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 Gsm Delta Passenger Sid, Side crash sensor mount fault
P07C4 Allard M Air Bag Driver Circuit Short To Battery
P07C4 Abarth Ot A/C Evaporator Air Temperature Circuit Low
P07C4 Tatra T87 Mirror Switch Reference Voltage Positive Common Open Circuit
P07C4 Oda Spider Cylinder 3 Contribution/Balance Fault
P07C4 Zaz 966 SCP (J1850) Invalid or Missing Data for Vehicle Speed
P07C4 Mercedes-benz Smart Air Suspension Front Pneumatic Failure