P1D9B Diagnostic Trouble Code

P1D9B 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 P1D9B diagnostic trouble code may include:

Excessive exhaust leak
Hesitation upon acceleration
Malfunction Indicator Lamp (MIL) illuminated
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

Possible Causes :

Defective ECU strategies or components will prevent proper regeneration
The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.

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. Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed.

Process Tips

Diagnostic trouble code P1D9B 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 P1D9B.

Fortunately, P1D9B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1D9B Trouble Code For Specific Cars

P1D9B Opel Tigra Door Handle Right Front Circuit Open
P1D9B Kia Kcv Seat Track Position Switch Circuit Open
P1D9B Brough Superior 4-litre Cruise Control Coast Signal Malfunction
P1D9B Ford Wagon Motor # 1 Input Circuit Failure
P1D9B Tesla S Mismatched PCM and/or ABS-TC Module
P1D9B Talbot Sunbeam-lotus Mirror Passenger Right Circuit Open
P1D9B Mercedes A Class ABS Hydraulic Brake Switch Circuit Failure