NHTSA ID Number: 10143413
Manufacturer Communication Number: 18149
TSB/Document Date: 2018-08-06
Summary
18149 - Customer Satisfaction Program. Certain vehicles may have a condition in which, the front and/or rear spring strap retainer bolts, and the front and/or rear stabilizer shaft clamp bolts may not have achieved the intended torque value. Under-torqued fasteners could result in suspension noise or shortened service life of components. Confirm the torque of the identified fasteners or replace the fasteners if bolts are one-time use. The Service Procedure below includes VIN specific information on which fasteners must be serviced for each affected vehicle.
Customer Satisfaction Program
18149 Possible Inaccurate Fastener Torque
Reference Number:
Attention:
N182157470
Release Date:
Revision:
May 2018
00
This program is in effect until May 31, 2020.
Make
Chevrolet
Model
Corvette
Model Year
From
To
2018
2019
RPO
Description
Involved vehicles are marked “open” on the Investigate Vehicle History screen in GM Global Warranty Management
system. This site should always be checked to confirm vehicle involvement prior to beginning any required inspections
and/or repairs.
Condition
Correction
Certain 2018 and 2019 model year Chevrolet Corvette vehicles may have a condition in which, the front
and/or rear spring strap retainer bolts, and the front and/or rear stabilizer shaft clamp bolts may not have
achieved the intended torque value. Under-torqued fasteners could result in suspension noise or
shortened service life of components.
Confirm the torque of the identified fasteners or replace the fasteners if bolts are one-time use. The
Service Procedure below includes VIN specific information on which fasteners must be serviced for each
affected vehicle.
Parts
Quantity
4
Part Name
Part No.
11546672
BOLT FRT STAB
It is estimated that only 34 involved vehicles will require parts replaced on this vehicle. Due to the small number
of vehicles anticipated that will need this fix and the limited initial parts availability, dealers are encouraged not
to order these parts for use as shelf stock. Only order this Bolt if your VIN is listed on this Bulletin.
Reminder: Parts may be removed from Retail Inventory Management (RIM). Dealers should review the affected parts
to confirm RIM managed status. Parts may have quantity limiters in effect.
Warranty Information
Labor
Operation
9103829
9103830
9103831
Description
Replace Front Stabilizer Shaft Insulator Clamp Bolts and Retorque
Rear Stabilizer Shaft Insulator Clamp Bolts
Replace Front Stabilizer Shaft Insulator Clamp Bolts
Retorque Rear Stabilizer Shaft Insulator Clamp Bolts and Rear
Spring Retainer Bolts
Labor
Time
1.1
Trans.
Type
ZFAT
Net
Item
N/A
0.8
0.5
ZFAT
ZFAT
N/A
N/A
Service Procedure for Front Stabilizer Shaft Insulator Clamp Bolts Replacement and Retorque Rear Stabilizer
Shaft Insulator Clamp Bolts for the following VINS:
1G1Y93D79J5105098
1G1YP2D69J5602353
1G1YT2D68K5500006
1.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
2.
Remove the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in SI.
3.
Remove the front stabilizer shaft link front stabilizer shaft (x2). Refer to Stabilizer Shaft Link Replacement in SI.
4.
Remove (if equipped) the front brake rotor cooling duct deflectors. Refer to Front Brake Rotor Cooling Duct Deflector
Replacement in SI.
Copyright 2018 General Motors. All Rights Reserved.
Page 1 of 7
Customer Satisfaction Program
18149 Possible Inaccurate Fastener Torque
5055859
5.
Remove and DISCARD the front stabilizer shaft insulator clamp bolts.
6.
Remove the front stabilizer shaft clamps.
7.
Install the front stabilizer shaft clamps.
8.
Install NEW front stabilizer shaft insulator clamp bolts but DO NOT TIGHTEN.
8.1. When tightening the NEW front stabilizer shaft clamp bolts, alternate between the top and bottom bolts at each
clamp and also alternate each clamp.
8.2. After the NEW front stabilizer shaft insulator clamp bolts have been tightened to specification, check each bolt
and ensure a minimum of 50 Nm (37 lb ft) of torque has been achieved for each bolt.
8.3. Tighten the first pass 30 Nm (22lb ft)
8.4. Tighten the final pass 45-60 degrees.
9.
