The defect
Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2027 Anthem (4) trailers. The trailer turn signals may not function properly. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
The risk
Turn signals that do not function properly may fail to indicate the driver's intention to change vehicle direction, increasing the risk of a crash.
The remedy
Dealers will update the turn signal indicator software, free of charge. Owner notification letters were mailed May 7, 2026. Owners may contact Mack's customer service at 1-800-866-1177. Mack's number for this recall is SC0493. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov April 1, 2026.
NHTSA's own wording · initiated by MFR
Vehicles covered
| Model | Model years |
|---|---|
| Mack Anthem AN (4) | 2027 |
| Mack Pioneer PR (4) | 2025, 2026, 2027 |
Components: EXTERIOR LIGHTING:TURN SIGNAL
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) | 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 exterior lighting recalls in 2026
32 of the 666 recall campaigns reported to NHTSA in 2026 concerned the exterior lighting; Mack Trucks, Inc. filed 118 campaigns in all.
| 26V632000 1 Oct 2026 | Daimler Trucks North America, LLC |
| 26V606000 22 Sept 2026 | Ford Motor Company |
| 26V513000 6 Aug 2026 | Volvo Trucks North America |
| 26V515000 6 Aug 2026 | Mack Trucks, Inc. |
| 26V508000 5 Aug 2026 | Rivian Automotive, LLC |
| 26V507000 4 Aug 2026 | Tesla, Inc. |
| 26V484000 27 Jul 2026 | Jayco, Inc. |
| 26V486000 27 Jul 2026 | Foretravel, Inc. |
NHTSA recalls (public domain) · all recalls of 2026