electronic Throttle Monitor PCM Override
C0484 Mercedes S 600 Air Bag Crash Sensor #1 Feed/Return Circuit Failure
C0484 Triumph Mayflower PATS Received Incorrect Key-Code From Ignition Key Transponder
C0484 Ford Triton Misfire Rate Catalyst Damage Fault - Bank 1
C0484 Opel Commodore Decklid Punch-Out Sensor Open Circuit
C0484 Ford Mondeo Mirror Driver Vertical Switch Circuit Short To Battery