Install (if equipped) the front brake rotor cooling duct deflectors. Refer to Front Brake Rotor Cooling Duct Deflector
Replacement in SI.
10. Install the front stabilizer shaft link front stabilizer shaft (x2). Refer to Stabilizer Shaft Link Replacement in SI.
5055861
11. Locate and retorque the rear stabilizer shaft insulator clamp bolts to 58 Nm (43 lb ft).
12. Install the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in SI.
13. Remove support and lower the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Page 2 of 7
Customer Satisfaction Program
18149 Possible Inaccurate Fastener Torque
Service Procedure for Front Stabilizer Shaft Insulator Clamp Bolts Replacement for the following VINS
1G1Y13D74K5000011
1G1Y93D73J5105243
1G1YD2D77J5106291
1G1YF2D74J5104685
1G1Y22D91K5700058
1G1Y93D78J5105187
1G1YD2D79K5100042
1G1YF2D76J5104686
1G1Y92D73J5300379
1G1YB2D73J5104687
1G1YD3D7XJ5105707
1G1YF3D74J5105986
1G1Y92D79J5300421
1G1YB2D76J5104490
1G1YF2D70J5104926
1G1YF3D7XJ5104468
1G1Y93D71J5104690
1G1YY3D75K5101845
1G1YF2D74J5104508
1G1YM2D72J5105145
1G1YP2D67K5600022
1G1YU2D67J5602182
1G1YT3D64J5601810
1G1YS2D60K5600023
1G1YR2D62K5600018
1G1YU2D6XJ5601866
1G1YY2D72J5104503
1G1YS2D63K5600727
1G1YW2D78J5105502
1G1YW2D7XJ5105162
1G1YY2D77K5101033
1.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
2.
Remove the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in SI.
3.
Remove the front stabilizer shaft link front stabilizer shaft (x2). Refer to Stabilizer Shaft Link Replacement in SI.
4.
Remove (if equipped) the front brake rotor cooling duct deflectors. Refer to Front Brake Rotor Cooling Duct Deflector
Replacement in SI.
5.
Remove and DISCARD the front stabilizer shaft insulator clamp bolts.
6.
Remove the front stabilizer shaft clamps.
7.
Install NEW front stabilizer shaft insulator clamp bolts but DO NOT TIGHTEN.
7.1. When tightening the NEW front stabilizer shaft clamp bolts, alternate between the top and bottom bolts at each
clamp and also alternate each clamp.
7.2. After the NEW front stabilizer shaft insulator clamp bolts have been tightened to specification, check each bolt
and ensure a minimum of 50 Nm (37 lb ft) of torque has been achieved for each bolt.
7.3. Tighten the first pass 30 Nm (22lb ft)
7.4. Tighten the final pass 45-60 degrees.
8.
Install the front stabilizer shaft clamps.
9.
Install (if equipped) the front brake rotor cooling duct deflectors. Refer to Front Brake Rotor Cooling Duct Deflector
Replacement in SI.
10. Install the front stabilizer shaft link front stabilizer shaft (x2). Refer to Stabilizer Shaft Link Replacement in SI.
11. Install the front tire and wheel assemblies. Refer to Tire and Wheel Removal and Installation in SI.
12. Remove support and lower the vehicle. Refer to Lifting and Jacking the Vehicle in SI.
Service Procedure for Retorqueing Rear Stabilizer Shaft Insulator Clamp Bolts and Rear Spring Insulator Retainer
Bolts for the following VINS
1G1YJ2D79K5000015
1G1YM2D7XK5101376
1G1YW2D79J5105704
1G1YK2D79J5106086
1G1Y13D70K5100106
1G1YT2D60J5300476
1G1YX2D71J5104317
1G1YX3D72J5105739
1G1YY2D76J5106139
1G1YS2D60K5600054
1G1Y92D7XJ5300508
1G1YY2D70J5104550
1G1Y12D71J5105744
1G1YY2D73J5106146
1G1YY3D7XK5100156
1G1YU2D66J5602268
1G1Y92D74J5300360
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TSB/Document ID: 18149
Replacement Service Bulletin Number:
MFR Communication Date: 2018-05-14
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: EQUIPMENT ADAPTIVE/MOBILITY
MFR Component System:
MFR Component Subsystem:
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