Recall 16V099 affects 33,981 2012-2016 Mack trucks for a loose driveline cap nut. Repair is free at any franchised Mack dealer.
Mack is recalling 33,981 2012-2016 Granite (Gu), Pinnacle (Chu), Terrapro (Leu), Titan (Td), and Lr trucks under recall 16V099 because the cap nut holding the interaxle driveshaft yoke to the rear axle input shaft can loosen. If the yoke separates and the driveshaft disconnects, crash risk increases; Mack dealers will complete the repair free of charge.
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What's wrong?
The interaxle driveshaft on 2012-2016 Mack trucks carries engine power between the drive axles. At the rear axle input shaft, a yoke connects the shaft to the axle. A cap nut holds that yoke tight so the driveline stays aligned while the truck is pulling, braking, and turning.
On affected trucks, the cap nut that retains the yoke can loosen. Mack traced the problem to input shaft threads and patch-lock thread treatment that did not meet specification. Once the nut loses clamp force, the yoke no longer stays fixed on the rear axle input shaft. That movement can damage the joint and lead to driveshaft failure.
Owners can notice vibration or noise from the driveline before the failure. Treat that change as a warning sign, especially on Granite (Gu), Pinnacle (Chu), Pinnacle (Cxu), Terrapro (Leu), Terrapro (Mru), Titan (Td), and Lr trucks in the recalled year range.
Who's affected?
Spans 7 Mack truck lines across the 2012-2016 model years, all tied to the driveline.
| 2016 Mack Titan (Td) | driveline |
|---|---|
| 2014 Mack Pinnacle (Chu) | driveline |
| 2013 Mack Terrapro (Leu) | driveline |
| 2015 Mack Terrapro (Leu) | driveline |
| 2013 Mack Pinnacle (Chu) | driveline |
| 2012 Mack Pinnacle (Cxu) | driveline |
| 2015 Mack Granite (Gu) | driveline |
| 2015 Mack Terrapro (Mru) | driveline |
| 2015 Mack Lr | driveline |
| 2012 Mack Titan (Td) | driveline |
| 2015 Mack Pinnacle (Chu) | driveline |
| 2016 Mack Terrapro (Mru) | driveline |
| 2014 Mack Titan (Td) | driveline |
| 2013 Mack Terrapro (Mru) | driveline |
| 2014 Mack Terrapro (Mru) | driveline |
| 2012 Mack Terrapro (Leu) | driveline |
| 2014 Mack Terrapro (Leu) | driveline |
| 2013 Mack Granite (Gu) | driveline |
| 2012 Mack Granite (Gu) | driveline |
| 2012 Mack Pinnacle (Chu) | driveline |
| 2014 Mack Pinnacle (Cxu) | driveline |
| 2016 Mack Lr | driveline |
| 2013 Mack Titan (Td) | driveline |
| 2012 Mack Terrapro (Mru) | driveline |
| 2013 Mack Pinnacle (Cxu) | driveline |
| 2014 Mack Granite (Gu) | driveline |
| 2015 Mack Pinnacle (Cxu) | driveline |
| 2015 Mack Titan (Td) | driveline |
| 2016 Mack Granite (Gu) | driveline |
| Units affected | 33,981 |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
If the cap nut loosens and falls off, the yoke can separate from the axle input shaft. That can let the drive shaft disconnect and increase crash risk. Vibration or noise is the warning sign. If you feel vibration or hear noise, stop when safe and call a Mack dealer. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2012-2016 Mack Titan (Td), Pinnacle (Chu), Terrapro (Leu), Pinnacle (Cxu), Granite (Gu), Terrapro (Mru), or Lr truck is included in this recall.
- Contact a franchised Mack dealer to schedule the free cap-nut replacement and input-shaft inspection that keeps the interaxle driveshaft yoke secured.
- Reference recall number 16V099 when you call, and bring the recall notice if Mack mailed one.
- Ask the dealer whether the truck needs any added driving limits before the repair is complete.
What happens at the repair
At the dealer, a Mack technician replaces the cap nut that holds the interaxle driveshaft yoke to the rear axle input shaft. The technician also inspects the input shaft threads for damage and replaces the input shaft if damage is found. These repairs are free under recall 16V099, including parts and labor. Mack handles repairs paid before the owner notice through the manufacturer's standard reimbursement plan. If you already paid for a related cap nut, driveshaft yoke, or input shaft repair, contact Mack customer service or the dealer service desk with your repair documentation.
| Reimbursement | Reimbursement available |
|---|
Timeline
| February 19, 2016 | NHTSA published the recall |
|---|---|
| February 23, 2016 | Dealer notification began |
| February 23, 2016 | Dealer notification ended |
| April 15, 2016 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| April 15, 2016 | Interim owner notification (was planned for this date) |
| June 7, 2016 | Owner notification mailed |
Frequently asked questions
What is recall 16V099?
Recall 16V099 covers 33,981 2012-2016 Mack Granite (Gu), Pinnacle (Chu), Pinnacle (Cxu), Terrapro (Leu), Terrapro (Mru), Titan (Td), and Lr trucks. The cap nut that holds the interaxle driveshaft yoke to the rear axle input shaft can loosen, letting the driveshaft disconnect and increasing crash risk.
What should I do if my 2012-2016 Mack Granite (Gu), Pinnacle (Chu), Pinnacle (Cxu), Terrapro (Leu), Terrapro (Mru), Titan (Td), or Lr is on this recall?
Check your VIN to confirm your specific truck is included in recall 16V099. If it is, contact a franchised Mack dealer to schedule the cap nut replacement and input shaft thread inspection. Reference recall number 16V099 or Mack recall SC0399 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Mack says dealers will replace the cap nut, inspect the input shaft threads, and replace any damaged input shaft free of charge.
Is it safe to drive a Mack truck with this recall?
The safety risk is a driveshaft disconnect while driving. If the cap nut loosens and falls off, the yoke can separate from the axle input shaft, increasing crash risk. Confirm your VIN, then ask the Mack dealer whether the truck needs any driving limits before repair.
What if I bought the Mack truck used?
The free recall repair still applies. Recall coverage follows the VIN, not the first owner. If you bought the truck used and never received a notice, check your VIN and give recall number 16V099 or Mack recall SC0399 to the dealer service desk.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/16V099000 |
|---|---|
| Mack customer service | 1-610-709-2131 |
| NHTSA recall # | 16V099 |
| NHTSA recall # (full) | 16V099000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Recall Document (PDF) (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Document (PDF) (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Quarterly Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 31, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →