DEF sensor was faulty and could have caused vehicle to not exceed 5MPH. If it had happened on an interstate or other major highway, it would be a major safety concern! The DEF sensor had to be replaced. My understanding is that this can also be caused by surpassing the DEF fluid "shelf life" and, unlike diesel trucks, motorhomes are often stationary for extended periods. The failure was indicated by warning lights in the dash. If the DEF sensor goes bad in a motorhome, the engine should still perform until the sensor can be repaired or replaced. The 5MPH limitation is a SAFETY HAZARD!

NHTSA ODI #11442277

Official recalls

18V341000 · Structure:body:door

May 25, 2018

Tiffin Motorhomes, Inc. (Tiffin) is recalling certain 2018-2019 Tiffin Allegro RED, Allegro Open Road, Breeze, Bus, Phaeton, and Zephyr motorhomes. The entry door on these vehicles may have been improperly assembled, allowing the door to open while the vehicle is moving.

Consequence & remedy

Consequence: If the door comes open while the motorhome is moving, there is an increased risk of injury to the motorhome occupants.

Remedy: Tiffin will notify owners, and dealers will adjust the door lock mechanism, free of charge. The recall began on June 18, 2018. Owners may contact Tiffin customer service at 1-256-356-8661. Tiffin's number for this recall is TIF-110.

Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗

NHTSA investigations

No exact-year investigations in this snapshot.