C0374 Diagnostic Trouble Code

C0374 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 C0374 diagnostic trouble code may include:

Vacuum leak on the engine
Reduction in engine performance, especially at low RPM levels
Engine surge
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.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. 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 the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for.

Process Tips

Diagnostic trouble code C0374 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 C0374.

Fortunately, C0374 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C0374 Trouble Code For Specific Cars

C0374 Lotus Elan TP (Mechanical) Circuit Malfunction
C0374 Mitsubishi Colt Audio Reverse Aid Mute Input Ckt Failure
C0374 Peugeot Bipper Electronic Throttle Monitor Malfunction
C0374 Matra-simca Rancho Transmission Pressure Circuit Solenoid Open or Short to Ground
C0374 Ferrari 375 Intake Air Temperature Circuit Range/Performance Problem
C0374 Austin A99 Autolamp On Circuit Short To Ground
C0374 Rover P4 Ignition Coil Secondary Circuit Failure