P1B9D Diagnostic Trouble Code

P1B9D 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 P1B9D diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

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

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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. 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 P1B9D 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 P1B9D.

Fortunately, P1B9D is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B9D Trouble Code For Specific Cars

P1B9D Porsche Boxster Type 981 Fuel Pressure Regulator 1 Control Circuit High
P1B9D Zis 112 Seat Belt Switch Circuit Open
P1B9D Mini Iv ASM Control Circuit Range/Performance
P1B9D Sunbeam Chamois Manifold Absolute Temperature Circuit High Input
P1B9D Jeep Willys Seat Driver Recline Forward Circuit Failure
P1B9D Cisitalia 303 Exhaust Valve Control Solenoid Circuit Low (Bank 2)
P1B9D Dodge Charger Ignition Coil D Primary Circuit Malfunction