Chevrolet Trailblazer EXT vs Pontiac Bonneville

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	Chevrolet Trailblazer EXT	Pontiac Bonneville
Complaints on file	1,070	2,580
Model years covered	2002–2006	1977–2005
Worst model year	2003	1998
Best model year	2002	2004
Crashes reported	23	135
Fires reported	20	180
Injuries reported	21	117
Deaths reported	0	0
Most complained-about part	Fuel & Propulsion	Engine & Cooling
Share of complaints involving harm	6%	16.7%

Chevrolet Trailblazer EXT by year

120 406 306 238

02 03 04 06

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

What breaks

Fuel & Propulsion 297 27.8%

Electrical System 281 26.3%

Transmission & Drivetrain 97 9.1%

Lights 60 5.6%

Engine & Cooling 59 5.5%

Windows, Mirrors & Wipers 56 5.2%

Body & Structure 47 4.4%

Doors, Latches & Locks 24 2.2%

Pontiac Bonneville by year

1 4 2 2 1 1 2 3 24 20 35 45 26 139 183 123 330 181 188 359 176 301 179 113 67 38 37

77 78 79 81 82 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 01 02 03 04 05

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

What breaks

Engine & Cooling 615 23.8%

Electrical System 324 12.6%

Brakes 256 9.9%

Steering 218 8.4%

Transmission & Drivetrain 171 6.6%

Fuel & Propulsion 169 6.6%

Airbags 150 5.8%

Windows, Mirrors & Wipers 133 5.2%