Recall 11V457 covers 10 2011 Mci E4500 and J4500 motor coaches for V-band clamp T-bolt failure. Repair is free at authorized Cummins dealers.
Mci is recalling 10 model year 2011 E4500 and J4500 motor coaches because a V-band clamp T-bolt on the diesel exhaust system can fracture and let exhaust sections disconnect. Hot exhaust gas can vent before the tailpipe, creating fire risk, and the dealer repair will be free once Mci makes it available.
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What's wrong?
The recalled part on the 2011 Mci E4500 and J4500 motor coaches is a V-band clamp assembly in the exhaust aftertreatment system. That clamp holds the inlet and outlet cone sections to the diesel oxidation catalyst and diesel particulate filter, the DOC/DPF unit that helps clean diesel exhaust before it leaves the coach.
The weak point is the T-bolt inside the clamp assembly. The recall covers T-bolts that can fracture and fail when the clamp is under stress or load. Once that bolt breaks, the clamp loses its hold. The inlet or outlet section attached to the DOC/DPF housing can loosen and disconnect from the exhaust aftertreatment housing.
There is no warning sign before failure. If the clamp lets go, the exhaust connection is no longer secure, and the coach needs inspection before it returns to service.
Who's affected?
Both listed models use the same engine and engine cooling component category in this recall.
| 2011 Mci E4500 | Engine and engine cooling |
|---|---|
| 2011 Mci J4500 | Engine and engine cooling |
| Units affected | 10 |
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?
A disconnected inlet or outlet lets hot exhaust gases vent before the tailpipe, creating a fire risk. If both clamps fail, the DOC/DPF housing can detach completely and become a road hazard. Schedule the recall work promptly. Repair will be free at any franchised Mci dealer once available.
What should I do?
- Check your VIN to confirm your 2011 Mci E4500 or J4500 is included in this recall.
- Contact Mci at 1-800-241-2947 for current repair instructions and authorized Cummins dealer routing.
- Ask for the free V-band clamp repair that keeps the DOC/DPF exhaust sections attached and helps prevent hot exhaust gases from venting near the coach.
- Reference recall number 11V457 when you call Mci or the repair dealer.
- Avoid operating the coach until Mci confirms the repair path, since a loose exhaust section creates fire risk and road-hazard risk.
What happens at the repair
Mci's source remedy says authorized Cummins dealers perform the recall repair free of charge, and the safety recall began on September 19, 2011. At the dealer, the repair addresses the V-band clamp assembly that connects the inlet and outlet cone sections to the diesel oxidation catalyst and diesel particulate filter housing. The issue is the T-bolt in the clamp assembly, which can fracture under stress and let the clamp loosen. Parts and labor are covered under the recall.
Timeline
| August 31, 2011 | NHTSA published the recall |
|---|---|
| September 19, 2011 | Owner notification mailed |
Frequently asked questions
What is recall 11V457?
Recall 11V457 covers 10 2011 Mci E4500 and J4500 motor coaches with Cummins ISX 11.9 diesel engines. A V-band clamp T-bolt can fracture, loosen the exhaust connection at the DOC/DPF housing, and allow hot exhaust gases or parts to separate. The repair is free.
What should I do if my 2011 Mci E4500 or J4500 is on this recall?
Check your VIN to confirm your specific coach is included in recall 11V457. If it is, contact Mci or a franchised service location and reference recall number 11V457. Mci says repairs are performed by authorized Cummins dealers free of charge.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the safety defect at no cost, and Mci says authorized Cummins dealers will perform this recall repair free of charge. Have recall number 11V457 ready when you call for scheduling.
What is the safety risk on recall 11V457?
The safety risk is fire or a road hazard. If an exhaust clamp T-bolt fractures, hot exhaust gases can vent before the tailpipe, creating a combustion and fire risk. If both clamps fail, the DOC/DPF housing can detach and create a road hazard. The dealer repair is free.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/11V457000 |
|---|---|
| Mci customer service | 1-800-241-2947 |
| NHTSA recall # | 11V457 |
| NHTSA recall # (full) | 11V457000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Recall Document (PDF) (PDF)
- Download Owner Notification Letter (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 →