U0312 Diagnostic Trouble Code

U0312 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 U0312 diagnostic trouble code may include:

Possible spark knock (detonation / pre-ignition)
Poor fuel economy
The engine oil will exhibit dilution from the ECUs attempts to increase engine temperature. Some vehicles advance the fuel injection timing slightly after top center to afterburn a small amount of fuel to increase exhaust temperatures. Some of this fuel enters the crankcase. When the ECU determines the necessity to regenerate the DPF, the service life of the oil be shortened significantly
Rich or lean exhaust

Possible Causes :

The Mass Airflow sensor will also cause this problem. Mass Airflow circuit malfunction.
Fuel with a large percentage of sulfur will clog the DPF quickly
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

Look for damage to the tank indicating impact that may have damaged the fuel pump or sender. You might continue by connecting the scanner to the vehicle diagnostic connector and retrieving all stored codes and freeze frame data.

Process Tips

Diagnostic trouble code U0312 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 U0312.

Fortunately, U0312 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U0312 Trouble Code For Specific Cars

U0312 Mercedes-benz 280 Air Bag Passenger Circuit Short to Battery - Loop #2
U0312 Toyota Xyr Passenger Seatback Rearward Switch Circuit Short to Ground
U0312 Ktm Exc Servo Motor Potentiometer Defrost Circuit Short To Battery
U0312 Austin A135 Autolamp Delay Decrease Circuit Short To Battery
U0312 Volvo V40 SCP (J1850) Invalid or Missing Data for Exterior Environment
U0312 Jaguar Xj-12 Seat Driver Front Up Circuit Short To Ground
U0312 Toyota Camry O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)