P0034 Diagnostic Trouble Code

P0034 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 P0034 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
Diminished fuel efficiency

Possible Causes :

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

Repair Processes :

Look at the plug wires to make sure they are not burnt or laying on the exhaust. 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. Pack the connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) and reassemble.

Process Tips

Diagnostic trouble code P0034 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 P0034.

Fortunately, P0034 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

P0034 Trouble Code For Specific Cars

P0034 Mercedes-benz V Class Air Suspension Gate Solenoid Output Circuit Short To Ground
P0034 Chevrolet Comodoro Driver Sid, Side mount Airbag Circuit Short to Ground
P0034 Gilbern Invader Oil Level Lamp Circuit Short To Battery
P0034 Lti Tx Traction Control Valve LF Circuit Failure
P0034 Dixi T Idle Air Control Circuit Malfunction
P0034 Vauxhall Cavalier Pressure Control Solenoid "B" Intermittent Short
P0034 Citroen Ax Four Wheel Drive (4WD) Switch Circuit High