B3939 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.

B3939 Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine B3939 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 B3939!

Diagnosis And Repairing B3939

B3939 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 B3939 code ?

• Continuous oil flow to the VCT piston chamber
• Faulty oil control valve (OCV)
• Fuel injectors harness is open or shorted
• Continuous oil flow to the VCT piston chamber