NHTSA (USA)Critical
Defect
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.
Safety Risk
Broken hex flange lock nuts may cause a loss of tension, leading to steering instability, and increasing the risk of a crash.
Remedy
Dealers will replace the hex flange lock nuts as necessary, free of charge. Interim owner notification letters informing owners of the safety risk were mailed December 27, 2022. Owner notification letters were mailed February 10, 2023. Owners may contact Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N222391080.
5,861 vehicles affectedMfr ref: N222391080Updated May 25, 2026