B3128 Diagnostic Trouble Code

B3128 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 B3128 diagnostic trouble code may include:

Engine surge
Blown fuse (if applicable)
Lack of power
Rich or lean exhaust

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble. 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 B3128 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 B3128.

Fortunately, B3128 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B3128 Trouble Code For Specific Cars

B3128 Steyr Type 200 Lamp Turn Signal Front Output Circuit Failure
B3128 Nissan 1-tonner Chime Circuit Failure
B3128 Chevrolet Caprice Driver Power Window Motor Circuit Short To Ground
B3128 Lada 1300 Shift Malfunction
B3128 Franklin 11 Needle Lift Sensor Malfunction
B3128 Jensen 541 Seat Driver Recline Forward Circuit Short To Ground
B3128 Graham Streak Passenger Power Window Motor Circuit Open