N222391080 Defective Suspension Nuts – 2021-2022 Chevrolet 4500HD/5500HD/6500HD

November 23, 2022 NHTSA CAMPAIGN NUMBER: 22V874000

Hex Flange Lock Nut May Break

Broken hex flange lock nuts may cause a loss of tension, leading to steering instability, and increasing the risk of a crash.


NHTSA Campaign Number: 22V874

Manufacturer General Motors, LLC

Components EQUIPMENT

Potential Number of Units Affected 5,861



General Motors, LLC (GM) is recalling certain 2021-2022 Chevrolet 4500HD/5500HD/6500HD vehicles. The hex flange lock nuts used in the suspension and steering joints, were improperly heat treated and may break.



Dealers will replace the hex flange lock nuts as necessary, free of charge. Owner notification letters are expected to be mailed January 9, 2023. Owners may contact Chevrolet customer service at 1-800-222-1020. GM’s number for this recall is N222391080.



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.nhtsa.gov.


Check if your Vehicle has a Recall


Frequently Asked Questions (FAQs) for Safety Recall N222391080
Defective Suspension 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?

General Motors has decided that a defect which relates to motor vehicle safety may exist in certain 2021 – 2022 model year Chevrolet Silverado Medium Duty 4500HD/5500HD/6500HD vehicles.


Q2)What is the issue or condition?

Navistar, the manufacturer of these vehicles, has determined that certain hex flange lock nuts used in several locations in the suspension joints in these vehicles were not properly formed and heat treated by its supplier.


Q3) What symptoms may be experienced?  What warning signs may be associated with the issue or condition described?

Drivers may notice a degradation in vehicle handling.


Q4) What is the remedy/repair?

Dealers will replace suspect lock nuts.


Q5) What is the safety risk?  Is the vehicle safe to drive?

Improperly manufactured nuts can result in a loss of joint tension over time.  A loss of tension in the suspension joints may increase 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?

No, when a sufficient quantity of parts are available, the recall bulletin will be released, and 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/.


Chronology :

On November 18, 2022, Navistar informed GM that it was investigating a quality issue in certain hex flange lock nuts used in 2021-2022 model year Chevrolet Silverado Medium Duty vehicles, and that it had decided to conduct a safety recall to address this condition in Navistar-badged vehicles in the field. After consulting with Navistar, GM’s Safety Field Action Decision Authority (SFADA) decided to conduct a safety recall on November 22, 2022.


9 Affected Products


CHEVROLET 4500HD 2021-2022
CHEVROLET 4500XD 2021-2022
CHEVROLET 5500HD 2021-2022
CHEVROLET 5500XD 2021-2022


6 Associated Documents

Miscellaneous Document – Frequently Asked Questions (FAQs) for Safety Recall N222391080 Defective Suspension Nuts

RMISC-22V874-8260.pdf 99.014KB



Manufacturer Notices(to Dealers,etc) – Dealer Message re Stop Delivery Order for Upcoming Safety Recall N222391080 Defective Suspension Nuts

RCMN-22V874-7937.pdf 65.638KB



Defect Notice 573 Report

RCLRPT-22V874-4351.PDF 213.49KB



Recall Acknowledgement

RCAK-22V874-7729.pdf 645.232KB



Recall 573 Report – 12/7/22

RCLRPT-22V874-3179.PDF 213.503KB



Manufacturer Notices(to Dealers,etc) – Dealer Message re N222391080 – Safety Recall Defective Suspension Nuts Application for Used Vehicle Working Capital Assistance Program (WCAP)

RCMN-22V874-0412.pdf 107.446KB



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