Vehicle recall 11V485000 · September 23, 2011

Tiffin Allegro Bus and Phaeton

The v-band clamp assembly, part numbers Q187684, Q187685, and Q187686, used to connect the inlet and outlet cone sections to the diesel oxidation catalyst (doc)/diesel…

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

Summary: Tiffin motorhomes is recalling certain model year 2011 allegro bus and phaeton recreational vehicles built on the powerglide chassis equipped with a cummins isx or isl diesel engine. The v-band clamp assembly, part numbers Q187684, Q187685, and Q187686, used to connect the inlet and outlet cone sections to the diesel oxidation catalyst (doc)/diesel particulate filter (DPF) include a t-bolt which can fracture and fail when subjected to stress or load. A fracture or failure of the t-bolt may cause the clamp to loosen and the inlet or outlet sections attached to the doc/DPF housing to disconnect.
Consequence: If the inlet or outlet sections disconnect, hot exhaust gases can vent prior to exiting the tailpipe, creating the risk of combustion and a fire. If both clamps fail, there is a risk in some applications that the doc/DPF housing may detach completely, creating a road hazard.
Remedy: Tiffin motorhomes is working with cummins to identify and notify owners of the recall campaign. Repairs will be performed by authorized cummins dealers free of charge. The safety recall began on October 10, 2011. Owners may contact cummins at 1-812-377-5000 or tiffin motorhomes at 1-256-356-8661.
Notes: Cummins' recall campaign number is C1154.OWNERS may also contact the national highway traffic safety administration's vehicle safety hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to http://www.safercar.gov.

Recall details

NHTSA campaign: 11V485000
Reported to NHTSA: September 23, 2011
Filed by: TIFFIN MOTORHOMES, INC.
Owner notification: October 10, 2011
Vehicles potentially affected: 179
Initiated by: the manufacturer
Components: Engine and engine cooling

Recall 11V485000 on nhtsa.gov, with the manufacturer’s documents

Vehicles covered

As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.

Tiffin Allegro Bus (2011): 2011
Tiffin Phaeton (2011): 2011

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