Recall 12V407 covers 535 2013 Kenworth T400, T600, T700, T800, and W900 trucks for loose driveline fasteners. Repair is free at any franchised Kenworth dealer.
Kenworth is recalling 535 2013 T600, T700, T400, T800, and W900 trucks because driveline cap screws were not properly torqued. A separated driveline can disable the truck, increase crash risk, and become a road hazard; the dealer repair will be free once available.
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What's wrong?
The driveline on 2013 Kenworth T600, T700, T400, T800, and W900 trucks carries engine power from the transmission toward the drive axles. Cap screws are the heavy fasteners that clamp the driveline connections in place. They hold the main driveline to the forward rear axle and also secure the inter-axle driveline between rear axles.
On the recalled trucks, those cap screws were not torqued properly during assembly. Torque is the measured tightening force on a fastener. When that force is too low or uneven, the screws can loosen under normal driveline load and vibration. A loose driveline connection no longer holds the shaft in the exact position the power train needs.
There is no warning sign before failure. The recall does not list a specific noise, warning light, or change in driving feel that owners can rely on before the fasteners loosen.
Who's affected?
Covers five Kenworth truck models from the 2013 model year, all tied to the driveline.
| 2013 Kenworth T600 | driveline |
|---|---|
| 2013 Kenworth T700 | driveline |
| 2013 Kenworth T400 | driveline |
| 2013 Kenworth T800 | driveline |
| 2013 Kenworth W900 | driveline |
| Units affected | 535 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific truck is included.
What's the safety risk?
Improperly torqued driveline fasteners can let the driveline separate from the vehicle, disabling it and increasing crash risk. A separated component also creates a road hazard for other drivers if it lands in traffic. Schedule the inspection and re-torque work promptly. Repair will be free at any franchised Kenworth dealer once available.
What should I do?
- Check your VIN to confirm your 2013 Kenworth T600, T700, T400, T800, or W900 is included in this recall.
- Contact your nearest franchised Kenworth dealer to confirm the free repair path for recall number 12V407.
- Ask the dealer to inspect and re-torque the driveline cap screws that secure the main driveline and inter-axle driveline.
- Bring the recall notice if Kenworth mailed one, or give the dealer recall number 12V407 when you call.
- Avoid driving with driveline vibration, noise, or loss of power, and have the truck checked before returning it to service.
What happens at the repair
At the dealer, a Kenworth technician inspects the cap screws securing the main driveline to the forward rear axle and the cap screws on the inter-axle driveline. The technician re-torques each affected fastener so the driveline hardware is secured to specification. The dealer repair will be free once available, with parts and labor covered under recall 12V407. Ask the service desk to confirm the fastener inspection is complete before the truck returns to service.
Timeline
| August 20, 2012 | NHTSA published the recall |
|---|---|
| September 7, 2012 | Owner notification mailed |
Frequently asked questions
What is recall 12V407?
Recall 12V407 covers 535 2013 Kenworth T600, T700, T400, T800, and W900 vehicles with driveline fasteners that were not tightened to specification. The fasteners can loosen, let the driveline separate, disable the vehicle, and create a road hazard.
What should I do if my 2013 Kenworth T600, T700, T400, T800, or W900 is on this recall?
Check your VIN to confirm your specific truck is included in recall 12V407. If it is, call a franchised Kenworth dealer and ask for the driveline fastener inspection and re-torque. Reference recall number 12V407 when you schedule service.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Kenworth dealers will inspect and re-torque the affected driveline fasteners free of charge. Parts and labor are covered for included vehicles.
What is the safety risk?
The safety risk is driveline separation. Fasteners that are not tightened to specification can let the driveline separate from the truck, disable the vehicle, increase crash risk, and leave the separated component as a road hazard.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/12V407000 |
|---|---|
| Kenworth customer service | 1-425-828-5440 |
| NHTSA recall # | 12V407 |
| NHTSA recall # (full) | 12V407000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Owner Notification Letter (PDF)
- Download Defect / Noncompliance Notice (PDF) (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on June 2, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →