P3940 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.

P3940 Code Symptoms :

When you turn on the ignition, the Service Engine Soon or Check Engine P3940 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 P3940!

Diagnosis And Repairing P3940

P3940 OBD 2 code on vehicles with electronically controlled automatic transmissions, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission.

How to fix P3940 code ?

• Continuous oil flow to the VCT piston chamber
• Damaged ECM
• Intake Valve Timing Control Solenoid Valve circuit poor electrical connection
• Engine Control Module (ECM)