DEF "Head" sensor failure resulting in power reduction to 5%. Due to faulty def head sensors the vehicle will experience power loss dropping to 5% load. These sensors do nothing but measure DEF fluid level and temperature in it's tank. DEF continues to be supplied to the exhaust meeting all EPA regulations in place at this time, BUT the Engine ECU will shut you down leaving you stranded. Problems with micro chip shortages have left many stranded with nothing in place to help them get "home".. We are talking weeks to Months in some cases only to have the def head finally replaced only to fail again with in a couple thousand miles. Emissions are not effected, but "Shaw Development" (DEF Head manufacturer ) Nor Cummins (engine manufacturer) has not done anything to prompt the EPA to allow a work around for this problem. Emergency Response vehicles do have programing in their ECU which allow them to operate normally until new parts are available. Why not for the thousands of Motor Home owners as well as over the road trucks which are effected as well. It's not a question of if this will happen, it's a question of when this will happen.
The worst 2020 Tiffin Bus problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Engine1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Engine1
Recalls 3
Fuel system, diesel: fuel injection system: fuel rail
- What is wrong
- Tiffin Motorhomes, Inc. (Tiffin) is recalling certain 2017-2021 Bus and Phaeton vehicles. The sealing washer may not seat correctly in the pilot bore, allowing the high pressure fuel rail assembly to leak.
- Risk
- A fuel leak in the presence of an ignition source increases the risk of a fire.
- Remedy
- Tiffin will work with Cummins to inspect the rail threads , and replace the rail and fuel lines if damage is found, free of charge. Owner notification letters were mailed August 11, 2021. Owners may contact Tiffin customer service at 1‑256‑356‑8661.
Recall number 21V306000 · Recall details
Steering
- What is wrong
- Tiffin Motorhomes, Inc. (Tiffin) is recalling certain 2020 Bus and Phaeton motorhomes. The steering pinch bolts may not have been properly tightened.
- Risk
- A loose steering pinch bolt can result in a loss of steering control, increasing the risk of a crash.
- Remedy
- Tiffin will notify owners, and dealers will tighten the steering bolts to specification, free of charge. The recall began August 27, 2020. Owners may contact Tiffin customer service at 1‑256‑356‑8661.
Recall number 20V534000 · Recall details
Visibility/wiper
- What is wrong
- Tiffin Motorhomes, Inc. (Tiffin) is recalling certain 2019-2020 Tiffin Bus and 2018-2020 Zephyr motorhomes. The windshield wipers may not work due to the control module being improperly wired.
- Risk
- The wipers may stop working during inclement weather, causing limited visibility, increasing the risk of a crash.
- Remedy
- Tiffin will notify owners, and dealers will inspect the control module, correcting the wiring as needed, free of charge. The recall began August 13, 2020. Owners may contact Tiffin customer service at 1‑256‑356‑8661.
Recall number 20V433000 · Recall details
Technical service bulletins for the 2020 Tiffin Bus 2
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
What 2020 Tiffin Bus owners say
Most recent owner complaints, unedited.
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Questions about the 2020 Tiffin Bus
Is the 2020 Tiffin Bus reliable?
Owners have filed 1 complaint about the 2020 Tiffin Bus, close to a typical Bus model year.
What is the most common problem with the 2020 Tiffin Bus?
Engine and cooling, with 1 complaint.
How many recalls does the 2020 Tiffin Bus have?
3 recalls, covering fuel system, diesel, steering and visibility/wiper.
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