AI Damage2004 Holiday Rambler Neptune: common problems
Owners of the 2004 Holiday Rambler Neptune filed 5 complaints with NHTSA, most often about suspension and engine and cooling. Details by component below, with sources.
Key figures
- Owner complaints
- 5
What fails most often
- 1 Suspension 80% of all complaints
- 2 Engine and cooling 20% of all complaints
- 3 Powertrain 20% of all complaints
- Suspension: 4 complaints (80% of all).
- Engine and cooling: 1 complaints (20% of all).
- Powertrain: 1 complaints (20% of all).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Suspension | 4 | 0 | 0 |
| Engine and cooling | 1 | 0 | 0 |
| Powertrain | 1 | 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.
The contact stated no warning light was illuminated. The contact stopped the RV and observed that the rear bumper was almost touching the road surface and the rear passenger side tire was almost touching the wheel well.
Embarked on a road trip at approximately 9:30 am after traveling about 4 miles the entire motorhome went into a violent and severe swaying motion. I slowed the veh and pulled to shoulder of the road, inspected all tires, nothing apparent or obvious.
Found both rear trailing arms to be cracked upon inspection. Replaced both arms to correct problem. Old arms were cracked to a point where total failure was eminent.
With only 14,000 miles on vehicle the aluminum radiator began leaking where the core is attached to the tank. Manufacture has since replaced aluminum with steel radiators but would not agree to pay for any of the replacement since the warranty time has expired.
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 14,282 of 36,656 model years in the NHTSA data (top 39% most complained about).
On average one model year of the Neptune has 4 complaints (7 years in the data). This year has 5, above average.
What to check before buying
- Suspension. Wheel alignment, control arms, subframe, even tire wear.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Powertrain. Shift quality under load, harsh shifts, transmission codes, CV joints.
Other years of this model
Questions and answers
What are the most common problems with the 2004 Holiday Rambler Neptune?
Owner complaints to NHTSA most often mention: suspension, engine and cooling, powertrain. Total complaints: 5. The most frequent symptoms in complaint texts: warning lights, check engine (20%).
How many service bulletins (TSB) were issued for the 2004 Holiday Rambler Neptune?
NHTSA lists 0 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 2004 Holiday Rambler Neptune 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 2004 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.