Technical Service Bulletins

BMW Goes Into Failsafe

Order Reprints
BMW Goes Into Failsafe

This bulletin applies to 2010 BMW 335i xDrive vehicles. The transmission may go into failsafe mode, with fault code 4F8D (ratio monitoring, gearshift 5-4 – plausibility) stored in the EGS. The cause is over-sensitive EGS software.

The fault may occur during a 5-4 downshift only in vehicles with either low mileage, a replacement transmission or after a reset of the adaptation values.

The transmission adaptation occurs only at a transmission oil temperature of 75 degrees Celsius or higher (167 Fahrenheit). Once the transmission oil temperature of 167 F has been reached, carry out the adaptation as follows:

1. In drive position D, increase vehicle speed up to 4th gear at about 25 mph, but do not allow a shift into 5th gear.

2. Allow the vehicle to then coast to a stop and keep the vehicle stationary for about 15 seconds with the brake pedal applied.

3. Next, with the vehicle stationary, change from D to N and back again to D.

4. Repeat steps 1 to 3 approximately 10 times.

Related Articles

BMW Steering Gear Goes Thump

Pop Goes the Piston

Jeep Goes Clatter

You must login or register in order to post a comment.