P179D Diagnostic Trouble Code

P179D 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 P179D 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
Engine surge

Possible Causes :

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

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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed.

Process Tips

Diagnostic trouble code P179D 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 P179D.

Fortunately, P179D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P179D Trouble Code For Specific Cars

P179D Tracta Tracta Passenger Side Airbag Fault
P179D Buick Lacrosse Cylinder 8 Injector Circuit High
P179D Chevrolet Camaro 5 Driver Power Window Motor Circuit Open
P179D Jaguar Xj6 Seat Driver Front Up Switch Circuit Short To Battery
P179D Mercedes E 180 ABS Outlet Valve Coil RR Circuit Short To Ground
P179D Mazda 360 Transmission Transfer Case Contact Plate 'C' Open Circuit
P179D Messerschmitt Tiger Air Suspension RF Corner Down Timeout