NHTSA ID Number: 10249018
Manufacturer Communication Number: B360121
TSB/Document Date: 2024-02-01
Summary
At low outside temperatures (below 40 degrees F) and slow driving speeds (i.e. when parking, maneuvering)with a large steering angle, the front end can be slightly axially misaligned. This can be felt (jerking)/ heard via an acoustic acknowledgement (clunk) as seen at the 11 second mark of the video. See attached video V36 01 21.
1/16/24, 7:39 AM
36 01 21_CLUNKING SOUNDS AND VEHICLE JERKING AT SLOW SPEEDS WITH LARGE STEERING ANGLE
2024-01-08
This Service Information Bulletin (Revision 1) replaces SI B36 01 21 dated April 2021.
What’s New (Specific text highlighted):
Models added
MODEL
F22 (2 Series Coupe)
F23 (2 Series
Convertible)
F80 (M3 Sedan)
F83 (M4 Convertible)
F85 (X5 M Sports
Activity Vehicle )
F86 (X6 M Sports
Activity Coupe)
F91 (M8 Convertible)
F96 (X6 M Sports
Activity Coupe)
G02 (X4 Sports Activity
Coupe)
G09 (BMW
XM Sports
Activity Vehicle)
G16 (8 Series Gran
Coupe)
F92 (M8 Coupe)
F97 (X3 M Sports
Activity Vehicle)
G05 (X5 Sports Activity
Vehicle)
G20 (3 Series Sedan)
G22 (4 Series Coupe)
G29 (Z4 Roadster)
G30 (5 Series Sedan)
I12 (i8 Coupe)
F90 (M5 Sedan)
F95 (X5 M Sports
Activity Vehicle )
G01 (X3 Sports Activity
Vehicle)
G07 (X7 Sports Activity
Vehicle)
G15 (8 Series Coupe)
G23 (4 Series
Convertible)
I15 (i8 Roadster)
G12 (7 Series Sedan)
F82 (M4 Coupe)
F87 2016 to 2018: (M2
Coupe). 2019, 2020:
(M2 Competition
Coupe)
F93 (M8 Gran Coupe)
F98 (X4 M Sports
Activity Coupe)
G06 (X6 Sports Activity
Coupe)
G14 (8 Series
Convertible)
All when equipped with Summer/High Performance (HP) tires.
SITUATION
At low outside temperatures (below 40 degrees F) and slow driving speeds (i.e. when parking, maneuvering)
with a large steering angle, the front end can be slightly axially misaligned.
This can be felt (jerking)/ heard via an acoustic acknowledgement (clunk) as seen at the 11 second mark of
the video.
See attached video V36 01 21.
CAUSE
Technical explanation:
The kinematics (the branch of mechanics that deals with pure motion, without reference to the masses or
forces involved in it.) of the front axle geometry are deliberately designed to deviate from the so-called
"Ackermann function".
Ackermann function - The inside wheel is steered to a greater angle than the outside wheel, allowing the
inside wheel to steer a tighter radius. Without the Ackermann function, the inside tire would tend to “scrub”
on the pavement because it’s being forced to travel in a larger radius.
This Ackermann function becomes evident in improved handling and a reduced vehicle turning radius. The
patent for this design was issued in 1818 for horse-drawn carriages.
Summer tires, especially High Performance (HP) tires with further improved grip level, exhibit reduced
profile elasticity at low temperatures due to their rubber compound and profile design.
Copyright ©2024 BMW of North America, Inc.
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1/16/24, 7:39 AM
36 01 21_CLUNKING SOUNDS AND VEHICLE JERKING AT SLOW SPEEDS WITH LARGE STEERING ANGLE
This causes tension in the tire when driving slowly with very large steering angles. When rolling (particularly
in case of an abrupt change in the coefficient of friction due to a change in road surface or differing road
surface levels), the tension is released in individual or several successive jerking movements. See attached
video V36 02 21.
This "jerking" is harmless and cannot be suppressed for design reasons. This is normal behavior in agile /
sporty vehicles in these conditions.
Note:
There is no vehicle damage involved
This is of no consequence for vehicle safety
This does not cause tension in the all-wheel drive drivetrain
INFORMATION
Diagnostic steps to confirm the jerking due to the “Ackermann function”.
1. Repeat the driving condition using warmed-up tires (i.e. by driving or parking in climate controlled
garage/workshop).
2. Repeat the driving condition using a tire with a lower grip level (i.e. winter tires or all season tires).
3. If there is any indication of damage (i.e., “curb rash”), check the wheel alignment, make any
corrections necessary and reassess.
Recommend to the customer the use of winter or all-season tires during the cold season if the diagnostic
steps confirm the jerking/clunking due to the “Ackermann function”.
CLAIM INFORMATION
This Service Information Bulletin serves to provide Technical Information to aid you in understanding the
situation described above.
QUESTIONS REGARDING THIS BULLETIN
Technical inquiries
Warranty inquiries
Submit feedback at the top of this bulletin
Please contact the Warranty department by either using the Live Chat
that’s available in the Warranty Documentation Portal or through IDS by
selecting Coverage, Policy, Coding Questions and Mileage Corrections
Supporting Materials
Videos
36 01 21
36 02 21
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1/16/24, 7:39 AM
36 01 21_CLUNKING SOUNDS AND VEHICLE JERKING AT SLOW SPEEDS WITH LARGE STEERING ANGLE
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TSB/Document ID: B360121
Replacement Service Bulletin Number:
MFR Communication Date: 2024-01-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STEERING
MFR Component System:
MFR Component Subsystem:
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