Recall 26V509 covers 341 2025 Mack Terrapro (Te) trucks with steering gearbox fasteners that can loosen. Free repair at a franchised Mack dealer once available.
Mack is recalling 341 2025 Terrapro (Te) trucks because the steering gearbox fasteners can loosen. A loose gearbox can cause loss of steering and increase crash risk; the Mack dealer repair will be free once it becomes available.
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What's wrong?
The steering gearbox on the 2025 Mack Terrapro (Te) translates steering-wheel movement into the force that turns the front wheels. Hexagon screws secure the gearbox to its mounting bracket, holding it firmly in position while the truck is steered.
On affected trucks, these fasteners can loosen and lose the clamping force that keeps the gearbox fixed to its mount. A loose gearbox can move at the joint instead of transferring every steering input directly to the wheels. Mack found unusual flattening in some fastener torque curves, but no production pattern was identified. The underlying cause remains under investigation.
An operator can notice a change in steering responsiveness or feel the truck wandering while driving. Either sign can indicate that the steering gearbox fasteners have loosened.
Who's affected?
VINs become searchable on August 13, 2026. Until then, the VIN-by-VIN list is not public.
| 2025 Mack Terrapro (Te) | steering gear |
|---|---|
| 2025 Mack Terrapro (Te) | steering system |
| Units affected | 341 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not confirm inclusion. Once VINs are searchable, check your VIN to confirm whether your specific truck is included.
What's the safety risk?
A loose steering gearbox can cause loss of steering and increase the risk of a crash. If the vehicle wanders or steering responsiveness changes, stop in a safe place and contact the dealer. Schedule the repair soon. Repair will be free at any franchised Mack dealer once available.
What should I do?
- Check your VIN to confirm your 2025 Mack Terrapro (Te) is included in this recall.
- Wait for Mack's owner notification before scheduling the repair.
- Contact a franchised Mack dealer after the notice arrives to arrange the free inspection and fastener service that secures the steering gearbox and prevents loss of steering.
- Bring the recall notice to the dealer, or reference recall number 26V509 when you call.
What happens at the repair
Once the recall repair becomes available, a Mack technician will inspect the steering gearbox fasteners and tighten or replace them as needed. The repair, including parts and labor, will be free. Mack uses its standard reimbursement plan for related repairs paid before the recall. If you've already paid for this work, contact Mack and provide your repair invoice and payment documentation to request reimbursement.
| Reimbursement | Reimbursement available |
|---|
Timeline
| August 6, 2026 | NHTSA published the recall |
|---|---|
| August 13, 2026 | Dealer notification began |
| August 13, 2026 | Dealer notification ended |
| August 13, 2026 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
Frequently asked questions
What is recall 26V509?
Recall 26V509 covers 341 2025 Mack Terrapro (Te) trucks. Steering gearbox fasteners can loosen, allowing the gearbox to move and causing a loss of steering. Mack dealers will inspect the fasteners and tighten or replace them for free.
What should I do if my 2025 Mack Terrapro (Te) is on this recall?
Check your VIN to confirm your specific truck is included in recall 26V509. If it is, contact a franchised Mack dealer about scheduling the fastener inspection. The dealer will tighten or replace the fasteners as necessary at no charge.
Is the recall repair free?
Yes. Mack's recall remedy provides the inspection and any necessary tightening or replacement of the steering gearbox fasteners free of charge. A franchised Mack dealer will complete the work at no cost to the owner.
What is the safety risk?
NHTSA campaign 26V509 identifies a risk of losing steering control. Loose steering gearbox fasteners can allow the gearbox to move, resulting in a loss of steering and increasing the risk of a crash. The dealer repair is free.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/26V509000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 26V509 |
| NHTSA recall # (full) | 26V509000 |
Source documents
This article is generated from NHTSA's primary recall filings and reviewed against the source on August 10, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →