U226U Diagnostic Trouble Code

U226U 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 U226U diagnostic trouble code may include:

Faulty or damaged wiring
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
Poor fuel economy
Reduction in engine performance, especially at low RPM levels

Possible Causes :

A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
Some aftermarket accessories and performance modifications
A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.

Repair Processes :

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. Use the DVOM to test resistance and continuity on all system circuits if actuator and sensor resistance levels are in compliance with manufacturer's specifications.

Process Tips

Diagnostic trouble code U226U 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 U226U.

Fortunately, U226U is a fairly common OBD code, meaning that it applies to all makes and models of vehicles made after 1996.

U226U Trouble Code For Specific Cars

U226U Mercedes-benz Concept Air Suspension Compressor Relay Circuit Short To Battery
U226U Cadillac Coupe Decklid Ajar Rear Door Circuit Short To Battery
U226U Aero Type 30 ABS Outlet Valve Coil LR Circuit Failure
U226U Peugeot 208 Ii EGI Glow Plug Primary Failure
U226U Monteverdi Safari Battery Power Supply ECU Circuit Short To Battery
U226U De Dion Bouton 6 Hp HO2S Heater Resistance (Bank 2 Sensor 2)
U226U Peugeot 207 EEPROM Malfunction