Recall 20V660 covers 1,411 2020-2021 Freightliner Cascadia, 108SD, 114SD, Business Class M2, 4700, 4900, and 5700 vehicles for a spindle snap-ring defect. Repair is free at any franchised Freightliner dealer.
Freightliner is recalling 1,411 2020-2021 Cascadia, 108SD, 114SD, Business Class M2, and Western Star 4700, 4900, and 5700 vehicles because the left steer axle spindle nut snap-ring locking feature was installed incorrectly or is missing. The defect can lead to wheel-end failure or wheel separation, increasing crash risk, and the dealer repair is free.
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What's wrong?
The spindle is the fixed shaft at the wheel end of the steer axle on affected 2020-2021 Freightliner Cascadia, 108SD, 114SD, Business Class M2, 4700, 4900, and 5700 vehicles. The spindle nut holds the wheel-end bearings in place on that shaft. The snap-ring locking feature is supposed to keep that nut seated, so the wheel end stays clamped in the correct position.
On these trucks, the snap-ring on the left spindle nut was installed incorrectly or left out. DTNA traced the problem to axle assembly work where operators had not been fully trained on snap-ring installation. If the ring is not seated, the nut is no longer locked the way the axle was designed.
There is no warning sign before failure. The issue is inside the wheel-end hardware, so an owner or driver should not expect a dashboard light, noise, or handling change before the locking feature fails.
Who's affected?
Spans Freightliner and Western Star truck lines across the 2020 and 2021 model years, all tied to the rear suspension spindle.
| 2021 Freightliner Cascadia | rear suspension |
|---|---|
| 2020 Freightliner Cascadia | rear suspension |
| 2021 Western Star 4900 | rear suspension |
| 2021 Western Star 5700 | rear suspension |
| 2021 Freightliner 108SD | rear suspension |
| 2021 Freightliner 114SD | rear suspension |
| 2021 Freightliner Business Class M2 | rear suspension |
| 2021 Western Star 4700 | rear suspension |
| Units affected | 1,411 |
| Field incidents | NHTSA has logged 1 field incident to date. |
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?
A missing or improperly installed locking snap ring can let the wheel end fail and separate from the vehicle, increasing crash risk. If your VIN is included, schedule the inspection and repair soon and avoid extra trips until it is done. Repair is free at any franchised Freightliner dealer.
What should I do?
- Check your VIN to confirm your 2020-2021 Freightliner Cascadia, 4900, 5700, 108SD, 114SD, Business Class M2, or 4700 is included in this recall.
- Contact a franchised Freightliner dealer to schedule the free hub-cap-plug inspection and snap-ring repair that secures the steer axle spindle nut and addresses wheel-end separation risk.
- Bring the recall notice if Daimler Trucks mailed one. If not, reference recall number 20V660 when you call.
- Call Freightliner customer service at 1-800-547-0712 with questions about scheduling or dealer instructions.
- Drive cautiously until the inspection and repair are complete.
What happens at the repair
At the dealer, a Freightliner technician inspects the hub cap plug and checks the steer axle spindle nut snap-ring locking feature. If the snap-ring is missing or installed incorrectly, the technician reinstalls it or replaces it so the spindle nut locking feature is secured. The recall repair is free, and parts and labor are covered. Ask the service desk to reference DTNA recall FL-866 when scheduling the inspection and repair.
Timeline
| October 27, 2020 | NHTSA published the recall |
|---|---|
| December 18, 2020 | Owner notification mailed |
| December 24, 2020 | Dealer notification began |
| December 24, 2020 | Dealer notification ended |
| December 24, 2020 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 20V660?
Recall 20V660 covers 1,411 2020-2021 Freightliner trucks with a left steer axle spindle nut locking snap ring that is missing or installed incorrectly. That defect can lead to wheel-end failure and wheel separation, increasing crash risk. Dealers inspect the hub cap plug and repair the snap ring for free.
What should I do if my 2020-2021 Freightliner Cascadia, 108SD, 114SD, Business Class M2, 4700, 4900, or 5700 is on this recall?
Check your VIN to confirm your specific truck is included in recall 20V660. If it is, contact a franchised Freightliner dealer to schedule the hub cap plug inspection and snap ring repair. Reference recall number 20V660 or Freightliner recall FL-866 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the safety defect at no cost. For recall 20V660, the dealer will inspect the hub cap plug and reinstall or replace the snap ring as needed free of charge.
What is the safety risk?
The safety risk is wheel-end failure and wheel separation. The recall filing says a missing or improperly installed locking snap ring can allow the wheel end to fail, increasing crash risk. If your VIN is included, schedule the free dealer repair before putting the truck back into normal service.
What if I bought this truck used?
The free recall repair still applies. Recall coverage follows the VIN, not the first owner. Check your VIN to confirm whether your specific truck is included, then call a franchised Freightliner dealer and reference recall 20V660 or Freightliner recall FL-866.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/20V660000 |
|---|---|
| Freightliner customer service | 1-800-547-0712 |
| NHTSA recall # | 20V660 |
| NHTSA recall # (full) | 20V660000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Misc. Document (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 23, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →