Recall 13V634 covers 255 2009-2014 Freightliner Business Class M2, MT45, and MT55 vehicles for unintended acceleration. Software update is free at any franchised Freightliner dealer.
Freightliner recall 13V634 covers 255 2009-2014 MT55, MT45, and Business Class M2 vehicles equipped with Eaton hybrid automated transmissions because the transmission software can raise engine speed during downshifts without driver input. That unintended acceleration raises crash risk, and the Freightliner dealer repair will be free once available.
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What's wrong?
The Eaton hybrid automated transmission is supposed to shift gears and coordinate engine speed without the driver moving a clutch. In 2009-2014 Freightliner MT55, MT45, and Business Class M2 vehicles, the transmission software controls those downshifts and is supposed to match engine speed to the gear change.
The defect is in that control software. During a downshift, it can raise engine speed even though the driver has not pressed for more power. That unexpected increase happens as the transmission is shifting down, so the vehicle can respond in a way the driver did not request.
There is no warning sign before failure. Treat any unexpected engine speed increase during a downshift as part of the problem described in recall 13V634.
Who's affected?
Covers the MT55, MT45, and Business Class M2 across the 2009-2014 model years, all tied to the automatic transmission.
| 2014 Freightliner MT55 | automatic transmission |
|---|---|
| 2012 Freightliner MT55 | automatic transmission |
| 2009 Freightliner MT55 | automatic transmission |
| 2010 Freightliner MT55 | automatic transmission |
| 2009 Freightliner MT45 | automatic transmission |
| 2010 Freightliner MT45 | automatic transmission |
| 2013 Freightliner MT45 | automatic transmission |
| 2014 Freightliner MT45 | automatic transmission |
| 2009 Freightliner Business Class M2 | automatic transmission |
| 2011 Freightliner Business Class M2 | automatic transmission |
| 2013 Freightliner Business Class M2 | automatic transmission |
| 2013 Freightliner MT55 | automatic transmission |
| 2012 Freightliner MT45 | automatic transmission |
| 2010 Freightliner Business Class M2 | automatic transmission |
| 2011 Freightliner MT55 | automatic transmission |
| 2012 Freightliner Business Class M2 | automatic transmission |
| 2011 Freightliner MT45 | automatic transmission |
| 2014 Freightliner Business Class M2 | automatic transmission |
| Units affected | 255 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific truck.
What's the safety risk?
The increase in engine speed can lead to unintended acceleration, which increases the risk of a crash. If your VIN is included, drive cautiously, leave extra space, and contact a Freightliner dealer about the transmission software update. Repair will be free at any franchised Freightliner dealer once available.
What should I do?
- Check your VIN to confirm your 2009-2014 Freightliner MT55, MT45, or Business Class M2 is included in this recall.
- Contact a franchised Freightliner dealer and ask whether the free hybrid transmission software update is open for your vehicle.
- Reference recall number 13V634 when you call, and use Freightliner recall FL-657 if the service desk asks for the manufacturer number.
- Schedule the software update that corrects the downshift control problem tied to unintended acceleration.
- Drive cautiously until the update is complete. Leave extra space and be ready for increased engine speed during downshifts.
What happens at the repair
The filing identifies a dealer update to the hybrid transmission software. Once the repair is available for your VIN, a Freightliner technician updates the transmission control software so it no longer raises engine speed during downshifts without driver input. The dealer repair will be free once available, with parts and labor covered under recall 13V634. The source does not state a separate reimbursement program, so this section does not add one.
Timeline
| December 16, 2013 | NHTSA published the recall |
|---|---|
| February 5, 2014 | Owner notification mailed |
Frequently asked questions
What is recall 13V634?
Recall 13V634 covers 255 2009-2014 Freightliner MT55, MT45, and Business Class M2 chassis equipped with Eaton hybrid automated transmissions. The transmission software can raise engine speed during downshifts without driver input, increasing crash risk. Freightliner dealers update the hybrid transmission software for free.
What should I do if my 2009-2014 Freightliner MT55, MT45, or Business Class M2 is on this recall?
Check your VIN to confirm your specific chassis is included in recall 13V634. If it is, contact a franchised Freightliner dealer to schedule the hybrid transmission software update. Reference recall number 13V634 or Freightliner recall FL-657 when you call.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost. A franchised Freightliner dealer will update the hybrid transmission software free of charge, including the covered parts and labor for recall 13V634.
What is the safety risk?
The safety risk is unintended acceleration. In affected Freightliner chassis, the hybrid transmission software can raise engine speed during a downshift without driver input. That increase in engine speed increases crash risk. The fix is a free dealer software update.
When did the recall repair start?
The recall repair began on February 5, 2014. Freightliner dealers have been directed to update the hybrid transmission software for affected chassis at no cost. Check your VIN first, then call a franchised Freightliner dealer with recall number 13V634 or FL-657.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/13V634000 |
|---|---|
| Freightliner customer service | 1-503-745-6910 |
| NHTSA recall # | 13V634 |
| NHTSA recall # (full) | 13V634000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Recall Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (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 →