Recall 11V444 affects 87 2010-2011 Nabi 416 transit buses for V-band clamp T-bolt fractures. Repairs are free through authorized Cummins dealers.
Nabi is recalling 87 2010-2011 416 transit buses because a T-bolt in the V-band clamp assembly for the diesel oxidation catalyst and diesel particulate filter can fracture. If the clamp loosens, hot exhaust gases can vent before the tailpipe and create a fire risk; if both clamps fail, the housing can detach and create a road hazard, and the Nabi dealer repair will be free once available.
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What's wrong?
The exhaust system on 2010-2011 Nabi 416 transit buses uses a diesel oxidation catalyst and diesel particulate filter to treat diesel exhaust before it leaves the tailpipe. A V-band clamp assembly holds the inlet and outlet cone sections tight against that housing. The clamp has a T-bolt, which is the threaded fastener that supplies the clamping force.
On the affected buses, that T-bolt can fracture under stress or load. Once the bolt breaks, the clamp loses tension and no longer holds the cone section securely to the diesel oxidation catalyst and diesel particulate filter housing. The inlet or outlet section can then separate from the housing, leaving part of the exhaust after-treatment assembly disconnected.
There is no warning sign before failure. An operator or maintenance technician would notice the problem only after the clamp has loosened or the exhaust section has separated.
Who's affected?
The scope is confined to one 416 bus line across the 2010 and 2011 model years.
| 2010 Nabi 416 | Exhaust system |
|---|---|
| 2011 Nabi 416 | Exhaust system |
| Units affected | 87 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific bus.
What's the safety risk?
Disconnected inlet or outlet sections let hot exhaust gases vent before the tailpipe, creating a fire risk. If both clamps fail, the DOC/DPF housing can detach and become a road hazard. Schedule the repair promptly. Repair will be free at any franchised Nabi dealer once available.
What should I do?
- Check your VIN to confirm your 2010-2011 Nabi 416 is included in this recall.
- Contact Nabi or an authorized Cummins dealer for the free V-band clamp repair.
- Schedule the V-band clamp repair that keeps the DOC/DPF inlet and outlet sections connected so hot exhaust gases do not vent before the tailpipe.
- Bring the recall notice if you have it. If not, reference recall number 11V444 when you call.
- Avoid operating the bus until the exhaust clamp repair is complete if you smell exhaust, see loose exhaust parts, or find damage near the DOC/DPF housing.
What happens at the repair
Nabi is coordinating this recall with Cummins. The remedy does not name a specific part replacement step, but it identifies authorized Cummins dealers as the repair path for the V-band clamp assembly on the diesel oxidation catalyst and diesel particulate filter. The dealer checks the clamp connection at the inlet and outlet cone sections and performs the Cummins recall repair. Parts and labor are free under the recall once the repair is available through the authorized dealer network.
Timeline
| August 30, 2011 | NHTSA published the recall |
|---|---|
| October 10, 2011 | Owner notification mailed |
Frequently asked questions
What is recall 11V444?
Recall 11V444 covers 87 2010-2011 Nabi 416 transit buses with Cummins ISL diesel engines. The exhaust V-band clamp T-bolt can fracture, loosen the diesel oxidation catalyst or diesel particulate filter connections, and let hot exhaust gases escape. Authorized Cummins dealers perform the repair for free.
What should I do if my 2010-2011 Nabi 416 is on this recall?
Check your VIN to confirm your specific bus is included in recall 11V444. If it is, contact an authorized Cummins dealer for the exhaust clamp repair. Reference recall 11V444 when you call, and use Cummins customer service at 1-812-377-5000 if the dealer needs support.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and the Nabi remedy says authorized Cummins dealers perform the recall repair free of charge. Parts and labor are covered for buses included in recall 11V444.
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, creating a combustion and fire risk. If both clamps fail, the diesel oxidation catalyst or diesel particulate filter housing can detach and create a road hazard.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/11V444000 |
|---|---|
| Nabi customer service | 1-812-377-5000 |
| NHTSA recall # | 11V444 |
| NHTSA recall # (full) | 11V444000 |
Source documents
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 →