March 19, 2021 NHTSA CAMPAIGN NUMBER: 21V194000
Rear Axle U-Bolt Not Properly Tightened
The misalignment may cause the propeller shaft to separate, causing a loss of power to the rear wheels and a stall, increasing the risk of a crash.
NHTSA Campaign Number: 21V194
Manufacturer Isuzu
Technical Center of America, Inc.
Components SUSPENSION
Potential Number of Units Affected 258
Summary
Isuzu Technical Center of America, Inc. (Isuzu) is recalling certain 2015-2017 Isuzu NPR, Reach, 2016-2020 Isuzu NPR XD, NPR HD, NQR, 2016-2021 Isuzu NRR, 2017-2020 Chevrolet 4500XD, 4500HD, 5500HD, and 2020 Chevrolet 5500XD vehicles. The U-bolt nuts for the rear axle may not have been properly tightened and may loosen, causing the axle to misalign.
Remedy
Isuzu will notify owners, and dealers will inspect and, if needed, replace and tighten the rear axle U-bolt nuts, free of charge. The recall began on April 23, 2021. Owners may contact Isuzu customer service at 1-866-441-9638. Isuzu’s number for this recall is V2103.
Notes
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.
Check if your Isuzu Truck has a Recall
Condition
Isuzu Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2017 and 2020 model year Chevrolet Low Cab Forward vehicles. In the affected vehicles, the U-bolt nuts for the rear axle may not have been properly tightened at the manufacturing plant. If the U-Bolt nuts loosen and fall off, the axle can misalign with the centering pin, allowing the rear axle to move rearward and the propeller shaft to separate at its slip joint. If the propeller shaft separates, the rear wheels will not receive power from the engine and the vehicle will stall, increasing the risk of a crash.
Correction
Dealers will inspect and, if needed, replace and tighten the rear axle U-bolt nuts.
Parts
| Quantity | Part Name | Part No. |
| 4 per vehicle | BOLT, RR AUX SPR | 94127924 |
| 8 per vehicle | WASHER, RR SPR U BOLT | 97360118 |
| 8 per vehicle | NUT, FRT SPR U BOLT | 97360121 |
| 4 per vehicle | BOLT U, RR SPR | 98128783 |
| 8 per vehicle | NUT, RR SPR U BOLT | 94060479 |
Frequently Asked Questions (FAQs) for Safety Recall N212333830 Rear Axle U-Bolt Nuts
These questions and answers are being provided to help GM dealers respond to inquiries from involved vehicle owners about the Safety recall identified above.
Q1) Which vehicles are involved?
Certain 2017 Chevrolet LCF 4500HD, 4500XD, 5500HD and 2020 Chevrolet LCF 4500HD, 4500XD, 5500HD, and 5500XD Trucks.
Q2) What is the issue or condition?
The U-bolt nuts for the rear axle may not have been properly tightened at the manufacturing plant.
Q3) What symptoms may be experienced? What warning signs may be associated with the issue or condition described?
Drivers may notice the rear axle out of place during the pre-trip inspection and would hear a loud noise if the propeller shaft separated during use.
Q4) What is the remedy/repair?
Dealers will inspect and, if needed, replace and tighten the rear axle U-bolt nuts.
Q5) What is the safety risk? Is the vehicle safe to drive?
The U-bolts and U-Bolt nuts secure the rear axle to the leaf spring. If the U-Bolt nuts loosen, the axle will initially be held in place by the leaf spring centering pin. With continued use, the axle can misalign with the centering pin, allowing the rear axle to move rearward and the propeller shaft to separate at its slip joint. If the propeller shaft separates, the rear wheels will not receive power from the engine and the vehicle will stall, increasing the risk of a crash.
Q6) Does the customer have to pay for this remedy/repair?
No, this inspection/repair will be done at no cost to the customer.
Q7) Is the remedy/repair available now?
An inspection is available that allows dealers to close the field action if a vehicle passes. When a sufficient quantity of parts are available dealers can begin repairing vehicles.
