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 Abarth Monomille A/C Demand Out of Self Test Range
C0034 Daihatsu Sonica Glow Plug Circuit Low Input (Bank #2)
C0034 Mercedes S 420 Air Assist Control Valve Range/Performance
C0034 Italdesign Buron SCP (J1850) Invalid or Missing Data for Window Wiper / Washer
C0034 Alfa Romeo 2000 ABS Pump Switch Circuit Failure
C0034 Hyundai Coupe SCP (J1850) Invalid Data from GEM
C0034 Ford Fusion Mirror Driver Horizontal Feedback Potentiometer Circuit Short to Ground