B212B Diagnostic Trouble Code

B212B is a kind of OBD-II Diagnostic B-Body 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 B212B diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
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
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Defective ECU strategies or components will prevent proper regeneration

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. Look at the plug wires to make sure they are not burnt or laying on the exhaust. If all testing has passed so far yet you still have the same code, check your scan tool and see if it can open and close the IMRC valve.

Process Tips

Diagnostic trouble code B212B 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 B212B.

Fortunately, B212B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B212B Trouble Code For Specific Cars

B212B Spectre R Lamp Brake Warning Output Circuit Open
B212B Saturn Astra Illuminated Entry Relay Short To Ground
B212B Mg Rv8 Airbag Deployment Indication Input Fault
B212B Nissan 370z CID Low
B212B Alta 1.5-litre Air Bag Passenger Inflator Circuit Resistance Low on Squib
B212B Cadillac Coupe Decklid Ajar Rear Door Circuit Short To Battery
B212B Lutzmann Lutzmann Traction Control Valve LF Circuit Open