Q8) What should customers do until recall repairs can be completed? Are there any special instructions?
If special instructions are provided, they will be included in the notification letters to customers.
Q9) How can customers check to see if their vehicle is involved in this field action?
Customers who own a vehicle involved in the field action will be notified by mail by General Motors, but they may also check their Vehicle Identification Number (VIN) for field actions in GM Owner Center at https://my.gm.com/recalls or via NHTSA’s website at https://vinrcl.safercar.gov/vin/.
SEOCONTENT-START
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Copyright 2021 General Motors. All Rights Reserved. Page 1 of 7
Release Date:
April 2021
Revision:
01
Revision Description:
This bulletin has been revised to include the repair procedure and customer letter. Please discard all previous copies of bulletin N212333830.
Attention:
It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied.
All involved vehicles that are in dealer inventory must be held and not delivered to customers, dealer traded, or used for demonstration purposes until the repair contained in this bulletin has been performed on the vehicle.
ONLY Chevrolet Medium Duty dealers can complete this recall repair.
Make
Model
Model Year
RPO
Description
From
To
Chevrolet
LCF 4500HD
2017
2017
LCF 4500XD
LCF 5500HD
LCF 4500HD
2020
2020
LCF 4500XD
LCF 5500HD
LCF 5500XD
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
Isuzu Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2017 and 2020 model year Chevrolet Low Cab Forward vehicles. In the affected vehicles, the U-bolt nuts for the rear axle may not have been properly tightened at the manufacturing plant. If the U-Bolt nuts loosen and fall off, the axle can misalign with the centering pin, allowing the rear axle to move rearward and the propeller shaft to separate at its slip joint. If the propeller shaft separates, the rear wheels will not receive power from the engine and the vehicle will stall, increasing the risk of a crash.
Correction
Dealers will inspect and, if needed, replace and tighten the rear axle U-bolt nuts.
Parts
Quantity
Part Name
Part No.
4 per vehicle
BOLT, RR AUX SPR
94127924
8 per vehicle
WASHER, RR SPR U BOLT
97360118
8 per vehicle
NUT, FRT SPR U BOLT
97360121
4 per vehicle
BOLT U, RR SPR
98128783
8 per vehicle
NUT, RR SPR U BOLT
94060479
Due to the small number of vehicles involved, 97, and due to limited initial parts availability, dealers are encouraged not to order recall parts for use as shelf stock. Parts should only be ordered when inspection determines that it is necessary to replace the rear axle U-bolts and nuts.
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
Description
Labor Time
Trans. Type
Net Item
9105576
Inspect Axle U-Bolts – No Further Action Required (Passed)
0.5
ZFAT
N/A
9105653
Replace Axle U-Bolts (includes inspection)
1.3
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Page 2 of 7
Service Procedure
1. Shift vehicle to park, turn off engine, set parking brake, and block rear wheels.
5778276
2. Locate the rear Axles U-Bolt Mounting Nuts.
3. Use a rag or wire brush clean the U-Bolt nuts and retainer plate surface.
5778277
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Page 3 of 7
5778278
4. Use a paint pen or small brush and paint to make an alignment mark on each nut, washer (if equipped), and the
retainer plate in a straight vertical line as shown.
5. Use a torque wrench to tighten all eight (8) Rear Axle U-bolt nuts to 90 Nm (66 lb ft).
6. Inspect the painted alignment marks on all eight (8) Rear Axle U-bolt Nuts.
5778279
6.1 If ANY of the painted marks are no longer aligned proceed to Step 7 to replace the U-Bolts and U-Bolt
Nuts.
6.2 If ALL eight (8) of the Rear Axle Nut Paint Marks are still aligned, no further action is required.
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Page 4 of 7
5778280
7. Loosen and remove the two right hand side/forward Rear Axle Nuts and washers (if applicable). Lift the old Ubolt
upwards to remove it.
5778283
8. Install a new U-bolt into the same location where the old U-bolt was removed in Step 7. Make sure the U-bolt is
properly seated as shown.
