U1556 BMW Fault Code

Description:

The issue covered by the bulletin involves a power steering noise/whine or fluid leak from the power steering pump, gear or high pressure side power steering hose during extreme low outdoor temperature operation.

U1556 Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine U1556 light should flash briefly, indicating that the OBD system is ready to scan your vehicle for any malfunctions. After this brief flash, the light should stay off while you drive as long as no problems are detected. If so, you'll be glad to know that your vehicle is equipped with an early warning system that could save you time, money, and fuel in addition to helping protect the U1556!

Diagnosis And Repairing U1556

U1556 OBD2 specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.

How to fix U1556 code ?

• Continuous oil flow to the VCT piston chamber
• 1Camshaft Position Sensor circuit poor electrical connection
• Failures of clutch motion/travel sensors.
• Oil flow restriction in the oil passages or the VCT valve body