The defect
Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-2027 Anthem (4) vehicles. The rear brake modulators may have unprotected electrical connectors that can short circuit and lead to a loss of the anti-lock brake system (ABS) and electronic stability control (ESC).
The risk
A loss of anti-lock brakes and electronic stability control increases the risk of a crash or injury.
The remedy
Dealers will inspect the rear brake modulator electrical connectors, install a protective cover, and replace the rear brake modulators, as necessary, free of charge. Owner notification letters were mailed June 8, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0494. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning April 30, 2026.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Mack Anthem AN (4) | 2026, 2027 |
| Mack Pioneer PR (4) | 2025, 2026, 2027 |
Components: SERVICE BRAKES, AIR:ANTILOCK:CONTROL UNIT/MODULE
Model years in this recall
NHTSA complaints and the number of recall campaigns for each model year this recall covers.
| Model | Year | Complaints | Recalls |
|---|---|---|---|
| Mack Anthem AN (4) | 2026 | 0 | 4 |
| Mack Anthem AN (4) | 2027 | 0 | 6 |
| Mack Pioneer PR (4) | 2025 | 0 | 12 |
| Mack Pioneer PR (4) | 2026 | 0 | 9 |
| Mack Pioneer PR (4) | 2027 | 0 | 6 |
Other service brakes, air recalls in 2026
11 of the 666 recall campaigns reported to NHTSA in 2026 concerned the service brakes, air; Mack Trucks, Inc. filed 118 campaigns in all.
| 26V583000 9 Sept 2026 | Daimler Trucks North America, LLC |
| 26V567000 1 Sept 2026 | PACCAR Incorporated |
| 26V506000 4 Aug 2026 | Wabash National Corporation |
| 26V501000 30 Jul 2026 | Autocar, LLC |
| 26V442000 8 Jul 2026 | PACCAR Incorporated |
| 26V382000 11 Jun 2026 | International Motors, LLC |
| 26V355000 2 Jun 2026 | Nova Bus (US) Inc. |
| 26V294000 11 May 2026 | International Motors, LLC |
NHTSA recalls (public domain) · all recalls of 2026