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2018 Thor Motor Coach Miramar problems

The most common problem on the 2018 Thor Motor Coach Miramar is transmission and drivetrain. Its complaint count is close to a typical Miramar model year.

Typical yearClose to a typical year
Owner complaints
2
Recalls
3
Service bulletins
2
Worst area
Transmission

The worst 2018 Thor Motor Coach Miramar problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

  • Transmission
    1
  • Visibility
    1

Problems by type

Tap a problem to see which part fails, at what mileage and in which other years.

  • Transmission
    1
  • Visibility
    1

Recalls 3

VisibilityReported November 16, 2018 · 1,485 vehicles affected
What is wrong
Thor Motor Coach (TMC) is recalling certain 2017-2019 Thor Challenger, Miramar, and Outlaw motorhomes. The motorized windshield roller shade at the driver's seating position may unroll without warning while driving.
Risk
If the windshield roller shade unrolls while driving, it could block the driver's visibility, increasing the risk of a crash.
Remedy
TMC will notify owners, and dealers will install a fastener to ensure the motor will not allow the shade to roll down during while driving. The recall began January 10, 2019. Owners may contact TMC customer service at 1‑877‑855‑2867. TMC's number for this recall is RC000165.

Recall number 18V812000 · Recall details

EquipmentReported November 22, 2017 · 110,400 vehicles affected
What is wrong
Thor Motor Coach (Thor) is recalling various 2003-2018 recreational vehicles, equipped with Kidde Plastic-Handle or Push Button 'Pindicator' Fire Extinguishers. See a list of the affected trailer models at: These extinguishers may become clogged, preventing the extinguisher from discharging as expected or excessive force may be needed to activate the extinguisher. Additionally, in certain models, the nozzle may detach from the valve assembly with enough force that it could cause injury and also render the product inoperable. For a full list of the affected fire extinguisher models visit:
Risk
In the event of a fire, if the fire extinguisher does not function properly, it can increase the risk of injury.
Remedy
Thor will notify owners, instructing them to contact Kidde for a replacement fire extinguisher, free of charge. The recall began on January 15, 2018. Owners may contact Thor customer service at 1‑877‑500‑1020, or Kidde customer service toll-free at 1‑855‑262‑3540, or online at www.kidde.com and click on "Product Safety Recall" for more information.

Recall number 17V758000 · Recall details

Equipment: other: labelsReported October 9, 2017 · 507 vehicles affected
What is wrong
Thor Motor Coach (TMC) is recalling certain 2017-2018 Challenger, Axis, Chateau, Four Winds, Hurricane, Miramar, Palazzo, Tuscany, Vegas, Venetian, and Windsport motorhomes. The cargo carrying capacity (CCC) label on these vehicles may indicate an incorrect water capacity for the water heater/fresh water tank. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 120, "Tires and Rims for Motor vehicles over 10,000lbs."
Risk
If the water capacity information is incorrect and it causes the vehicle to be over loaded, there would be an increased risk of a crash.
Remedy
TMC will notify owners and send them corrected labels, free of charge. The recall began on November 15, 2017. Owners may contact TMC customer service at 1‑877‑500‑1020. TMC's number for this recall is RC000147.

Recall number 17V634000 · Recall details

See all 3 recalls for the 2018 Thor Motor Coach Miramar

Defect investigations

Trailer Hitch Receiver Structure May Crack and SeparateOpened August 14, 2024, closed January 16, 2026

The Office of Defects Investigation (ODI) opened this Preliminary Evaluation, PE24023, on August 14, 2024, to investigate allegations of Thor Motor Coach motorhome frame or trailer hitch structure cracking and separating. The hitch was manufactured by Lippert and installed by Thor as standard original equipment. ODI received eight Vehicle Owner Questionnaires (VOQs) describing the hitch structure cracking. If not caught in time, a cracked hitch can fully fracture and separate from the vehicle. ODI sent information requests to Thor and Lippert on September 6, 2024 and September 27, 2024, respectively. Thor's full response was received October 31, 2024, and Lippert's full response was received December 6, 2024. ODI reviewed the responses and learned of improvements introduced to increase the overall strength of the system. The manufacturers reported 32 total incidents, and ODI is aware of 37 non-duplicative subject vehicle incidents in total, including four crash incidents where the towed vehicle separated and struck a roadside feature. The overall failure rate for all subject vehicles is low, and ODI isnot aware of any failures on vehicles produced in the last 30 months. Although a defect has not been identified, the manufacturers understand the seriousness of a potential hitch receiver structure failure. As a result, Thor, supported by Lippert, is conducting a customer satisfaction campaign that instructs consumers to inspect their hitch structure and informs what to look for and what to do if issues are found. If consumers areuncomfortable performing this inspection, Thor dealers can inspect the trailer hitch for them. The inspection and repair will be done at no expense to the consumer. ODI is closing this Preliminary Evaluation (PE) with this manufacturer action. The closing of this investigation does not constitute a finding by the federal safety agency that a safety-related defect does not exist. The Agency reserves the right to take additional action if warranted by future circumstances. To review the ODI reports cited in the Closing Resume ODI Report Identification Number document, go to

PE24023

Technical service bulletins for the 2018 Thor Motor Coach Miramar 2

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

What 2018 Thor Motor Coach Miramar owners say

Most recent owner complaints, unedited.

Filed Feb 12, 2025 · Transmission · IN

See attached document for complaint.

Filed Apr 16, 2020 · Visibility · 500 miles · MI

Every time I drive the rv and a change in temperature and humidity occurs the windshield and both side windows fog very bad, they will not defrost and you cannot see while driving down the road, you cannot see through the mirrors on either side because of this, it does not matter what road you are on. Not enough airflow from the defroster and not enough vents on the front windshield, it has no side vents at all. I have reported to the manufacture before and they say it meets the industry standards.

Compare the 2018 Thor Motor Coach Miramar

Other model years

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Questions about the 2018 Thor Motor Coach Miramar

Is the 2018 Thor Motor Coach Miramar reliable?

Owners have filed 2 complaints about the 2018 Thor Motor Coach Miramar, close to a typical Miramar model year.

What is the most common problem with the 2018 Thor Motor Coach Miramar?

Transmission and drivetrain, with 1 complaint. Next is visibility (1).

How many recalls does the 2018 Thor Motor Coach Miramar have?

3 recalls, covering visibility and equipment.

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