P1B9B Diagnostic Trouble Code

P1B9B 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 P1B9B diagnostic trouble code may include:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
Hesitation upon acceleration

Possible Causes :

A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Dirty air cleaner element Damaged DPF
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. 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.

Process Tips

Diagnostic trouble code P1B9B 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 P1B9B.

Fortunately, P1B9B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B9B Trouble Code For Specific Cars

P1B9B Kia Koup Seat Track Position Switch Circuit Short to Ground
P1B9B Maserati Karif Transmission Fluid Pressure Sensor/Switch E Circuit High
P1B9B Nissan 1400 Child Seat Detection Circuit Open
P1B9B Maserati Racing Transmission Fluid Temperature Sensor Circuit Malfunction
P1B9B Hyundai Veracruz SCP (J1850) Invalid or Missing Data for Engine RPM
P1B9B Mercedes A 140 AAI Circuit Malfunction
P1B9B Riley 9 Horn Output Relay Circuit Short to Battery