B0934 Diagnostic Trouble Code

B0934 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 B0934 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
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.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

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. 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.

Process Tips

Diagnostic trouble code B0934 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 B0934.

Fortunately, B0934 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

B0934 Trouble Code For Specific Cars

B0934 Ford Explorer V Memory Off Switch Circuit Short to Battery
B0934 Piaggio Porter Engine Oil Temperature Sensor Low
B0934 Unipower 1275 Power Window LR Motor Circuit Failure
B0934 Iso Lele SCP (J1850) Invalid or Missing Data for Remote Button Control
B0934 Mercedes-benz Cls Class Air Suspension Compressor Relay Circuit Open
B0934 Ford F-350
B0934 Chrysler Expresso Evaporative Emission (EVAP) System Flow During Non-Purge Chevrolet Only