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Cadillac STSModel year report

1999 Cadillac STS Problems

Complaints
13filed with NHTSA
Median mileage
98,587miles, 9 complaints with mileage
Recalls
0campaigns on record
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

Sources: NHTSA records for the 1999 Cadillac STS (complaints, recalls, investigations). Report an error

NHTSA recorded 13 consumer complaints for the 1999 Cadillac STS. The part named most often is electrical system, with 6 complaints (46% of the total), followed by engine cooling (6) and engine (2). 9 of the complaints include a mileage, and 11% of those were filed for vehicles with under 50,000 miles; the median is 98,587 miles. Of all complaints, 1 a fire, according to the filers. NHTSA lists 0 recall campaigns and 11 technical service bulletins for this model year. Electrical system complaints overlap with 1 technical service bulletin filed under the same part. Engine cooling complaints overlap with 1 technical service bulletin filed under the same part.

This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Example complaints

Electrical system: “On 11/27/00 car leased from chevy dealer and onstar put on by Cadillac dealer. On 01/08/01 car dead in drive,Cadillac dealer installed new battery. On 10/01/01 car quit while driving, Cadillac dealer installed new generator. On 7/18/02 car dead in drive,chevy dealer replaced generator. On 9/13/04 car dead in drive ,chevy dealer found nothing. On 11/18/04 car dead in doctor's lot,chevy dealer found nothing and sent it to Cadillac dealer who also found nothing. Two days later car dead in store lot. Sent back to Cadillac dealer who installed generator and battery. …”

NHTSA complaint #10139330, filed 2005-10, 35,124 miles

Engine cooling: “Our STS stalled several times, but the scariest was on the highway going 65 MPH. The car totally shut off, leaving the car without any power. We were able to guide the car to the side of the highway and thank goodness it started again. On several other occasions, the car would shut off and sometimes wouldn't even start up right away. This was very frustrating and the unknowing, made driving this car very unpredictable. Every time we brought the car to be checked they could not find anything . Finally, an independent mechanic suggested putting in a new starter and this solved the problem. …”

NHTSA complaint #10632731, filed 2014-09, 98,587 miles

Engine: “The contact owns a 1999 Cadillac STS. The contact stated that the head bolts were not the correct size for the engine and as a result, they stripped, causing the engine head to detach from the vehicle. The vehicle was taken to the dealer who diagnosed that the engine needed to be remanufactured. The vehicle was repaired however, the failure recurred. The manufacturer was not made aware of the failure. The vehicle was not further repaired. The VIN was not available. The failure mileage was 128,000 and the current mileage was unknown.”

NHTSA complaint #10470401, filed 2012-08, 128,000 miles

Mileage when problems were reported

11% of the 9 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 80,000 and 106,244 miles.

0%0–100%10–2511%25–5011%50–7533%75–10033%100–15011%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (9 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 98,587 miles.

Complaints by year filed

Fewer than 15 complaints, too few for a reliable trend.

2005200642009201020122014
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Recalls and investigations

NHTSA lists no recall campaigns for the 1999 Cadillac STS in the data used here. A recall can apply to some vehicles of a model year and not others, so check a specific vehicle by VIN at nhtsa.gov/recalls.

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 11 on record; the latest 10 are shown.

See all 11 bulletins →

Other model years of the Cadillac STS

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
2011745,5000—21—Not enough data
20091570,0000—18—Stable
20085057,5001—18Not compared (fewer than 3 comparable model years)Falling
20075255,0002—18Not compared (before 2008)Rising
200613972,5004—18Not compared (before 2008)Falling
200510157,0003—18Not compared (before 2008)Stable
200477,6750———Not enough data
2003817,6260———Not enough data
20027100,0000———Not enough data
20011232,7140———Not enough data
20001281,0001———Not enough data
19991398,5870———Not enough data

All Cadillac STS model years · Best and worst years by complaints

Frequently asked questions

How many NHTSA complaints does the 1999 Cadillac STS have?

NHTSA recorded 13 consumer complaints for the 1999 Cadillac STS as of Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 1999 Cadillac STS is reported most often?

Electrical system is named most often, in 6 complaints (46% of the total), followed by engine cooling with 6.

Has the 1999 Cadillac STS been recalled?

NHTSA lists no recall campaigns for this model year in the data used here. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

At what mileage are problems with the 1999 Cadillac STS reported?

Among the 9 complaints that include a mileage, the median is 98,587 miles and the middle half falls between 80,000 and 106,244 miles; 11% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.