Equal-exposure complaint evidence and changes in the reported problem mix

2003 vs 2004 CHEVROLET TRAILBLAZER

NHTSA Consumer Complaints complaints · snapshot 2026-08-21

Share shifts show how a vehicle's problem mix changed. They do not measure reliability, and complaint counts are not normalized for sales volume.

First 275 months on market for each model year

Exposure window calculated through Aug 22, 2026

Age-matched reports

▲ 20.0% more reports in the equal exposure window

NHTSA Consumer Complaints complaints · snapshot 2026-08-21

Bars start at the neutral midpoint. Left means a smaller share; right means a larger share.

View component share data as a table

Component	2003 share	2004 share	Share change
ELECTRICAL SYSTEM	27.2%	51.7%	▲ 24.5 pts larger share
POWER TRAIN	9.0%	4.4%	▼ 4.6 pts smaller share
FUEL SYSTEM	17.7%	13.2%	▼ 4.6 pts smaller share
VISIBILITY	6.4%	2.3%	▼ 4.2 pts smaller share
ENGINE	6.3%	4.0%	▼ 2.4 pts smaller share
STRUCTURE	3.7%	1.4%	▼ 2.3 pts smaller share
AIR BAGS	5.5%	3.5%	▼ 2.1 pts smaller share
SUSPENSION	2.9%	0.9%	▼ 2.0 pts smaller share
WHEELS	2.0%	0.2%	▼ 1.8 pts smaller share
STEERING	1.9%	0.7%	▼ 1.3 pts smaller share
SEAT BELTS	1.8%	0.6%	▼ 1.3 pts smaller share
EXTERIOR LIGHTING	7.1%	8.2%	▲ 1.1 pts larger share
VEHICLE SPEED CONTROL	2.1%	2.8%	▲ 0.7 pts larger share
SERVICE BRAKES	2.3%	1.9%	▼ 0.4 pts smaller share
FORWARD COLLISION AVOIDANCE	not reported	0.1%	▲ 0.1 pts larger share
TIRES	0.6%	0.5%	▼ 0.1 pts smaller share
UNKNOWN OR OTHER	53.3%	48.0%	▼ 5.3 pts smaller share

NHTSA Safety Recalls recalls · snapshot 2026-08-22

2003 8

Campaign components: AIR BAGS, EQUIPMENT, EXTERIOR LIGHTING, POWER TRAIN, SERVICE BRAKES, HYDRAULIC, and VISIBILITY

2004 2

Campaign components: EXTERIOR LIGHTING

NHTSA Consumer Complaints complaints · snapshot 2026-08-21