2006 Cadillac STS Engine Problems

NHTSA component category: ENGINE · data through 07/12/2026

20Engine complaints

14.4%Of all 139 complaints

#3Most-reported category

Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.

How engine ranks on this vehicle

AIR BAGS50 · 36%

ELECTRICAL SYSTEM20 · 14.4%

ENGINE20 · 14.4%

FUEL/PROPULSION SYSTEM18 · 12.9%

ELECTRONIC STABILITY CONTROL (ESC)8 · 5.8%

Share of the 139 complaints citing each category; one complaint can cite several. Full breakdown on the 2006 Cadillac STS overview page.

What owners report

“THE CONTACT OWNS A 2006 CADILLAC STS. THE CONTACT STATED THAT THE VEHICLE EXPERIENCED AN ABNORMAL NOISE FROM THE ENGINE COMPARTMENT. THE VEHICLE WAS TAKEN…”NHTSA complaint 10865431 — filed 05/17/2016

“HELLO, I PURCHASED A 2006 STS V8 LAST JANUARY. SINCE THEN I HAVE HAD TO REPLACE ALL FOUR TIRES IMMEDIATELY, A STARTER, AND THE BRAKES…”NHTSA complaint 10823375 — filed 02/01/2016

“THE CAR SPARK PLUGS KEEP GOING OUT AND THE CAR IS MAKE A CLICKING NOISE IT IS SILENDER 1 AND 3.”NHTSA complaint 10789428 — filed 11/09/2015

Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.

Engine complaints by year filed

Frequently asked questions

Does the 2006 Cadillac STS have engine problems?

Engine is the #3 most-reported problem area on the 2006 Cadillac STS: 20 of 139 complaints on file (14.4%). Complaints are unverified owner reports, not confirmed defects.

How many complaints does the 2006 Cadillac STS have in total?

139 complaints were on file with NHTSA as of 07/12/2026. Across all categories, 16 involved a crash, 6 involved a fire, 20 reported injuries, and none reported deaths.

What does NHTSA's engine category include?

NHTSA assigns each complaint to standard component categories; this page reports the ENGINE category exactly as NHTSA defines and records it.

About this data — Complaint figures on this page are consumer reports submitted to the National Highway Traffic Safety Administration (NHTSA), a U.S. government agency. NHTSA does not verify individual complaints; a complaint is not proof that a defect exists, and counts reflect what owners chose to report, not confirmed failure rates. Recall information comes from official NHTSA safety recall campaigns; recall repairs are free at authorized dealers. Always check your specific vehicle by VIN at nhtsa.gov/recalls. CarModelProblems.com is an independent site and is not affiliated with NHTSA or any vehicle manufacturer. Data through 07/12/2026.