VEHICLE BUYER'S GUIDE
Cadillac STS2005–2011
Year-by-year buyer intelligence from NHTSA safety data — reliability, value, and which years to target or avoid.
Best Years to Buy a Cadillac STS
Buyer Score combines reliability (65%) and depreciation value (35%) — higher is better.
Cadillac STS Years to Avoid
3 recalls · 110 complaints
28 reported injuries
Top issue: AIR BAGS
2 recalls · 86 complaints
2 reported injuries
Top issue: ENGINE
2 recalls · 28 complaints
1 reported injury
Top issue: AIR BAGS
Federal Defect Investigations
NHTSA investigations are the stage that precedes a recall. 1 past investigation into the STS became recall.
Source: NHTSA Office of Defects Investigation. Data current as of October 25, 2026.
Cadillac STS — Year-by-Year Comparison
Every model year ranked by Buyer Score. Click any year for its detailed problem report.
| Year | Recalls | Complaints | Injuries | Deaths | Reliability | Value | Buyer Score | Verdict |
|---|---|---|---|---|---|---|---|---|
| 2011 | 0 | 5 | — | — | 57 | 39 | 51 | Excellent |
| 2010 | 0 | 6 | — | — | 57 | 39 | 51 | Excellent |
| 2009 | 0 | 11 | — | — | 57 | 39 | 51 | Excellent |
| 2008 | 0 | 28 | — | — | 57 | 39 | 51 | Good |
| 2007 | 2 | 28 | 1 | — | 57 | 39 | 51 | Good |
| 2006 | 3 | 110 | 28 | — | 57 | 39 | 51 | Avoid |
| 2005 | 2 | 86 | 2 | — | 57 | 39 | 51 | Caution |
Buyer Score = Reliability (65%) + Value window (35%). Deaths and injuries sourced from NHTSA complaint filings. Year links open full NHTSA problem reports.
Known Cadillac STS Problems
Most frequently reported components across all model years, from NHTSA owner complaints.
Complaint counts across all model years. Numbers indicate frequency, not severity.
Shopping by Era
How each generation of the STS compares — best year within each era shown.
Frequently Asked Questions
What is the best year STS to buy?+
The 2008 Cadillac STS scores highest on our Buyer Score (51/100) — combining a reliability score of 57/100 with a value score of 39/100. It has 0 recalls and 28 NHTSA complaints on record.
Which STS years have the most problems?+
The 2006, 2005, 2007 model years have the highest problem scores in our analysis. The 2006 STS leads with 3 recalls and 110 owner complaints.
What is the Buyer Score?+
The Buyer Score is a composite metric that combines reliability (65% weight) and depreciation value (35% weight). Reliability reflects recall and complaint severity. Value reflects how much of the vehicle's depreciation has already been absorbed by prior owners — a 4–6 year old vehicle typically sits in the sweet spot.
What are the most common STS problems?+
The most frequently reported Cadillac STS issues involve: AIR BAGS, ENGINE, ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM. These are aggregated across all model years from NHTSA owner complaint filings. Frequency of complaints does not necessarily indicate severity.
Deep-Dive Research
A buyer's guide shows model-level risk. A VIN report shows the individual vehicle — accidents, odometer history, open recalls, and auction records.