Leaf spring broke in half while traveling down the highway. Completely destroyed left rear tire by locking it up and causing it to drag for 1 mile before I noticed and could stop.
The worst 2021 Grand Design Momentum problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Body42
- Suspension19
- Locks9
- Brakes2
- Electrical1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Body42
- Suspension19
- Locks9
- Brakes2
- Electrical1
- Lights1
- Transmission1
Recalls 4
Suspension: front: springs: leaf spring assembly: u-bolt, leaf spring to axle
- What is wrong
- Grand Design RV, LLC (Grand Design) is recalling certain 2021-2024 Momentum and 2022-2024 Solitude Fifth Wheel trailers. The U-bolt may become loose due to inadequate preload and preload losses, causing the axle to move out of position.
- Risk
- An axle that moves out of position can cause a loss of vehicle control and increase the risk of a crash.
- Remedy
- Dealers will replace the axle attachment components, free of charge. Owner notification letters were mailed May 15, 2026. Owners may contact Grand Design customer service at 1‑574‑825‑9679. Grand Design's number for this recall is 910054. This recall supersedes the federal safety agency Recalls 23V490 and 24V193.
Recall number 26V044000 · Recall details
Suspension: rear: springs: leaf spring assembly: u-bolt, leaf spring to axle
- What is wrong
- Grand Design RV, LLC. (Grand Design) is recalling certain 2021-2024 Momentum and Solitude fifth wheels, equipped with certain CURT 7000 and 8000 lb axles. The U-bolts may have been improperly tightened, which can cause the axle to move out of position.
- Risk
- An axle that moves out of position can cause a loss of vehicle control and increase the risk of a crash.
- Remedy
- Dealers will inspect and tighten the U-bolts, as necessary. Any damaged components will be replaced. Repairs will be performed free of charge. Owner notification letters were mailed August 16, 2023. Owners may contact Grand Design customer service at 1‑574‑825‑9679. Grand Design's number for this recall is 910039.
Recall number 23V490000 · Recall details
Equipment: appliance: refrigerator
- What is wrong
- Grand Design RV, LLC (Grand Design) is recalling certain 2013-2021 Momentum, Solitude, and Reflection recreational vehicles. A 110-volt wire in the refrigerator cabinet may be improperly secured, which could result in the wire contacting the refrigerator cooling unit, causing an electrical arc.
- Risk
- An electrical arc increases the risk of a fire.
- Remedy
- Dealers will inspect and replace any damaged wiring, and properly secure the wires, free of charge. Owner notification letters were mailed on February 21, 2022. Owners may contact Grand Design customer service at 1‑574‑825‑9679. Grand Design's number for this recall is 910026.
Recall number 22V038000 · Recall details
Equipment: recreational vehicle/trailer: lpg systems
- What is wrong
- Grand Design RV, LLC (Grand Design) is recalling certain 2016-2021 Imagine, Transcend, and Momentum travel trailers. The LP regulator that controls the LP gas pressure may fail, allowing excessive gas pressure that causes the appliance flame to increase.
- Risk
- Excessive gas pressure and a larger than intended appliance flame can increase the risk of a fire.
- Remedy
- Dealers will replace the LP regulator, free of charge. Owner notification letters were mailed June 24, 2021. Owners may contact Grand Design customer service at 1‑574‑825‑9679. Grand Design's number for this recall is 910023.
