P1D9C Diagnostic Trouble Code

P1D9C 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 P1D9C diagnostic trouble code may include:

Poor fuel economy
Possible spark knock (detonation / pre-ignition)
Misfire
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
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 :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code P1D9C 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 P1D9C.

Fortunately, P1D9C is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1D9C Trouble Code For Specific Cars

P1D9C Mercedes-benz 38 Air Bag Passenger Pressure Switch Circuit Failure
P1D9C Citroen Aventure Four Wheel Drive (4WD) Switch Circuit
P1D9C Dagmar 6 Gear Shift Forward Actuator Circuit / Open [forward motion, odd gears, 1,3,5]
P1D9C Honda Insight PSP Switch Input Malfunction
P1D9C Mercury Montego Air Suspension Rear Height Sensor Low Signal Circuit Open
P1D9C Toyota Master Open Power To Ground VCRM
P1D9C Turner 1500 Pedal Position Sensor B Circuit Intermittent