U0383 Diagnostic Trouble Code

U0383 is a kind of OBD-II Diagnostic U-Network 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 U0383 diagnostic trouble code may include:

Poor acceleration
Cherry red hot catalytic converter
Possible spark knock (detonation / pre-ignition)
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 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.

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. 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 U0383 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 U0383.

Fortunately, U0383 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0383 Trouble Code For Specific Cars

U0383 Ford C-max Loss of KAM Power; Open Circuit
U0383 Daimler 2.5-litre Gyroscope Error
U0383 Suzuki Cultus Memory Set Switch Circuit Short To Battery
U0383 Wolseley 6
U0383 Lancia Ecv Speed Wheel Sensor Rear Center Circuit Open
U0383 Land Rover Lr3 Steering VAPS II Circuit Loop Short To Battery
U0383 Lamborghini 400 Shift Solenoid E Stuck On