9. Place the two new (2) washers (if applicable) and new nuts onto the new U-bolt. Use hand tools to lighten
tighten each nut evenly.
Important: Ensure that the nuts are properly seated and tightened evenly so that the U-bolt does not tilt.
Vehicle Model Tightening Torque
4500 HD 177 Nm (131 lb ft)
5500 HD 284 Nm (210 lb ft)
10. Use a torque wrench to alternately tighten the nuts to the specification shown above.
Important: Ensure the U-Bolt and U-bolt nuts are properly seated and tightened evenly so the U-bolt does not tilt.
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Page 5 of 7
5778286
11. Measure the amount of U-Bolt thread protruding from the U-bolt nut (1) and record your measurement.
12. Measure the amount of U-Bolt thread protruding from the U-bolt nut (2) and record your measurement
13. Determine the difference between measurements (1) and (2). The result should be 5mm or less.
13.1 If the difference between measurement (1) and (2) is 5mm or less, no further action is required.
13.2. If the difference between measurement (1) and (2) is greater than 5mm, loosen both nuts and repeat Step 10 – 13.
Dealer Responsibility – For USA & Export (USA States, Territories, and Possessions)
It is a violation of Federal law for a dealer to deliver a new motor vehicle or any new or used item of motor vehicle equipment (including a tire) covered by this notification under a sale or lease until the defect or noncompliance is remedied.
The US National Traffic and Motor Vehicle Safety Act provides that each vehicle that is subject to a recall of this type must be adequately repaired within a reasonable time after the customer has tendered it for repair. A failure to repair within sixty days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time. If the condition is not adequately repaired within a reasonable time, the customer may be entitled to an identical or reasonably equivalent vehicle at no charge or to a refund of the purchase price less a reasonable allowance for depreciation. To avoid having to provide these burdensome remedies, every effort must be made to promptly schedule an appointment with each customer and to repair their vehicle as soon as possible. In the recall notification letters, customers are told how to contact the US National Highway Traffic Safety Administration if the recall is not completed within a reasonable time.
Dealer Responsibility – All
All new, used, GM Certified Used, courtesy transportation vehicles, dealer shuttle vehicles, etc. in dealers’ possession and subject to this recall must be held and inspected/repaired per the service procedure of this bulletin before customers take possession of these vehicles. Involved vehicles must be held and not delivered to customers, dealer-traded, released to auction, used for demonstration, or any other purpose.
All GM Certified Used vehicles currently in the dealers’ inventory within the Certified Pre-Owned Inventory System (CPOIS) will be de-certified and must be held and remedied per the service procedure in this bulletin. Upon submitting an accepted/paid warranty transaction in the Global Warranty Management (GWM) system, the vehicle can be re-certified for sale within the CPOIS system, or once again be used in the CTP program.
Dealers are to service all vehicles subject to this recall at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.
Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. A copy of the customer letter is provided in this bulletin for your use in contacting customers. Recall follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Page 6 of 7
In summary, whenever a vehicle subject to this field action enters your vehicle inventory you must take the steps necessary to ensure the program correction has been made before selling the vehicle. In addition, for vehicles entering your facility for service, you are required to ensure the customer is aware of the open field action and make every reasonable effort to implement the program correction as set forth in this bulletin prior to releasing the vehicle.
Dealer Reports
For dealers with involved vehicles, a listing has been prepared and will be available through GM GlobalConnect Maxis Field Action Reports or sent directly to export dealers. The Inventory tab of the dealer reports will contain VINs that apply to this recall. This information is intended to assist dealers with the PROMPT COMPLETION of these vehicles. The Customer In-Service tab will contain customer names and addresses from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall may be a violation of law in several states.
Customer Notification
USA & Canada – General Motors will notify customers of this recall on their vehicle (see copy of customer letter included with this bulletin).
GM bulletins are intended for use by professional technicians, NOT a “do-it-yourselfer”. They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the tools, equipment, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your dealer for information on whether your vehicle may benefit from the information.
