C1147 Diagnostic Trouble Code

C1147 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 C1147 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 :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
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 :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 C1147 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 C1147.

Fortunately, C1147 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C1147 Trouble Code For Specific Cars

C1147 Ac Aceca ABS Acceleration Switch Circuit Failure
C1147 Nissan Cima Closed Throttle Position Switch Malfunction
C1147 Citroen Gs Fuel Level Sensor Circuit Range/Performance
C1147 Princess 2000 Fuel Rail Sensor In-Range Low Failure
C1147 Prince B Fuel Rail Pressure Sensor Circuit Malfunction
C1147 Nissan Presage COURTESY LAMP OUTPUT Failure
C1147 Om Tipo Damper LR Circuit Short to Ground