C0334 Diagnostic Trouble Code

C0334 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 C0334 diagnostic trouble code may include:

Diminished fuel efficiency
Fuel pressure too high
Malfunction Indicator Lamp (MIL) illuminated
Reduction in engine performance, especially at low RPM levels

Possible Causes :

Dirty air cleaner element Damaged DPF
A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
Faulty IMRC actuator/sensor

Repair Processes :

If the engine displays a miss and there wasn't a code, determine which cylinder is misfiring. If the exhaust manifold is visible, spay or pour a small amount of water on each cylinder exhaust port. Water will evaporate immediately on good cylinders and slowly on the missing cylinder. If this can't be accomplished pull the plugs and check the condition. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code C0334 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 C0334.

Fortunately, C0334 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0334 Trouble Code For Specific Cars

C0334 Hyundai Elantra SCP (J1850) Invalid Data from SCLM
C0334 Pontiac Executive Exhaust Pressure Sensor Low
C0334 Infiniti Q45 SCP (J1850) Invalid or Missing Data for External Lamps
C0334 Maserati 4200 Gt Transmission Fluid Pressure
C0334 Bmw 5 Chime Input Request Circuit Failure
C0334 Gmc Yukon Park Lamp Flash Relay Circuit Short to Battery
C0334 Vauxhall Calibra Pressure Control Solenoid "A" Short Circuit