2024 Mack LR Recall: Circuit connecting the horn button to the horn is missing, making the horn…
NHTSA campaign 23V310000 · Electrical System · filed May 2, 2023 · verified Jul 30, 2026
The defect
Mack Trucks, Inc. (Mack) is recalling certain 2024 LR electric garbage trucks, equipped with electric horns. The circuit connecting the horn button to the horn is missing, making the horn inoperative.
The risk
A vehicle with an inoperative horn cannot alert other drivers, increasing the risk of a crash.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →The fix — what to do
Dealers will add the necessary circuits to connect the horn button to the horn, free of charge. Owner notification letters were mailed June 20, 2023. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC443.
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.
Affected vehicles
Related recalls
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Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 23V310000 (manufacturer number SC443). Data last verified Jul 30, 2026.