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 Nissan Hypermini Clutch Switch Circuit Malfunction
P0034 Mercedes-benz 290 Air Bag Passenger Circuit Short To Ground
P0034 Simca Vedette Intermediate Shaft Speed Sensor Circuit Range/Performance
P0034 Porsche Cayenne Type 92a Fuel Pump Control Out Of Range
P0034 Wartburg 1.3
P0034 Nissan Primastar Crankshaft Position Camshaft Position Correlation (Bank 1 Sensor A)
P0034 Plymouth Superbird Exhaust Gas Recirculation Circuit Malfunction