2025-2027 Mack Pioneer PR (4), 2026-2027 Mack Anthem AN (4) recall: Rear Brake Modulators May Short Circuit
Report received by NHTSA: April 23, 2026.
Built by the Tribune's code from NHTSA's official records. No AI wrote this page. Updated Nov. 4, 2026.
- What's recalled
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.
- Who's affected
2,772 vehicles potentially affected, according to NHTSA. Models: 2025-2027 Mack Pioneer PR (4), 2026-2027 Mack Anthem AN (4).
- Compared with
Mack Trucks, Inc. has 9 NHTSA recalls in 2026 so far, compared with 17 in all of 2025.
Counted by the Tribune from NHTSA's records since Nov. 1, 2016.
- Before this
80 earlier NHTSA recalls by Mack Trucks, Inc. since Nov. 1, 2016; the 5 most recent:
- April 1, 2026 2025-2027 Mack Pioneer PR (4), 2027 Mack Anthem AN (4) recall: Turn Signal Failure/FMVSS 108
- March 11, 2026 2022-2027 Mack Terrapro (te) recall: ECU Software Error May Cause Unexpected Vehicle Movement/FMVSS 102
- Dec. 15, 2025 2010-2016 Mack Granite (gu) recall: Rear Brakes May Overheat (agency record)
- Nov. 20, 2025 2025-2026 Mack Pioneer PR (4), 2026 Mack Anthem AN (4) recall: High Beams May Not Automatically Switch to Low Beams/FMVSS 108 (agency record)
- Nov. 20, 2025 2025-2026 Mack Pioneer PR (4) recall: Load Lock Clamps May Fail (agency record)
Counted by the Tribune from NHTSA's records since Nov. 1, 2016.
- What to do and when
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 record, word for word
- Check it yourself
NHTSA's VIN lookup shows whether a specific vehicle has an open recall.
Models in this recall
- Mack Anthem AN (4) 2026-2027
- Mack Pioneer PR (4) 2025-2027
The record as NHTSA published it
| NHTSA recall number | 26V261000 |
|---|---|
| Manufacturer | Mack Trucks, Inc. |
| Recall type | Vehicle |
| Component | SERVICE BRAKES, AIR |
| Report received by NHTSA | April 23, 2026 |
| Potentially affected | 2,772 vehicles |
| Manufacturer's recall number | SC0494 |
| “Do not drive” warning | No |
| Fire risk when parked (“park outside”) | No |
Source: National Highway Traffic Safety Administration recall records (public domain). NHTSA's record