C0034 Diagnostic Trouble Code

C0034 is a kind of OBD-II Diagnostic C-Chassis 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 C0034 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Malfunction Indicator Lamp (MIL) illuminated

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.
Faulty IMRC actuator/sensor

Repair Processes :

It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem. 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 C0034 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 C0034.

Fortunately, C0034 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0034 Trouble Code For Specific Cars

C0034 Renault Megane Heated Backlite Input Circuit Open
C0034 Pontiac 28 Exhaust Not Warm, Downstream O2 Sensor
C0034 Land Rover Lr3 Steering VAPS II Circuit Loop Short To Battery
C0034 Rolls-royce 100ex Hydraulic Pressure Unit
C0034 Volkswagen 1303 Rear Cargo Door Set Switch Stuck (Short to Ground)
C0034 Dodge Durango Ignition Coil Primary Circuit Failure
C0034 Lea-francis 1.5-litre System Voltage Low