NHTSA ID Number: 11020907
Manufacturer Communication Number: B180225
TSB/Document Date: 2025-07-28
Summary
After engine warm up there is a rattling noise coming from the rear muffler. During diagnosis, the rattle goesaway if the vehicle is put on a lift.
7/17/25, 5:38 AM
18 02 25_RATTLING NOISE FROM REAR MUFFLER (G45 – B48P ENGINE)
SIB 18 02 25
RATTLING NOISE FROM REAR MUFFLER (G45 – B48P ENGINE)
☐
☐
2025-07-10
THIS REPAIR IS MOBILE FRIENDLY
THIS REPAIR IS REMOTE SOFTWARE UPGRADE (RSU) FRIENDLY
MODEL
G45
X3 Sport Activity Vehicle with the B48P 4-cylinder
engine
SITUATION
After engine warm up there is a rattling noise coming from the rear muffler. During diagnosis, the rattle goes
away if the vehicle is put on a lift.
CAUSE
Clearance between the heat shield and rear muffler may be out of tolerance (too close).
CORRECTION
Install two (2) 3 mm washers between the body and rear exhaust hangers.
PROCEDURE
Note: Before performing this retrofit repair procedure and submitting a claim, review the Repair
History (Claims) section located below in the Warranty Vehicle Inquiry (WVI) to confirm that a prior
claim for this retrofit repair procedure has not already been submitted and accepted.
Raise the vehicle on a lift. The following procedure shows the left side of the exhaust. This procedure needs
to be completed for both sides (left and right)
Remove the protective cover (1). NOTE:
Tightening torque for screw is 3 Nm.
Remove the nut holding the rear exhaust hanger
(1).
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of North America, Inc.
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18 02 25_RATTLING NOISE FROM REAR MUFFLER (G45 – B48P ENGINE)
Install the 3 mm washer onto the hanger (1)
(use a small amount of sealant to hold the
washer to the hanger).
Reinstall the hanger and replace the nut.
Tightening torque 19 Nm. There will be a gap
between the body and the hanger (1).
PARTS INFORMATION
When applicable, to determine the part number that applies to the specific vehicle being repaired, enter the
VIN/chassis number into either ETK or AIR, this will consider the specific equipment and/or options that are
fitted to the vehicle.
Part Number
07 14 7201571
07 11 9906089
Description
Washer (A8, 4x25)
Collar nut (M8)
Quantity
2
2
CLAIM INFORMATION
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18 02 25_RATTLING NOISE FROM REAR MUFFLER (G45 – B48P ENGINE)
Covered one-time under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light
Trucks as described below.
Defect Code:
1830900100
G45 B48P Rear silencers rattle
Obtain the flat rate unit (FRU) allowances for the following that applies.
Labor
Operation
Description
Labor Allowance
00 78 005
Reworking (Retrofit washers) rear muffler holder (Includes
verification of the issue, diagnosis, and the performing
retrofit repair) (Main work)
As applicable
00 78 505
Reworking (Retrofit washers) rear muffler holder (Includes
verification of the issue, diagnosis, and the performing
retrofit repair) (Plusposition)
As applicable
If you are using a Main labor code for another repair, use the Plus code labor operation
00 78 505 instead of 00 78 005.
Additional diagnosis work time, including the Diagnosis Worktime Flat Rate 00 58 500, are not
claimable with this repair.
Claim Repair Comments
Reference the SIB number, the issue (briefly), and the work package (WP) number performed in the technician’s RO notes,
and in the claim comments (For example: B18 02 25 body/rear exhaust hanger washer retrofit WP 1), unless otherwise
required by State law.
BMW Group’s AIR Application Resource for Flat Rate Labor Operation Codes
To obtain the corresponding flat rate unit (FRU) allowance information from the BMW Group AIR application
resource, start by entering the Chassis Number (last seven (7) characters of the VIN), and click on the
“Search” icon. If the “Vehicle Selection” window displays two or more model possible vehicle choices, select
the applicable Model, or enter the full VIN (17 characters) instead to proceed. Click on the “Flat Rate Units”
button and enter a flat rate labor operation code number “without spaces” in the field to the right, click on the
“Search” icon to display the corresponding listing of “Flat rate unit group details” that are available and their
corresponding FRU allowances.
FEEDBACK REGARDING THIS BULLETIN
Technical Feedback
Warranty Feedback
Parts Feedback
To submit feedback for the technical topic of this bulletin: Submit your
feedback in the rating box at the top of this bulletin
To submit feedback for the CLAIMS section of this bulletin: Submit an IDS
ticket to the Warranty Department, or use the chat available in the
Warranty Documentation Portal
To submit feedback for the PARTS section of this bulletin: Submit an IDS
ticket to the Parts Department
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18 02 25_RATTLING NOISE FROM REAR MUFFLER (G45 – B48P ENGINE)
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TSB/Document ID: B180225
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-10
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: STRUCTURE:BODY
MFR Component System:
MFR Component Subsystem:
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