P0934 Diagnostic Trouble Code

P0934 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 P0934 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
Engine surge

Possible Causes :

Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
An air leak forward of the DPF will change the sensor readings resulting in the code

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. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

Process Tips

Diagnostic trouble code P0934 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 P0934.

Fortunately, P0934 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0934 Trouble Code For Specific Cars

P0934 Caterham 21 Door Ajar LR Circuit Open
P0934 Maserati Ghibli Transmission Fluid Pressure Sensor/Switch D Circuit High
P0934 Lanchester 40 Speed Fuel Pump Positive Feed Fault
P0934 Jeep Jeepster Seat Driver Rearward Switch Circuit Failure
P0934 Isuzu Stylus
P0934 Peugeot 3008 EGI Glow Plug Secondary Failure
P0934 Mg Pb Air Suspension Warning Lamp Circuit Short To Ground