U20D3 Diagnostic Trouble Code

U20D3 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 U20D3 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
Engine surge

Possible Causes :

Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
An air leak forward of the DPF will change the sensor readings resulting in the code
Defective ECU strategies or components will prevent proper regeneration

Repair Processes :

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. If you find a related TSB, the information will often help in diagnosing the code in question as TSBs are crested from many thousands of repairs. Look for damage to the tank indicating impact that may have damaged the fuel pump or sender.

Process Tips

Diagnostic trouble code U20D3 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 U20D3.

Fortunately, U20D3 is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U20D3 Trouble Code For Specific Cars

U20D3 Chrysler Ccv Engine Overtemp Condition
U20D3 Autobianchi Stellina Aux Heater Flame Sensor Circuit Open
U20D3 Duesenberg A Illuminated Entry Relay Short To Battery
U20D3 Porsche 968 Fuel level Sensor Circuit Intermittent
U20D3 Alfa Romeo Crosswagon Accessory Delay Relay Contact Short To Battery
U20D3 Mitsubishi 3000 ASM Mode Circuit Range/Performance
U20D3 Lada 117 Servo Motor Potentiometer Vent Circuit Short To Ground