Recall number 21V393000 · Recall details
See all 4 recalls for the 2021 Grand Design Momentum
Defect investigations
Frame Flex on Grand Design Fifth Wheel Recreational Trailers
The Office of Defects Investigation (ODI) has received twenty-three complaints alleging excessive frame flex on model year 2017-2023 Grand Design fifth wheel recreational trailers, models Momentum and Solitude. Twenty-two of the complaints allege that excessive frame flex resulted in a cargo or entry door opening while in transit, some with objects lost on roadways, while six complaints also state that slideouts extended out partially. ODI has been in contact with both Grand Design and Lippert, the frame manufacturer. Grand Design believes that some frame flex, generally considered to be vertical movement in the upper deck area of the fifth wheel, is normal. However, Grand Design has developed a technical service bulletin (TSB), to evaluate concerns of excessive frame flex, defined as vertical movement greater than 3/8 inch. Per Grand Design, the frame flex is only occurring in the upper deck area of the fifth wheel and is resulting in cosmetic defects such as moving sidewalls, damage to cabinets, binding doors, etc. However, Lippert believes that the effects of frame flex may also extend back to the front axle of the trailer.While Lippert provides frames for multiple trailer manufacturers, the majority of complaints are for these Grand Design products. Cargo and entry doors that open and slideouts that extend while in transit increase the risk of injury or a crash. ODI is opening this Preliminary Evaluation (PE) to evaluate the severity of the potential problem and to determine whether an unreasonable risk to motor vehicle safety exists. To review the ODI reports cited in the Opening Resume ODI Report Identification Number document, go to
PE24029
Technical service bulletins for the 2021 Grand Design Momentum 2
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
What 2021 Grand Design Momentum owners say
Most recent owner complaints, unedited.
Upon returning from a recent trip I discovered that the passenger side rear leaf spring had snapped in to, near the rear leaf spring hanger. The equalizer also had cracked welds because of the incident. Thankfully the front of the leaf spring was still attached. This RV issue may be related to the widely documented frame flex issue. 1) The RV is at home in my storage shed. 2) Our safety and other motorists were put at risks because if the axle would have completely detached from the frame, it could have caused a catastrophic accident. 3) The broken leaf spring has been removed (picture of broken leaf spring, and equalizer attached). I plan to have a certified NRVIA inspector come inspect the unit. No other inspections have been completed as this just happened recently. 4) There were no warnings ahead of time about the leaf spring failure. I have reached out to Grand Design about coverage for the repair and they said they won't do anything because it is out of warranty. I further asked what their recomendations are and they have yet to respond. I believe this is a known engineering design flaw and these units should be recalled.
We own a 2021 Grand Design Momentum 393g toy hauler that has severe frame flex and bolts in slide have started backing out. We noticed this when driving and the extreme pushing/chucking when accelerating or braking and also the visible failure on the unit. We have contacted Gran Design, the manufacturer, for warranty repair and was able to go see the unit when they torn down to look at frame. The side walls were both broken and wall frame fell out when opened up. The unit is now at the manufacturer in Indiana for repair, my husband did not feel it was safe to tow so we requested manufacturer transport the unit. We were told by a Lippert Frame Tech the unit is not safe to use.
I am reporting a serious, progressive structural defect involving excessive frame flex and structural failure on a 2021 Grand Design Momentum 395MS fifth-wheel RV. This complaint directly aligns with the ongoing the federal safety agency investigation PE24-0209. The unit exhibits clear and worsening structural integrity failure, including: Slideouts and doors open during transport. Upper deck walls moving under load Lag bolts missing or backing out and pushing through flooring At least one critical structural bolt missing from factory installation Floor deformation and slope changes in the upper deck Slide-out malfunction due to frame distortion Loud popping and snapping noises while towing consistent with frame flex or structural separation These conditions reflect loss of structural integrity under normal use and represent a serious safety hazard, including risk of catastrophic failure while towing. On June 24, 2026, Lippert (frame/component supplier) assigned Case #6876203 and scheduled a mobile service inspection. This Grand Design Momentum 395ms is not safe to tow. It is a danger on the roads and they need to be recalled at the least for inspections of the frame for damage.
Frame cracked and suspension issues.
