Mack LR: Electrical

Affects Mack LR · 2022 — about 5 vehicles.

The hazard

Issue: On a small number of LR Electric models, a relay for the coolant heater could fail. If this happens, the heater could stay energized when there is no coolant flow or a low coolant level. Safety Risk: A coolant heater that stays energized could create the risk of a fire. Corrective Actions: Mack will notify owners by mail and instruct you to take your truck to a dealership to update the hybrid powertrain control unit and instrument cluster software. The dealer will also install replacement relays.

What to do

Contact your dealer; the remedy details were not included in the filing.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational