C3149 Diagnostic Trouble Code

C3149 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 C3149 diagnostic trouble code may include:

Misfire
Misfire
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.
Diminished fuel efficiency

Possible Causes :

Faulty IMRC actuator/sensor
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
An air leak forward of the DPF will change the sensor readings resulting in the code

Repair Processes :

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. 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.

Process Tips

Diagnostic trouble code C3149 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 C3149.

Fortunately, C3149 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3149 Trouble Code For Specific Cars

C3149 Daewoo Rezzo
C3149 Cadillac Park Avenue Dim Panel Increase Input Circuit Failure
C3149 Toyota Prius 2 Park Brake Actuator Assembly Switch Applied Circuit Short to Gnd
C3149 Fiat Ot Lamp Turn Signal Rear Output Circuit Open
C3149 Tvr Tina Power Steering Pressure Sensor Circuit High Input
C3149 Lotec Testa Torque Converter Clutch Circuit Malfunction
C3149 Datsun 240 High Mount Stop Lamp Circuit Short to Battery