NHTSA ID Number: 10240168
Manufacturer Communication Number: LI46.35-N-076604
TSB/Document Date: 2023-08-02
Summary
Various concerns in relation to electric power steering including Rattling/humming noise from electric power steering when steering fully turned (see video recordings 01 and 02).
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TSB/Document ID: LI46.35-N-076604
Replacement Service Bulletin Number:
MFR Communication Date: 2023-07-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STEERING
MFR Component System:
MFR Component Subsystem:
Previous TSB | Next TSB |
Electric Power Steering Diagnosis
Topic number
LI46.35-N-076604
Version
1
Function group
46.35 - Electrical steering
Date
7/11/23
Validity
Model 447
Model 907 except code ZG1 (Engageable all-wheel drive)
and except code ZG3 (Engageable all-wheel drive with
transmission ratio)
Reason for change
Complaint
Various concerns in relation to electric power steering including Rattling/humming noise from electric power steering
when steering fully turned (see video recordings 01 and 02).
Attachments
File
Description
01.mp4
Noise on underbody from electric power steering when
steering fully turned.
02.mp4
Noise in vehicle from electric power steering when steering fully turned.
Cause
1.
2.
3.
•
Check vehicle history for repairs in relation to front of vehicle or wheel damages
Inspect wheels, suspension and steering gear for damages as shown in example pictures below.
If no physical damages are found during inspection, pull the boots back to inspection for signs of corrosion/water
or damages.
If the presence of water is found inside the boots or rack, in combination with no physical outer damage, this is a
sign of the vehicle being used in high water situations and will not be warrantable.
NOTE:
•
•
•
Please review AH46.20-P-9409-01A for vehicles that have been in an accident
Please review AP46.00-D-4650TS Check condition of steering mechanism
Please review attached Steering Gear Diagnosis presentation from 2021 NDTD
Ball screw drive (KGT) of electric power steering damaged by:
•
1.
External force due to:
Hitting a curb or post with the front wheels.
11.07.2023 05:49:20
© Copyright Mercedes-Benz
AG
Page 1 / 5
2.
Driving over obstacles (e.g. pothole/ threshold/ speed bump/ gully) at an inappropriate speed.
•
1.
Corrosion / water ingress due to damaged boot:
Cracks (see picture 03).
2.
High pressure cleaner (see picture 04).
3.
Animal bite (see picture 05).
4.
Defective retaining clamp (see picture 06).
Attachments
File
Description
03.jpg
Corrosion / water ingress due to damaged boot (cracks).
11.07.2023 05:49:20
© Copyright Mercedes-Benz AG
Page 2 / 5
04.jpg
Corrosion / water ingress due to damaged boot (high
pressure cleaner).
05.jpg
Corrosion / water ingress due to damaged boot (animal
bite).
06.jpg
Corrosion / water ingress due to damaged boot (defective
retaining clamp).
Steering Gear Diagnosis NDTD2021.pdf
Steering Gear Diagnosis- NDTD2021
WIS-References
Document number
Title
Note
AH46.20-P-9409-01A
Evaluating steering gear when repairing accident vehicles
all models
AP46.00-D-4650TS
Check condition of steering mechanism
all models
Remedy
***********************************************************************************************************************
11.07.2023 05:49:20
© Copyright Mercedes-Benz AG
Page 3 / 5
Note: The replacement of component parts (I.E. replacement of electric power steering) or the invoicing of material
costs or wage costs through warranty or goodwill in combination with any improper use of the vehicle or any external
damage is not permitted.
***********************************************************************************************************************
1.
Replace electric power steering.
Information: See AR46.20-S-0500E for model 447 with engine 274
See AR46.20-D-0500TS for model 907 except code ZG1 (Engageable all-wheel drive) and except code ZG3 (Engageable all-wheel drive with transmission ratio)
WIS-References
Document number
Title
Note
AR46.20-D-0500TS
Remove/install steering gear
Model 907 except code ZG1 (Engageable all-wheel drive) and except code
ZG3 (Engageable all-wheel drive with
transmission ratio)
AR46.20-S-0500E
Remove/install steering gear
Model 447 with engine 651, 654.9 except code ZG2 (Permanent all-wheel
drive) Model 447, 448 with engine 274
Symptoms
Chassis/suspension > Noises > Humming/droning/throbbing
Chassis/suspension > Noises > Vibrates
Chassis/suspension > Noises > Grunting
Chassis/suspension > Steering system > Noises > Chattering/knocking
Chassis/suspension > Steering system > Noises > Humming/vibrations
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
-
Additional necessary replace- 1
ment part scopes, small parts,
workshop equipment or consumable materials must be replaced according to the information in the repair documents
referred to in this document.
These are to be determined
according to the vehicle identification number (VIN) through
the XENTRY Portal Parts Information system.
X
-
Additional necessary replace- ment part scopes, small parts,
workshop equipment or con-
X
11.07.2023 05:49:20
© Copyright Mercedes-Benz AG
Page 4 / 5
sumable materials must be replaced according to the information in the repair documents
referred to in this document.
These are to be determined
according to the vehicle identification number (VIN) through
the XENTRY Portal Parts Information system.
Operation numbers/damage codes
Op. no.
Operation text
Time
Damage
code
Note
4648638
Rack-and-pinion steering sealing
boot – loose Note: Only for the case that the customer complaint does
not involve any improper use of the
vehicle or external damage. The listed damage code is not to be considered as an acceptance of costs.
The general guidelines in the Warranty Manual apply.
463013
Replace electric power steering
---
Information: Model 907
463406
Replace electric power steering
---
Information: Model 447
11.07.2023 05:49:20
© Copyright Mercedes-Benz AG
Page 5 / 5
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