P112B Diagnostic Trouble Code

P112B 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 P112B diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
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

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 air leak at or near the number one oxygen sensor would also cause a 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. Now, clear the codes and test-drive the vehicle to see if the code is reset. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code P112B 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 P112B.

Fortunately, P112B is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P112B Trouble Code For Specific Cars

P112B Dodge Coronet Ignition Coil G Primary/Secondary Circuit Malfunction
P112B Stutz E4 Lateral Accelerometer circuit Failure
P112B Audi S4 Audio CD/DJ Thermal Shutdown Fault
P112B Chevrolet Ss Electrodrive Fan 1 Operational Failure (Driver Side)
P112B Subaru Outback 2 LF LAMP LOW BEAM CIRCUIT Failure
P112B Volkswagen Citi Reverse Input Circuit
P112B Vaz 2120 PRNDL Input #3 Circuit Failure