Recall 11V421 affects 96 2010 Orion Vii buses for a DOC/DPF clamp T-bolt fracture. Repair is free at any franchised Orion dealer.
Orion is recalling 96 2010 Vii transit buses because the V-band clamp T-bolt on the diesel oxidation catalyst and diesel particulate filter can fracture under stress. If the clamp loosens, hot exhaust gases can vent before the tailpipe, which raises fire risk, and the dealer repair will be free once available.
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What's wrong?
The V-band clamp on the 2010 Orion Vii transit bus is a metal band that holds exhaust-treatment sections tightly together. On buses with Cummins ISB, ISX, ISC, or ISL diesel engines, these clamps connect the inlet and outlet cone sections to the diesel oxidation catalyst and diesel particulate filter, the parts that help clean diesel exhaust before it leaves the bus.
The problem is inside the clamp assembly. The T-bolt, the small threaded fastener that tightens the clamp, can fracture when it is under stress or load. Once that bolt breaks, the clamp loosens and the inlet or outlet section attached to the DOC/DPF housing can disconnect from the exhaust system.
There is no warning sign before failure. An owner or fleet technician would not have a clear driver warning before the clamp loses its hold, so the affected clamp assembly needs dealer attention under recall 11V421.
Who's affected?
| 2010 Orion Vii | Engine and engine cooling |
|---|---|
| Units affected | 96 |
Not every 2010 Orion Vii bus is on the list. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
Hot exhaust gases venting before the tailpipe creates a fire risk. If both clamps fail, the DOC/DPF housing can detach and become a road hazard. Schedule the recall repair soon and avoid delaying service. Repair will be free at any franchised Orion dealer once available.
What should I do?
- Check your VIN to confirm your 2010 Orion Vii transit bus is included in this recall.
- Call Cummins at 1-812-377-5000 to confirm the free repair path for the exhaust V-band clamp T-bolt failure.
- Schedule the V-band clamp repair with an authorized Cummins dealer so hot exhaust gases do not vent near the DOC or DPF housing.
- Bring the recall notice if Orion has mailed one. If not, reference recall number 11V421 when you call.
- Keep the bus out of service if exhaust parts are loose, separated, or showing heat damage until the repair is complete.
What happens at the repair
DBNA worked with Cummins to identify and notify Orion owners for this campaign. The remedy directs owners to authorized Cummins dealers, where the technician handles the recall repair at no charge. The source does not give a separate step-by-step replacement description, but the repair centers on the V-band clamp assembly and the T-bolt that secures the cone sections to the diesel oxidation catalyst and diesel particulate filter housing. The dealer repair will be free once available.
Timeline
| August 15, 2011 | NHTSA published the recall |
|---|---|
| October 10, 2011 | Owner notification mailed |
Frequently asked questions
What is recall 11V421?
Recall 11V421 covers 96 2010 Orion Vii transit buses with Cummins diesel engines and a V-band clamp T-bolt that can fracture. If the clamp loosens, hot exhaust gases can vent before the tailpipe, creating fire risk. Authorized Cummins dealers perform the repair for free.
What should I do if my 2010 Orion Vii is on this recall?
Check your VIN to confirm your specific bus is included in recall 11V421. If it is, contact an authorized Cummins dealer to arrange the V-band clamp repair. Reference recall number 11V421 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and the recall remedy says authorized Cummins dealers perform this repair free of charge. The repair path is through an authorized Cummins dealer.
What is the safety risk?
The safety risk is fire or a road hazard. If the inlet or outlet sections disconnect, hot exhaust gases can vent before leaving the tailpipe. If both clamps fail, the DOC/DPF housing can detach completely and create a road hazard.
When did the Orion Vii recall repair begin?
The safety recall began on October 12, 2011. If your VIN is included and the repair has not been completed, contact an authorized Cummins dealer and reference recall number 11V421 when you schedule service.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/11V421000 |
|---|---|
| Orion customer service | 1-812-377-5000 |
| NHTSA recall # | 11V421 |
| NHTSA recall # (full) | 11V421000 |
Source documents
-
Download Recall Document (PDF) (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 →