C3674 Diagnostic Trouble Code

C3674 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 C3674 diagnostic trouble code may include:

The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Faulty PCM
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Diminished fuel efficiency

Possible Causes :

Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.
Rarely - faulty Powertrain Control Module (PCM-programming required after replacement)
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector. Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors.

Process Tips

Diagnostic trouble code C3674 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 C3674.

Fortunately, C3674 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3674 Trouble Code For Specific Cars

C3674 Singer Super Invalid Steering Wheel Angle Sensor ID
C3674 Dodge Polara Ignition Run Circuit Short To Ground
C3674 Volkswagen Parati Right Rear Sensor Circuit Fault
C3674 Holden Ht Power Limit Shutdown Fault
C3674 Audi Ad ANTI THEFT INPUT SIGNAL SHORT TO GROUND
C3674 Chevrolet Master EGI Functionality Test Failed
C3674 Simca Vedette Marly Internal Control Module Keep Alive Memory (KAM) Error