Big Dog Mastiff Problems by Model Year
NHTSA recorded 6 consumer complaints across the 1 model years of the Big Dog Mastiff (2004–2004) that have at least 5 complaints. 2004 has the most, with 6. Across all years, the part named most often is electrical system (5 mentions). Pick a model year below to see its parts, mileage, recalls and service bulletins.
All Mastiff model years
Years with fewer than 5 complaints are not listed. The score compares years of the same model, allowing for the era and for how long each year has collected complaints: 50 is a typical year, lower means fewer complaints. It is not adjusted for sales volume.
| Year | Complaints | Median mi | Recalls | TSBs | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|
| 2004 | 6 | 5,000 | 5 | 6 | — | Not enough data |
Parts named most often, all years
Counts add up complaint mentions across the listed years. A complaint can name several parts.
- Electrical system5 63%
- Exterior lighting2 25%
- Transmission and drivetrain1 13%
Example complaints
One per model year, chosen for length and detail. Personal details are removed. They are consumer reports, not findings.
2004: “Squealing noise coming from primary gets louder as it reaches normal operating temperature. Dealer says they don't know what is wrong. After manufacturer had the bike for 3 weeks, they said we gave it our best shot with our best tech, have your attorney call us . One of numerous problems not fixed.”
NHTSA complaint #10165706, filed 2006-08, 4,600 milesOther Big Dog models
26 complaintsBig Dog Pitbull
12 complaintsBig Dog Ridgeback
12 complaintsBig Dog K-9
5 complaints
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Methodology