C3440 Diagnostic Trouble Code

C3440 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 C3440 diagnostic trouble code may include:

Blown fuse (if applicable)
Engine surge
Reduction in engine performance, especially at low RPM levels
Hesitation upon acceleration

Possible Causes :

Some aftermarket accessories and performance modifications
A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Dirty air cleaner element Damaged DPF

Repair Processes :

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. 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. 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.

Process Tips

Diagnostic trouble code C3440 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 C3440.

Fortunately, C3440 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

C3440 Trouble Code For Specific Cars

C3440 Ford Aerostar LF LAMP LOW BEAM CIRCUIT Failure
C3440 Mazda Capella Transmission Transfer Case Differential Lock-Up Solenoid Circuit Failure
C3440 Tvr 1300 Persistent Misfire
C3440 Durkopp 20 Hp Immobilizer ID Does Not Match
C3440 Mini Clubman APLSOL Solenoid Circuit Malfunction
C3440 Bmw Coupe Climate Control Temperature Differential Circuit Short To Battery
C3440 Fiat 2 Lack Of HO2S22 Switch - Sensor Indicates Lean