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

2004 vs 2005 CHEVROLET IMPALA

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 263 months on market for each model year

Exposure window calculated through Aug 22, 2026

Age-matched reports

▼ 43.0% fewer 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	2004 share	2005 share	Share change
ELECTRICAL SYSTEM	55.1%	46.4%	▼ 8.7 pts smaller share
FUEL SYSTEM	1.7%	6.0%	▲ 4.3 pts larger share
STEERING	3.6%	7.0%	▲ 3.4 pts larger share
POWER TRAIN	2.9%	5.6%	▲ 2.7 pts larger share
VISIBILITY	1.1%	2.8%	▲ 1.7 pts larger share
EXTERIOR LIGHTING	8.6%	7.3%	▼ 1.3 pts smaller share
AIR BAGS	2.0%	3.0%	▲ 1.0 pts larger share
ENGINE	8.1%	7.1%	▼ 1.0 pts smaller share
SERVICE BRAKES	4.8%	4.1%	▼ 0.7 pts smaller share
SEAT BELTS	0.4%	1.0%	▲ 0.6 pts larger share
VEHICLE SPEED CONTROL	3.2%	2.8%	▼ 0.4 pts smaller share
TIRES	0.3%	0.7%	▲ 0.4 pts larger share
WHEELS	0.7%	0.5%	▼ 0.2 pts smaller share
SUSPENSION	0.8%	0.7%	▼ 0.1 pts smaller share
FORWARD COLLISION AVOIDANCE	0.1%	not reported	▼ 0.1 pts smaller share
PARKING BRAKE	0.1%	0.2%	▲ 0.1 pts larger share
STRUCTURE	0.9%	1.0%	▲ 0.1 pts larger share
UNKNOWN OR OTHER	43.6%	37.8%	▼ 5.9 pts smaller share

NHTSA Safety Recalls recalls · snapshot 2026-08-22

2004 7

Campaign components: ELECTRICAL SYSTEM, ENGINE AND ENGINE COOLING, and FUEL SYSTEM, OTHER

2005 4

Campaign components: ELECTRICAL SYSTEM and FUEL SYSTEM, OTHER

NHTSA Consumer Complaints complaints · snapshot 2026-08-21