The 2018 Thor Motor Coach Ace has 3 NHTSA recall campaigns affecting an estimated 110,603 vehicles. Recall repairs are always free at any authorized dealer. Owners have filed 6 complaints with NHTSA, most often about the electrical system. Last updated July 5, 2026.
Recall campaigns
EQUIPMENT18V4980002018-07-30167 affected
Defect
Thor Motor Coach (TMC) is recalling certain 2018 Thor Ace 27.2 recreational vehicles. The rubber liquid propane (LP) hose may sag and contact the tire in the wheel well.
Consequence
Contact with the tire may cause the LP hose to leak, increasing the risk of a fire.
Remedy
TMC will notify owners, and dealers will inspect the rubber LP hose and replace it as necessary. Dealers will install additional p-clamps or relocate the existing p-clamps to properly secure the hose, free of charge. The recall began on August 22, 2018. Owners may contact TMC customer service at 1-877-855-2867. …
EQUIPMENT17V7580002017-11-22110,400 affected
Defect
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: https://static.nhtsa.gov/odi/rcl/2017/RMISC-17V758-5764.pdf. These extinguishers may become clogged,…
Consequence
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…
EXTERIOR LIGHTING17V6920002017-11-0236 affected
Defect
Thor Motor Coach (TMC) is recalling certain 2018 Ace, Axis, Hurricane, Windsport, and Vegas motorhomes. The wiring for the trailer lights may have been inserted into the wrong locations of the trailer lighting socket causing the trailer lights to not function properly. As such, these vehicles fail to comply with…
Consequence
If the trailer lights do not function as intended, it can increase the risk of a crash.
Remedy
Thor has notified owners and dealers will re-wire a new connector, free of charge. The recall began on November 21, 2017. Owners may contact TMC customer service at 1-877-500-1020. TMC's number for this recall is RC000148.
Complaints by component
ELECTRICAL SYSTEM
1
ENGINE
1
POWER TRAIN:AUTOMATIC TRANSMISSION
1
STEERING
1
SUSPENSION:FRONT:WHEEL BEARING
1
VISIBILITY/WIPER
1
Total complaints6
What owners report
Verbatim reports filed with NHTSA, lightly edited for readability and with personal
information removed.
“The contact owns a 2018 thor ace rv. The contact stated that while driving 70 mph, the vehicle suddenly veered to the right and the driver was no longer able to properly steer the vehicle. A mobile mechanic was called to the location and diagnosed that the front passenger’s side wheel bearing…”
“Transmission down shifts excessively on downhill grades”
“Tl* the contact owns a 2018 thor ace motor home. The contact stated that the windshield fluid sprayer did not spray the fluid high enough to clean the entire windshield. The failure caused a build-up of debris on the windshield. The vehicle was taken to camping world of bakersfield [REDACTED],…”
“Underrated circuit breaker, 15 amp vice 20 amp, rating for rear air conditioner. Forward air conditioner, same model and size, has correct 20 amp circuit breaker. Overrated fuse d8, 20 amp vice 15 amp, on ceiling lights. This was found while stationary troubleshooting a water leak. I decided to…”
“Tl* the contact owns a 2018 thor ace. While driving various speeds, the steering wheel was extremely loose, the auxiliary battery overheated, and the vehicle decelerated. In addition, the check engine warning indicator illuminated. Upon opening the hood, the contact noticed acid emerging from the…”
“Tl* the contact owns a 2018 thor ace. While driving various speeds, the steering wheel was extremely loose, the auxiliary battery overheated, and the vehicle decelerated. In addition, the check engine warning indicator illuminated. Upon opening the hood, the contact noticed acid emerging from the…”
Recall, complaint, and investigation records from official NHTSA datasets (FLAT_RCL,
FLAT_CMPL, FLAT_INV), synced weekly. Counts reflect NHTSA records for the 2018 Thor Motor Coach Ace as of
July 5, 2026. Complaint narratives are consumer-submitted and unverified. This page
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