P1B8B Diagnostic Trouble Code

P1B8B 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 P1B8B diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
Rich or lean exhaust

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.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

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. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code P1B8B 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 P1B8B.

Fortunately, P1B8B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1B8B Trouble Code For Specific Cars

P1B8B De Soto Firesweep Horn Output Relay Circuit Short to Battery
P1B8B Vauxhall Omega Pressure Control Solenoid B Stuck On
P1B8B Puma Mini Fuel Temperature Sensor #2 Circuit Open
P1B8B Pontiac Montana Fan Relay (High) Circuit Malfunction
P1B8B Daihatsu Trevis GPS Antenna Connection Open or Short
P1B8B Fiat Twelve Left Front Sensor Circuit Short to Vbat
P1B8B Leyland Marina Throttle Control Unit Detected Loss of Return Spring