We Support Voluntary Technician Certification
Product Safety Recall
N212333830 Rear Axle U-Bolt Nuts
Page 7 of 7
IMPORTANT SAFETY RECALL
May 2021
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act.
Isuzu Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2017 and 2020 model year Chevrolet Low Cab Forward vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products.
IMPORTANT
• Your vehicle is involved in GM safety recall N212333830.
• Schedule an appointment with your GM dealer.
• This service will be performed for you at no charge.
Why is your vehicle being recalled?
The U-bolt nuts for the rear axle may not have been properly tightened at the manufacturing plant. If the U-Bolt nuts loosen and fall off, the axle can misalign with the centering pin, allowing the rear axle to move rearward and the propeller shaft to separate at its slip joint. If the propeller shaft separates, the rear wheels will not receive power from the engine and the vehicle will stall, increasing the risk of a crash.
What will we do?
Your GM dealer will inspect and, if needed, replace and tighten the rear axle U-bolt nuts. This service will be performed for you at no charge. Because of service scheduling requirements, it is likely that your dealer will need your vehicle longer than the actual inspection and service correction time of approximately 1 hour and 20 minutes.
What should you do?
You should contact your GM dealer to arrange a service appointment as soon as possible.
Do you have questions?
If you have any questions or concerns that your dealer is unable to resolve, please contact the General Motors Medium Duty Truck Customer Assistance Center at 1-800-862-4389.
If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE, Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to https://www.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V194.
Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days.
Maryann L. Combs
Vice President
Global Vehicle Safety
GM Recall: N212333830
***********************************************************************************************************************
GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5724
URGENT – DISTRIBUTE IMMEDIATELY
Date: March 19, 2021
Subject: N212333830 – Safety Recall
Rear Axle U-Bolt Nuts
Models: 2017 LCF 4500HD, LCF 4500XD, LCF 5500HD,
2020 LCF 4500HD, LCF 4500XD, LCF 5500HD, LCF 5500XD
To: All General Motors Medium Duty Dealers
General Motors is releasing Safety Recall N212333830 today. The total number of U.S. vehicles involved is approximately 93. Please see the attached bulletin for details.
Question and Answer Document (Q&A)
Attached to this message you will find a document that addresses the nine most likely questions customers may have regarding this Safety Recall. Please use this information as an aid to confidently answer customer concerns.
Customer Letter Mailing
The customer letter mailing will begin in April 2021.
Global Warranty Management (GWM)
The Required Field Action section on the Investigate Vehicle History (IVH) screen will be updated March 20, 2021 or sooner. A list of involved vehicles in dealer new inventory is attached to this message. Please hold all warranty transactions until IVH has been updated.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
***********************************************************************************************************************
GLOBAL SAFETY FIELD INVESTIGATIONS
DCS5775
URGENT – DISTRIBUTE IMMEDIATELY
Date: April 27, 2021
Subject: REVISION – N212333830-01 – Product Safety Recall
Rear Axle U-Bolt Nuts
Customer Letter & Repair Procedure Added
Models: 2017 LCF 4500HD, LCF 4500XD, LCF 5500HD,
2020 LCF 4500HD, LCF 4500XD, LCF 5500HD, LCF 5500XD
To: All General Motors Medium Duty Dealers
Bulletin N212333830-01 has been revised to include a copy of the customer notification letter and repair procedure. Please discard all copies of bulletin N212333830.
Customer Letter Mailing
The customer letter mailing will begin on May 6, 2021.
END OF MESSAGE
GLOBAL SAFETY FIELD INVESTIGATIONS
***********************************************************************************************************************
IMPORTANT SAFETY RECALL
May 2021
This notice applies to your vehicle, VIN: _____________________________________
Dear General Motors Customer:
This notice is sent to you in accordance with the National Traffic and Motor Vehicle Safety Act.
Isuzu Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2017 and 2020 model year Chevrolet Low Cab Forward vehicles. As a result, GM is conducting a safety recall. We apologize for this inconvenience. However, we are concerned about your safety and continued satisfaction with our products.
