Mack Pioneer PR (4), Pinnacle (Pi/Pn) +3 more: Electrical system — software

Affects Mack Pioneer PR (4), Pinnacle (Pi/Pn), Terrapro (Te), Anthem (An), Granite (Gr) · 2020–2025 — about 59K vehicles.

The hazard

Safety systems that depend on the ECU (Automatic Traction Control, ABS, Electronic Stability Control, Active Cruise Control, and Collison Mitigation System) may have diminished or lost functionality, increasing the risk of a crash.

What to do

Dealers will reprogram the ECU software, free of charge. Owner notification letters were mailed December 9, 2024. Owners may contact Mack customer service at 1-800-866-1177. Mack's number for this recall is SC0472.

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