FaultScore

Monaco Coach Diplomat vs Mazda CX-50

Both cars' complete complaint records, side by side.

Read the totals carefully. NHTSA publishes no sales figures, so the car that sold more collects more complaints regardless of quality. The rows worth weighing are the proportions — the share of complaints that involved harm, and which part dominates.

Measure Monaco Coach Diplomat Mazda CX-50
Complaints on file 86 212
Model years covered 1998–2011 2023–2026
Worst model year 2000 2023
Best model year 2004 2026
Crashes reported 4 29
Fires reported 6 3
Injuries reported 1 16
Deaths reported 3 0
Most complained-about part Equipment & Accessories Driver Assist & Collision Avoidance
Share of complaints involving harm 16.3% 22.6%

Monaco Coach Diplomat by year

Complaints filed with NHTSA, by model year. Bar colour is the FaultScore grade: A B C D F ungraded

What breaks

Equipment & Accessories 16 18.6%
Body & Structure 15 17.4%
Electrical System 13 15.1%
Windows, Mirrors & Wipers 12 14.0%
Brakes 6 7.0%
Fuel & Propulsion 5 5.8%
Tires 5 5.8%
Other & Unspecified 4 4.7%

Mazda CX-50 by year

Complaints filed with NHTSA, by model year. Bar colour is the FaultScore grade: A B C D F ungraded

What breaks

Brakes 26 12.3%
Transmission & Drivetrain 20 9.4%
Electrical System 19 9.0%
Other & Unspecified 15 7.1%
Body & Structure 14 6.6%
Suspension 14 6.6%
Engine & Cooling 8 3.8%