P12B7 Diagnostic Trouble Code

P12B7 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 P12B7 diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

An air leak forward of the DPF will change the sensor readings resulting in the code
Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code P12B7 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 P12B7.

Fortunately, P12B7 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P12B7 Trouble Code For Specific Cars

P12B7 Isetta 300 SCP (J1850) Invalid or Missing Data for Powertrain Status Request
P12B7 Ford Taurus Mirror Passenger Vertical Feedback Potentiometer Circuit Open
P12B7 Citroen Sm Fuel Pump Secondary Circuit Malfunction
P12B7 Jaguar 420 Seat Driver Backward Circuit Short To Ground
P12B7 Mercedes-benz 320 Air Bag Passenger Inflator Circuit
P12B7 Mitsubishi Minica Aux A/C Blower Speed 2 Circuit Short to Ground
P12B7 Holden Vn Pressure Control Solenoid "A" Open Circuit