P07C4 Diagnostic Trouble Code

P07C4 is a kind of OBD-II Diagnostic P-Powertrain 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 P07C4 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
Rich or lean exhaust

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.
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 :

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 P07C4 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 P07C4.

Fortunately, P07C4 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P07C4 Trouble Code For Specific Cars

P07C4 Cunningham C3 Fuel Temperature Sensor #1 Circuit Open
P07C4 Citroen Ax Four Wheel Drive (4WD) Switch Circuit High
P07C4 Bmw 2800 Can Link ECM/ABSCM Circuit / Network Malfunction
P07C4 Allard M1 Air Bag Driver Circuit Short to Battery - Loop #2
P07C4 Jaguar 240 Seat Driver Backward Circuit Short To Battery
P07C4 Opel Kapitan Disable Signal Open Circuit
P07C4 Daimler Conquest Head Rest Switch Circuit Failure