C3439 Diagnostic Trouble Code

C3439 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 C3439 diagnostic trouble code may include:

Faulty or damaged wiring
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Poor fuel economy
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected

Possible Causes :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

Now, clear the codes and test-drive the vehicle to see if the code is reset. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground.

Process Tips

Diagnostic trouble code C3439 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 C3439.

Fortunately, C3439 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3439 Trouble Code For Specific Cars

C3439 Mg X20 Alternator Load Input Failed Low
C3439 Caterham Seven Door Driver Reset Switch Stuck Failure
C3439 Peugeot 107 Dynamic Stability Control Right Front Valve Malfunction
C3439 Vauxhall Zafira Pressure Transducer Redundant / Secondary Input Circuit Failure
C3439 Bond Equipe Control Module Long Term Memory Performance/ Immobilizer Code Words Do Not Match
C3439 Lagonda 11.1 Shift Solenoid C Performance or Stuck Off
C3439 Cisitalia 750 Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 1)