P1BCB Diagnostic Trouble Code

P1BCB 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 P1BCB diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. Replace the oxygen sensor that is downstream from the catalytic converter on the side of the engine that does not contain cylinder #1. Also, if a oxygen sensor code stating "heater circuit malfunction" the sensor has most probably failed. 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 P1BCB 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 P1BCB.

Fortunately, P1BCB is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P1BCB Trouble Code For Specific Cars

P1BCB Mercedes Glk Accelerometer Sensor Circuit Failure
P1BCB De Tomaso Deauville Horn Switch Circuit Failure
P1BCB Nissan Exa Clutch Pedal Switch B Circuit Low
P1BCB Simca Vedette Marly Internal Control Module Keep Alive Memory (KAM) Error
P1BCB Ford Urban Mismatched PCM and/or ABS-TC Module
P1BCB Bmw M6 Clutch Pedal Switch B Circuit
P1BCB Talbot 2500 Mirror Passenger Horizontal Feedback Potentiometer Circuit Open