U3306 Diagnostic Trouble Code

U3306 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 U3306 diagnostic trouble code may include:

Fuel pressure too low
Rich or lean exhaust
Diminished fuel efficiency
Malfunction Indicator Lamp (MIL) illuminated

Possible Causes :

Faulty IMRC actuator relay (if equipped)
A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
Faulty IMRC actuator/sensor

Repair Processes :

If the scan tool has that capability, and the scan tool can operate the IMRC valves, then the problem is either resolved and a simple code clearing is all that's left or a new PCM would be called for. 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 U3306 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 U3306.

Fortunately, U3306 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U3306 Trouble Code For Specific Cars

U3306 Subaru R2 License Lamp Circuit Failure
U3306 Mazda Mx-5
U3306 Talbot Saoutchik Mirror Passenger Left Circuit Short To Battery
U3306 Dkw F11 Idle Control System Malfunction
U3306 De Tomaso Pantera Hydraulic Fluid Pressure/ Flow Circuit Failure
U3306 Renault Megane 4 Heated Backlite Relay Circuit Failure
U3306 Abarth 210 4-5 Shift Malfunction