AI Damage2020 Grand Design Momentum: common problems
Owners of the 2020 Grand Design Momentum filed 29 complaints with NHTSA, most often about structure and suspension. The maker issued 2 service bulletins for this year. Details by component below, with sources.
Key figures
- Owner complaints
- 29
- Technical service bulletins (TSB)
- 2
What fails most often
- 1 Structure 66% of all complaints
- 2 Suspension 28% of all complaints
- 3 Latches, locks, linkages 10% of all complaints
- 4 Equipment 7% of all complaints
- 5 Electrical system 3% of all complaints
- 6 Service brakes 3% of all complaints
- Structure: 19 complaints (66% of all); manufacturer bulletins for this component: 1.
- Suspension: 8 complaints (28% of all).
- Latches, locks, linkages: 3 complaints (10% of all).
- Equipment: 2 complaints (7% of all); manufacturer bulletins for this component: 1.
- Electrical system: 1 complaints (3% of all).
Symptoms owners describe
How many of the 29 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Structure | 19 | 0 | 1 |
| Suspension | 8 | 0 | 0 |
| Latches, locks, linkages | 3 | 0 | 0 |
| Equipment | 2 | 0 | 1 |
| Electrical system | 1 | 0 | 0 |
| Service brakes | 1 | 0 | 0 |
| Other | 16 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
I'm submitting this report on our RV because we are discovering we very likely have an issue with the frame which is causing over flexing when it is being towed. This has caused damage inside the RV where the trim and cabinetry are damaging the walls due to more movement than should be occurring.
The contact noticed smoke coming from underneath the RV, and the refrigerator circuit braker then tripped. No warning lights were illuminated. The RV was taken to the dealer, where it was diagnosed with a failed electrical wiring system and junction box.
The mobile technician performed a temporary repair at the residence. The RV was then towed to the dealer, where it was diagnosed. The dealer determined that the spring brackets needed to be straightened and reinforced and needed to be welded inside the brackets.
Issues with: - original drum breaks failed due to incorrect wiring, requiring 100% assembly replacement. - front wall separation - trim and cabinets moving and separating from walls - missing and broken lag bolts - front weather stripping separated from front cap - excessive sawdust under cabinets after any travel -…
Roof Membrane separating from nose cap, nose cap separating from roof membrane. 5th wheel pin box sinking up into rv upper deck when lowering onto the truck. Cargo and main doors open during transport. Sawdust on dresser in nose of the RV. Lag Screws unscrewing and/or loose in the upper deck.
back garage man door would open by itself while traveling if deadbolt not used , front man door sticks and screen door has to be opened separately with considerable force. Will be opening a claim for flex frame with Grand Design
We had 2 that were rusted and half way out, one that was sheared off and one that was hanging loosely. We took it into a dealership in LA where they did the frame flex evaluation for Grand Design and it was determined to change out the lag bolts for 1/2 inch ones on both sides of the superstructure.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 6,958 of 36,656 model years in the NHTSA data (top 19% most complained about).
On average one model year of the Momentum has 18 complaints (12 years in the data). This year has 29, above average.
What to check before buying
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Suspension. Wheel alignment, control arms, subframe, even tire wear.
- Latches, locks, linkages. Door, hood and tailgate latches, especially near the impact.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Grand Design is addressing concerns of excessive frame flex or wall securement in the front upper deck…
Grand Design is addressing concerns of excessive frame flex or wall securement in the front upper deck area of a limited number of fifth-wheel units. This condition could potentially occur over time due to a…
- Customer Satisfaction Program released to have a protective heat shield installed behind convection…
Customer Satisfaction Program released to have a protective heat shield installed behind convection microwave on units identified below to address concerns with excessive heat buildup.
Other years of this model
Questions and answers
What are the most common problems with the 2020 Grand Design Momentum?
Owner complaints to NHTSA most often mention: structure, suspension, latches, locks, linkages. Total complaints: 29. The most frequent symptoms in complaint texts: smoke, burning smell, fire (7%), A/C or heater (3%), rust, corrosion (3%).
How many service bulletins (TSB) were issued for the 2020 Grand Design Momentum?
NHTSA lists 2 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2020 Grand Design Momentum from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2020 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.