U3386 Diagnostic Trouble Code

U3386 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 U3386 diagnostic trouble code may include:

Faulty O2 Sensor
Lack of power
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 :

A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator relay (if equipped)
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Once located, visually inspect the connectors and wiring. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. 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. Oxygen sensors signal the engine management computer the amount of oxygen present in the exhaust, which is used in determining and controlling the fuel ratio.

Process Tips

Diagnostic trouble code U3386 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 U3386.

Fortunately, U3386 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3386 Trouble Code For Specific Cars

U3386 Kia Sorento Secondary Air Injection System Switching Valve B Circuit Open
U3386 Plymouth Volare Exhaust Gas Recirculation Sensor A Circuit High
U3386 Db Hbr HO2S Heater Control Circuit Low (Bank 2 Sensor 2)
U3386 Rover Vitesse Ignition Key-In Circuit Open
U3386 Chevrolet Corvette C5 Driver Sliding Door Ajar Circuit Short to GND
U3386 Simca 5 Intake Valve Control Solenoid Circuit Low (Bank 2)
U3386 Gaz 32 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)