Recall 11V547 covers 279 2011 Tiffin Phaeton and Allegro motorhomes with V-band clamps that can loosen. Authorized Cummins dealers repair it free.
Tiffin is recalling 279 2011 Phaeton and Allegro motorhomes because a T-bolt in the exhaust aftertreatment V-band clamp can fracture under stress. If the clamp loosens, hot exhaust gases can vent before the tailpipe and raise the risk of fire; the Tiffin dealer repair will be free once available.
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What's wrong?
The V-band clamp assembly on affected 2011 Tiffin Phaeton and Allegro motorhomes sits in the exhaust aftertreatment system on the diesel engine. It wraps around the joint where the inlet and outlet cone sections attach to the diesel oxidation catalyst and diesel particulate filter, the exhaust devices that help clean soot and emissions before exhaust leaves the vehicle. The clamp's job is to hold those heavy exhaust sections tightly against the DOC and DPF housing.
The problem is the T-bolt in the clamp. That bolt supplies the clamping force, and on these motorhomes it can fracture under stress or load. Once the T-bolt breaks, the clamp loses tension. The inlet or outlet cone section attached to the DOC or DPF housing can loosen and disconnect from the housing.
There is no warning sign before failure. If you hear a new exhaust noise or see looseness around the exhaust aftertreatment housing, ask a Tiffin dealer to inspect the clamp and connected exhaust sections.
Who's affected?
Covers the Phaeton and Allegro motorhome lines under the same engine and engine cooling component category.
| 2011 Tiffin Phaeton | Engine and engine cooling |
|---|---|
| 2011 Tiffin Allegro | Engine and engine cooling |
| Units affected | 279 |
The year and model narrow the scope, but the VIN decides. Check your VIN to confirm whether your specific motorhome is included.
What's the safety risk?
Disconnected exhaust sections can vent hot exhaust gases before they leave the tailpipe, creating the risk of combustion and fire. If both clamps fail, the DOC/DPF housing can detach completely and create a road hazard. Drive cautiously and schedule the repair soon. Repair will be free at any franchised Tiffin dealer once available.
What should I do?
- Check your VIN to confirm your 2011 Tiffin Phaeton or Allegro is included in this recall.
- Contact Tiffin or Cummins to confirm the authorized Cummins repair location for your motorhome.
- Schedule the free V-band clamp repair that keeps the DOC/DPF exhaust sections attached.
- Reference recall number 11V547 when you call, and bring the recall notice if you have it.
- Avoid operating the motorhome until the exhaust clamp repair is complete if you smell exhaust, see loose exhaust parts, or suspect heat damage.
What happens at the repair
The listed repair path runs through authorized Cummins dealers. Tiffin is working with Cummins to identify and notify owners, and the dealer repair will be free once available. At the authorized Cummins dealer, the repair addresses the V-band clamp assembly that connects the inlet and outlet cone sections to the DOC and DPF housing. The technician checks the affected clamp hardware and completes the Cummins recall repair at no charge to the owner.
Timeline
| October 10, 2011 | Owner notification mailed |
|---|---|
| November 10, 2011 | NHTSA published the recall |
Frequently asked questions
What is recall 11V547?
Recall 11V547 covers 279 2011 Tiffin Phaeton and Allegro motorhomes built on Freightliner chassis with certain Cummins diesel engines. The V-band clamp T-bolt can fracture, letting exhaust sections loosen or disconnect. Authorized Cummins dealers perform the recall repair for free.
What should I do if my 2011 Tiffin Phaeton or Allegro is on this recall?
Check your VIN to confirm your specific motorhome is included in recall 11V547. If it is, contact an authorized Cummins dealer to schedule the V-band clamp repair. Reference recall number 11V547 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 Tiffin remedy says authorized Cummins dealers perform this repair free of charge. Parts and labor are covered for included vehicles.
What is the safety risk in recall 11V547?
The risk is fire or a road hazard. If the exhaust inlet or outlet sections disconnect, hot exhaust gases can vent before the tailpipe and create a fire risk. If both clamps fail, the DOC or DPF housing can detach and create a road hazard.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/11V547000 |
|---|---|
| Tiffin customer service | 1-812-377-5000 |
| NHTSA recall # | 11V547 |
| NHTSA recall # (full) | 11V547000 |
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 →