U0306 Diagnostic Trouble Code

U0306 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 U0306 diagnostic trouble code may include:

Corroded or damaged connector
If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Lack of power
The light may stay on or light intermittently as the DPF regenerates. The engine will be sluggish on acceleration.

Possible Causes :

Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Low fuel pressure caused by a clogged filter, failing fuel pump, failed fuel pressure regulator or clogged or leaking injectors.
Rough running engine due to misfiring plugs. Many engines have misfire codes to indicate the cylinder effected, such as P0307 for number 7.

Repair Processes :

Find out what kind of system you have and verify that voltage to the fuel level sensor is present at the fuel pump wiring harness. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

Process Tips

Diagnostic trouble code U0306 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 U0306.

Fortunately, U0306 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0306 Trouble Code For Specific Cars

U0306 Mercedes Sl 280 Air Bag Crash Sensor #1 Ground Circuit Open
U0306 Crossley 22 Fuel System Leak Detected Small Leak
U0306 Ford Ecosport Mass or Volume Air flow Circuit High Input
U0306 Citroen Xanae Fuel Rail Pressure Sensor Circuit Intermittent
U0306 Acura Arta ABS Hydraulic Pressure Differential Switch Input Circuit Failure
U0306 Lada Vesta Shift Solenoid C Malfunction
U0306 Rover 2000 Idle Switch Circuit Malfunction