P0B12 Diagnostic Trouble Code

P0B12 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 P0B12 diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
Reduction in engine performance, especially at low RPM levels

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.
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Look at the plug wires to make sure they are not burnt or laying on the exhaust.

Process Tips

Diagnostic trouble code P0B12 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 P0B12.

Fortunately, P0B12 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0B12 Trouble Code For Specific Cars

P0B12 Lamborghini Bravo Shift Solenoid F Control Circuit High
P0B12 Tesla S Mismatched PCM and/or ABS-TC Module
P0B12 Nissan R391 Crankshaft Position Sensor A Circuit Range/Performance
P0B12 Bmw X2 Cold Start Injector 2 Malfunction
P0B12 Toyota Mega OSS Circuit Intermittent Malfunction
P0B12 Honda Capa Pressure Control Solenoid C Performance or Stuck off
P0B12 Mazda Axela Transmission Transfer Case Contact Plate Power Short To Ground