P0C15 Diagnostic Trouble Code

P0C15 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 P0C15 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
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

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

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. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code P0C15 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 P0C15.

Fortunately, P0C15 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0C15 Trouble Code For Specific Cars

P0C15 Suzuki Sx4 Mirror Driver Switch Assembly Circuit Open
P0C15 Scion Xd Injector Circuit / IDM Codes Not Updated
P0C15 Mercedes 35 Hp A/C Water Pump Detection Circuit Failure
P0C15 Nissan 270 Chime Input Request Circuit Short To Ground
P0C15 Chevrolet Corsica Driver Side Crash Sensor Internal Fault
P0C15 Lammas-graham Supercharged Speed Control Actuator Assembly Cable Slack Failure
P0C15 Oldsmobile 442 Cylinder 4 Injector Circuit Low