2019–2023 Mack Lrbe (electric) Recall: Cabin heater relay may fail, causing the coolant heater to overheat
NHTSA campaign 23V024000 · Electrical System · filed Jan 23, 2023 · verified Jul 30, 2026
The defect
Mack Trucks, Inc. (Mack) is recalling certain 2019 and 2021-2023 LRBE battery electric trucks. The cabin heater relay may fail, causing the coolant heater to overheat.
The risk
A coolant heater that overheats can increase the risk of fire.
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 update the software for the Hybrid Powertrain Control Unit and Instrument Cluster, and install replacement relays, free of charge. Owner notification letters were mailed March 16, 2023. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0440.
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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- 2019–2023 Mack Lrbe (electric) — Power cables that connect to the windscreen heater relay…
- 2022–2023 Mack Lrbe (electric) — Coolant line in the high voltage battery pack may not be…
Other campaigns involving Mack vehicles
Source: NHTSA recall database, campaign 23V024000 (manufacturer number SC0440). Data last verified Jul 30, 2026.