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:

If the DPF is not cleared the ECU will revert to the "Limp Home Mode" until the situation is corrected
Corroded or damaged connector
Reduction in engine performance, especially at low RPM levels
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.
Fuel with a large percentage of sulfur will clog the DPF quickly

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. Look for rubbing, scraping, bare wires, worn spots or melted plastic connectors. Pull the connectors apart and carefully look at the terminals (the metal parts) inside the connectors.

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.

P1205 Trouble Code For Specific Cars

U0306 Mercedes-Benz Bionic+ Traction Control Motor Potentiometer Circuit Open
U0306 MG RV12 Secondary Air Injection System Switching Valve A Circuit Shorted
U0306 Maserati 430 Transmission Component Slipping/ Transmission Mechanical Transfer Case 4x4 Switch Circuit Failure
U0306 Bentley Arnage Chime Input Request Circuit Short To Battery
U0306 Toyota Aristo Glow Plug Monitor Fault (Bank #1)
U0306 Matra-Simca Murena TSS Circuit Intermittent Malfunction
U0306 Ferrari 500 Injector Control Pressure Not Detected During Crank