C0346 Diagnostic Trouble Code

C0346 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 C0346 diagnostic trouble code may include:

Carbon Buildup on O2 Sensor
Malfunction Indicator Lamp (MIL) illuminated
Hesitation upon acceleration
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Some aftermarket accessories and performance modifications

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. 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. 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 C0346 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 C0346.

Fortunately, C0346 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0346 Trouble Code For Specific Cars

C0346 Merkur Xr Air Suspension RF Air Spring Solenoid Output Circuit Short To Battery
C0346 Ford Fairlane
C0346 Aymesa Gala Aux Heater Start Counter Overrun/System Locked (same as below ?)
C0346 Cadillac Esv Decklid Release Circuit Failure
C0346 Rover 2300 Ignition Coil - Cylinder 1 - Early Activation Fault
C0346 Unic 13 Power To A/C Clutch Circuit Overcurrent
C0346 Chrysler Crossfire Engine Speed Input Circuit Range/Performance