Cadillac STS Reliability — Best and Worst Years by the Data

Quick answer

The 2006 draws 4.34 complaints per run and the 2009 1.36, a 3.2-fold gap within the same model. Half of all complaints arrive by 7 years of age, so 71.5% land after the 4-year basic warranty ends. The system owners report most is Air Bags, with 91 complaints, typically at 7.5 years.

Cadillac STS years to avoid — and the best ones

FIG.01·Cadillac STS — complaint rate by model year
Model year	Per run	Complaints	Runs	Enough history?
2011	1.75	7	4	yes
2009	1.36	15	11	yes
2008	1.68	42	25	yes
2007	2.35	47	20	yes
2006	4.34	126	29	yes
2005	3.4	85	25	yes
2004	1.25	5	4	yes
2003	1.14	8	7	yes
2002	1.2	6	5	yes

ROWS 9·SOURCE NHTSA complaints, grouped by VIN production run

Does the market discount it? In our listings a 2006 STS asks a median $2,950, against $2,999 for a 2007, the next model year: about the same, so the price shows no discount for its complaint record.

Among the 5 Cadillac STS years with enough history, the three to walk away from are 2006, 2005, 2007; the three worth hunting are 2009, 2008, 2007.

When it starts to break

FIG.02·Cadillac STS — age at failure
Age at failure	Complaints	Running total	Warranty
0 years	26	7.9%	covered
1 year	31	17.3%	covered
2 years	16	22.1%	covered
3 years	21	28.5%	covered
4 years	21	34.8%	you pay
5 years	11	38.2%	you pay
6 years	27	46.4%	you pay
7 years	23	53.3%	you pay
8 years	39	65.2%	you pay
9 years	51	80.6%	you pay
10 years	18	86.1%	you pay
11 years	16	90.9%	you pay
12 years	10	93.9%	you pay
13 years	8	96.4%	you pay
14 years	10	99.4%	you pay
15 years	2	100%	you pay

ROWS 16·SOURCE NHTSA complaints with incident dates

Basic warranty on this car is 4 years / 50,000 miles. Only 28.5% of reported failures happen inside it — the remaining 71.5% come out of the owner's pocket. Powertrain cover (4 years / 50,000 miles) reaches further, but it only covers the engine and transmission, which account for about 28% of the complaints here.

What actually fails — and at what age

On the Cadillac STS, the early trouble is Engine And Engine Cooling — reported at around 4 years, so a car still under warranty is the one to check for it. What waits further out is Air Bags at 7.5 years — past every basic warranty, and the bill lands on whoever owns the car then.

FIG.03·Cadillac STS — what fails and when
System	Complaints	Typical age	Crash	Fire
Air Bags	91	7.5 yrs	16	1
Electrical System	66	5.6 yrs	4	6
Engine	40	9.1 yrs	2	1
Power Train	36	6.4 yrs	3	1
Fuel/propulsion System	29	9.2 yrs	—	3
Service Brakes	27	6 yrs	6	2
Engine And Engine Cooling	20	4 yrs	2	1
Steering	20	6.6 yrs	3	—

ROWS 8·SOURCE NHTSA complaints

What else in this class

6 models share the STS's vehicle class. Per production run, the Toyota Camry draws 5.65, the Honda Accord 4.02 and the Dodge Challenger 3.27, against 2.65 for the STS. That is the fewest complaints of the group.

FIG.05·Cadillac STS — rivals in the same class
Same class as the STS	Complaints on record	Recall campaigns	Years built
Toyota Camry	20,039	161	1983–2026
Honda Accord	24,369	415	1981–2026
Dodge Challenger	1,696	77	1981–2026
Toyota Prius	12,873	109	2001–2026
Hyundai Elantra	9,090	117	1992–2026
Nissan Altima	15,657	148	1993–2026

ROWS 6·SOURCE NHTSA complaints and recall campaigns

The table shows totals on record; the rates per production run are in the sentence above.

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Everything on the Cadillac STS

Recalls14 campaigns Fuel economy21 mpg best Common problems371 complaints Check a VINAgainst this exact build DimensionsSize, weight, generations Cargo space14 cu ft Used prices137 listings What yours is worthValue by year & mileage Insurance costEstimated per year Window stickerOriginal Monroney label Decode a VINWhat each character means About this car2005–2011

Frequently asked questions

Is the Cadillac STS reliable?

By complaints per production run it is better than typical: 2.65 against 3.73 for the average car, and fewer than each of the 3 class rivals we compared.

Which STS years should you avoid?

By complaints per production run, 2006, 2005, 2007. The cleanest years old enough to judge are 2009, 2008, 2007. Years newer than 6 are left out: complaints keep arriving for years after a car is sold.

When do STS problems usually start?

Half of all complaints arrive by 7 years of age. The most reported system is Air Bags, typically at 7.5 years, followed by Electrical System.

Will the warranty cover STS problems?

Mostly not: basic cover is 4 years / 50,000 miles, and only 28.5% of reported failures fall inside it. Powertrain cover lasts longer, but engine and transmission make up about 28% of the complaints here.

Is the STS more reliable than the Toyota Camry?

Yes: 2.65 complaints per production run for the STS against 5.65 for the Toyota Camry.

Complaint records from NHTSA, grouped by VIN production run (characters 1–11). Rates, age-at-failure and warranty coverage computed by ForCar. Model years newer than 6 years are excluded from rankings — complaints accumulate for a decade (how we measure). Last updated Nov 2026. — ForCar Reviewed by Denis Kataev, founder of ForCar.

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