Recall 11V423 covers 860 2011-2012 Blue Bird Vision and All American school buses for V-band clamp failure. Authorized Cummins dealers repair it free.
Blue Bird is recalling 860 2011-2012 Vision and All American school buses under recall 11V423 because V-band clamp T-bolts on Cummins diesel exhaust aftertreatment assemblies can fracture and loosen. Hot exhaust gases can vent before the tailpipe, raising fire risk, and Blue Bird dealer repairs will be free once available.
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What's wrong?
The V-band clamp on the 2011-2012 Blue Bird Vision and All American school buses is a metal band that holds sections of the diesel exhaust aftertreatment system together. That system includes the diesel oxidation catalyst and diesel particulate filter, which clean diesel exhaust before it leaves the bus. The clamp uses a T-bolt to tighten around the joint and keep the inlet and outlet cone sections attached to the housing.
On the recalled buses, the T-bolt in the clamp assembly can fracture when it is under stress or load. Once the bolt breaks, the clamp loses tension. That lets the inlet or outlet section attached to the diesel oxidation catalyst or diesel particulate filter housing loosen and disconnect.
There is no warning sign before failure. A driver or fleet technician should not rely on a sound, warning light, or drivability change to announce that the clamp is about to let go.
Who's affected?
Spans the Vision and All American bus platforms across the 2011 and 2012 model years, all tied to engine and engine cooling.
| 2011 Blue Bird Vision | Engine and engine cooling |
|---|---|
| 2011 Blue Bird All American | Engine and engine cooling |
| 2012 Blue Bird All American | Engine and engine cooling |
| 2012 Blue Bird Vision | Engine and engine cooling |
| Units affected | 860 |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
If an exhaust clamp disconnects, hot exhaust gases can vent before the tailpipe, creating a fire risk. If both clamps fail, the DOC or DPF housing can detach and become a road hazard. Drive cautiously, avoid unusual exhaust heat or noise, and schedule the recall repair. Repair will be free at any franchised Blue Bird dealer once available.
What should I do?
- Check your VIN to confirm your 2011-2012 Blue Bird Vision or All American school bus is included in this recall.
- Wait for Blue Bird or Cummins recall instructions before scheduling, since the remedy status is not listed as available in this record.
- Contact Blue Bird or Cummins customer service with questions about the free authorized Cummins dealer repair.
- Reference recall number 11V423 when you call about the V-band clamp repair that keeps hot exhaust gases routed through the tailpipe.
- Keep the bus out of service if the exhaust system is loose, damaged, or venting hot gases before the tailpipe.
What happens at the repair
Blue Bird worked with Cummins to identify and notify owners. At an authorized Cummins dealer, the technician handles the engine recall repair for the V-band clamp assembly that connects the inlet and outlet cone sections to the DOC and DPF housing. The recall repair is free, and the source says the safety recall began on October 10, 2011. The filing does not give a repair time or describe a separate reimbursement program.
Timeline
| August 17, 2011 | NHTSA published the recall |
|---|---|
| October 10, 2011 | Owner notification mailed |
Frequently asked questions
What is recall 11V423?
Recall 11V423 covers 860 2011-2012 Blue Bird Vision and All American school buses with Cummins diesel engines. The V-band clamp T-bolt on the DOC/DPF exhaust assembly can fracture, loosen the clamp, and let hot exhaust gases escape before the tailpipe.
What should I do if my 2011-2012 Blue Bird Vision or All American is on this recall?
Check your VIN to confirm your specific bus is included in recall 11V423. If it is, contact Blue Bird or an authorized Cummins dealer and reference recall 11V423. Blue Bird said the safety recall began on October 10, 2011, and the repair is free.
Is the recall repair free?
Yes. Federal recall law requires the recall repair to be performed at no cost. For recall 11V423, Blue Bird said repairs will be performed by authorized Cummins dealers free of charge.
What is the safety risk in recall 11V423?
The safety risk is fire and road debris. If the inlet or outlet sections disconnect, hot exhaust gases can vent before the tailpipe and create a fire risk. If both clamps fail, the DOC/DPF housing can detach completely and create a road hazard.
What if I bought this Blue Bird bus used?
The free recall repair still applies. Recall eligibility follows the VIN, not the first owner. Check your VIN to confirm whether your 2011-2012 Blue Bird Vision or All American is included, then reference recall 11V423 when you contact the repair provider.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/11V423000 |
|---|---|
| Blue Bird customer service | 1-812-377-5000 |
| NHTSA recall # | 11V423 |
| NHTSA recall # (full) | 11V423000 |
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 →