I M P O R T A N T
Your vehicle is involved in GM safety recall N212333830.
Schedule an appointment with your GM dealer.
This service will be performed for you at no charge.
Why is your vehicle being recalled? The U-bolt nuts for the rear axle may not have been properly tightened at the manufacturing plant. If the U-Bolt nuts loosen and fall off, the axle can misalign with the centering pin, allowing the rear axle to move rearward and the propeller shaft to separate at its slip joint. If the propeller shaft separates, the rear wheels will not receive power from the engine and the vehicle will stall, increasing the risk of a crash.
What will we do? Your GM dealer will inspect and, if needed, replace and tighten the rear axle U-bolt nuts. This service will be performed for you at no charge. Because of service scheduling requirements, it is likely that your dealer will need your vehicle longer than the actual inspection and service correction time of approximately 1 hour and 20 minutes.
What should you do? You should contact your GM dealer to arrange a service appointment as soon as possible.
Do you have questions? If you have any questions or concerns that your dealer is unable to resolve, please contact the General Motors Medium Duty Truck Customer Assistance Center at 1800-862-4389.
If after contacting your dealer and the Customer Assistance Center, you are still not satisfied we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 1200 New Jersey Avenue, SE, Washington, DC 20590, or call the toll-free Vehicle Safety Hotline at 1.888.327.4236 (TTY 1.800.424.9153), or go to https://www.safercar.gov. The National Highway Traffic Safety Administration Campaign ID Number for this recall is 21V194.
Federal regulation requires that any vehicle lessor receiving this recall notice must forward a copy of this notice to the lessee within ten days.
Maryann L. Combs
Vice President
Global Vehicle Safety
GM Recall: N212333830
SEOCONTENT-END
40 Affected Products
Vehicles
| MAKE | MODEL | YEAR |
| CHEVROLET | 4500HD | 2017-2020 |
| CHEVROLET | 4500XD | 2017-2020 |
| CHEVROLET | 5500HD | 2017-2020 |
| CHEVROLET | 5500XD | 2020 |
| ISUZU | NPR | 2015-2017 |
| ISUZU | NPR HD | 2016-2020 |
| ISUZU | NPR XD | 2016-2020 |
| ISUZU | NQR | 2016-2020 |
| ISUZU | NRR | 2016-2021 |
| ISUZU | REACH | 2015-2017 |
17 Associated Documents
Miscellaneous Document- Chronology
RMISC-21V194-6065.pdf 682.729KB
Recall Acknowledgement
Manufacturer Notices(to Dealers,etc)
RCMN-21V194-6556.pdf 116.153KB
Remedy Instructions and TSB
RCRIT-21V194-2816.pdf 460.745KB
Defect Notice 573 Report
RCLRPT-21V194-8479.PDF 221.924KB
Manufacturer Notices(to Dealers,etc)
RCMN-21V194-4872.pdf 100.933KB
Manufacturer Notices(to Dealers,etc)
Remedy Instructions and TSB
RCRIT-21V194-5211.pdf 340.579KB
Remedy Instructions and TSB
RCRIT-21V194-9117.pdf 486.487KB
Remedy Instructions and TSB
RCRIT-21V194-9606.pdf 1309.835KB
Owner Notification Letter(Part 577)
RCONL-21V194-1270.pdf 277.872KB
Manufacturer Notices(to Dealers,etc)
Manufacturer Notices(to Dealers,etc)
RCMN-21V194-1365.pdf 395.902KB
ISSUED Owner Notification Letter(Part 577)
RCONL-21V194-3092.pdf 24.438KB
Recall Quarterly Report #2, 2021-3
RCLQRT-21V194-9264.PDF 211.257KB
Recall Quarterly Report #3, 2021-4
RCLQRT-21V194-1469.PDF 211.344KB
Recall Quarterly Report #1, 2021-2
RCLQRT-21V194-0968.PDF 211.157KB
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