Regarding 2021 Grand Design Momentum 376THS: Compartment doors popping open during transport; Grand Design Customer Satisfaction Campaign TSB-24-001 dated 11/1/2025 regarding frame flex and wall securement. Returned to dealer on 12/1/2025 for inspection. Dealer found the following: All doors except p/s compartment door warped or bowed; P/S cracking in sidewall paneling on slides Front cap mollding broken screws Deformation or cracks at expansion joint located under upper deck slide out Gapping between exterior wall and floor Screw cover separation around front bulkhead Loose or shifted wall panel trim; trim pulled away from floor Crinkling wallpaper and cabinet paneling loos in upper cabinets
Scheduled appointment with dealer for the Grand Design Frame Flex recall today, 22 May 2026. Approximately 4 hours after dropping the trailer off the dealer called and said that the technician found significant frame flex and that the unit was unsafe to be towed. No other information was provided. I did ask for the measurements that the TSB 24-001 requires to be filled out ans submitted to Grand Design. The lady that called was completely unaware of what I was asking for.
The contact owns a 2021 Grand Design Recreational Momentum. The contact stated that while hauling the RV and driving at undisclosed speeds, the rear side door unexpectedly opened and the slide-out extended outward. No warning light was illuminated. The trailer was taken to a local dealer and remained with the dealer for additional inspections. The RV was not repaired. The manufacturer was made aware of the failure. The failure mileage was unavailable.
My Grand Design Momentum fifth wheel trailer is experiencing frame flex and structural integrity failure. The unit has developed spider cracking in the exterior fiberglass, interior wall separation, and plumbing issues believed to be caused by frame flex. The dealership has acknowledged structural concerns and installed lag bolts, but the underlying structural defect remains. Grand Design has denied that the frame flex caused the structural damage. This creates a serious safety risk while towing, including potential structural failure. I believe this is a manufacturing defect affecting the structural frame integrity.
The contact owns a 2021 Grand Design Momentum RV. The contact stated that while inspecting the RV, the contact became aware that the outrigger brackets were bent and fractured. The contact stated that the failure was visible over the axles. In addition, the welding on the cross-member beams was fractured, causing the floor to crack, and the exterior fiberglass was cracked by the bedroom slide-out. Additionally, there was a four-inch-long crack on the frame of the upper deck. Most recently, the contact found movement of the cabinets in the upper deck, and a portion of the fiberglass on the front cap had separated from the roof. The RV was taken to a welding shop to be diagnosed, and it was determined that the metal used to support the walls in the unit was not strong enough. The contact was informed that the weight on top caused it to bend and crack. The outrigger brackets were replaced, the cross members were replaced, and the other cracks were repaired. The manufacturer was notified of the failure and denied the warranty claim. However, the manufacturer failed to acknowledge the failure and advised the contact to call the insurance company since the manufacturer believed that the RV had been involved in an accident. The contact denied that the RV had been in an accident. The contact noticed the issues since the RV was purchased. The failure mileage was unknown.
Compare the 2021 Grand Design Momentum
Other model years
Questions about the 2021 Grand Design Momentum
Is the 2021 Grand Design Momentum reliable?
Owners have filed 58 complaints about the 2021 Grand Design Momentum, 3.9 times a typical Momentum model year. It is one of the years we flag to avoid.
What is the 2021 Grand Design Momentum year score?
The 2021 Grand Design Momentum scores 22 out of 100 (poor). The score compares it with the other model years of the Grand Design Momentum: 75 is a typical year, 50 means twice the usual complaints, and serious complaints and recalls lower it.
What is the most common problem with the 2021 Grand Design Momentum?
Body and structure, with 42 complaints. Next is suspension (19).
How many recalls does the 2021 Grand Design Momentum have?
4 recalls, covering suspension and equipment.
What year does the Grand Design Momentum have the most body problems?
The Grand Design Momentum model years with the most body complaints are 2021 (42 complaints), 2022 (28 complaints) and 2023 (20 complaints).
VIN decoder
See the problems and recalls for an exact car
Buying a used 2021 Grand Design Momentum?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history