Total Complaints
7 filings
CADILLAC SLS · model year
1999 CADILLAC SLS
7 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 1999CADILLACSLS carries 7 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 1 fire, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 1999 SLS is engine and engine cooling:engine with 2 filings, followed by electrical system (2) and service brakes, hydraulic (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 10 investigation files overlapping the 1999 SLS, and 1 remain open. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
7
Complaints
0
Crashes
1
Fires
0
Injuries
0
Deaths
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
Complaints vs. fleet median (215)
At or below the fleet median complaint volume.
Complaints by Component
| Component | Count |
|---|---|
| ENGINE AND ENGINE COOLING:ENGINE | 2 |
| ELECTRICAL SYSTEM | 2 |
| SERVICE BRAKES, HYDRAULIC | 1 |
| ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC) | 1 |
| FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM | 1 |
Recent Complaints
20140410ELECTRICAL SYSTEM
WHILE MY WIFE WAS DRIVING THE CAR AT ABOUT 38 MILES AN HOUR THE CAR JUST DIED OR CUT OUT ( THE IGNITION SYSTEM QUIT ), ON HER. THIS HAPPENED ON TWO DIFFERENT TIMES FOR HER AND ONCE FOR MYSELF. *TR
Mileage: 52,969
20120103ELECTRICAL SYSTEM
IT WAS DETERMINED BY MY LOCAL CADILLAC SERVICE DEPARTMENT THAT THE ALTERNATOR WAS FAULTY, DRAWING EXCESSIVE CURRENT WHILE THE ENGINE WAS OFF. I MENTIONED THE RECALL ON THIS MODEL AND THEY SAID IT HAD ALREADY BEEN REPLACED SO IT IS NOT COVERED. I FEEL THAT THIS IS AN ONGOING PROBLEM AND SHOULD BE REPLACED UNDER THIS PROGRAM. *TR
20100202ENGINE AND ENGINE COOLING:ENGINE
BOUGHT AUTO 2003,AFTER 3MO AUTO ENGINE WOULD SHUT OFF WITHOUT WARNING AT ANY SPEED,HIGHWAY OR IN DRIVEWAY. TOOK AUTO TO DEALER AND AUTO KEPT FOR 3 DAYS AND DEALER UNABLE TO DUPLICATE PROBLEM. TOOK AUTO BACK 5 OTHER TIMES AND SAME RESULTS EACH TIME. COMPLETE TUNEUP WAS DONE THAT COST OVER $500.00 DOLLARS ,VACUUM HOSES REPLACED,IGNITION INSPECTED ,COMPLETE COMPUTER DIAGNOSTIC ELECTRICAL COMPONENT CHECKS. AUTO STILL DIES WITHOUT WARNING. SOMETIME WITHIN 2WKS AND SOMETIMES WITHIN 2MOS. *TR
Mileage: 45,000
20071124FireFUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM
UPON STARTING MY CAR THEIR WAS A BACK-FIRE UNDER THE HOOD. I AGAIN STARTED THE CAR AND DROVE ABOUT TWO MILES TO MY HOME AND PARKED THE CAR IN THE GARAGE. I THEN ENTERED THE HOUSE THROUGH THE GARAGE DOOR AND STARTED LOOKING FOR RECEIPTS FOR CHARGES I MADE AT THE GROCERY STORE AND CHARGES I MADE REFUELING THE CAR. I WAS UNABLE TO FIND THE CHARGES MADE AT THE GAS STATION. I THEN RETURNED TO THE GARAGE TO LOOK IN THE VEHICLE FOR THE RECEIPT. AT THIS TIME I NOTICED SMOKE COMING FROM UNDER THE HOOD OF THE CAR. I OPENED THE HOOD TO FIND THE INSULATION SMOLDERING THAT IS ATTACHED TO THE HOOD OF THE AUTOMOBILE. I THEN GRABBED A SPONGE AND SOAKED IT IN A PAIL OF WATER THAT WAS IN THE SET-TUB LOCATED IN THE GARAGE. I PUT OUT THE FIRE THAT WAS NOW STARTING TO BURN UNDER THE HOOD. I CAN ONLY IMAGINE WHAT MIGHT HAVE HAPPENED IF I DIDN'T LOOK FOR THE RECEIPT AT THAT TIME SEEING AS HOW THE GARAGE IS UNDER THE ROOF OF MY HOME. NOTE: I HAD NOTICED ONCE BEFORE THAT PART OF THE INSULATION HAD BURNED UND
Mileage: 81,270
20060824SERVICE BRAKES, HYDRAULIC
WHEN I FIRST PURCHASED THE CAR IT HAD A CRACKED HEAD AND MANY OTHER MINOR PROBLEMS. I REPEATEDLY BROUGHT IT BACK TO THE DEALERSHIP AND THEY TOLD ME THAT THERE WAS NOTHING WRONG WITH THE CAR. I AM STILL EXPERIENCING A "CHECK GAS CAP" WARNING AND I HEAR A CLICKING NOISE COMING FROM THE REAR RIGHT SIDE EVERYTIME I APPLY THE BRAKES. ALSO I HEAR A RATTLING NOISE EVERYTIME I HIT ANY SIZE OF BUMP. *JB
Mileage: 80,000
20060824ENGINE AND ENGINE COOLING:ENGINE
WHEN I FIRST PURCHASED THE CAR IT HAD A CRACKED HEAD AND MANY OTHER MINOR PROBLEMS. I REPEATEDLY BROUGHT IT BACK TO THE DEALERSHIP AND THEY TOLD ME THAT THERE WAS NOTHING WRONG WITH THE CAR. I AM STILL EXPERIENCING A "CHECK GAS CAP" WARNING AND I HEAR A CLICKING NOISE COMING FROM THE REAR RIGHT SIDE EVERYTIME I APPLY THE BRAKES. ALSO I HEAR A RATTLING NOISE EVERYTIME I HIT ANY SIZE OF BUMP. *JB
Mileage: 80,000
20060824ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC)
WHEN I FIRST PURCHASED THE CAR IT HAD A CRACKED HEAD AND MANY OTHER MINOR PROBLEMS. I REPEATEDLY BROUGHT IT BACK TO THE DEALERSHIP AND THEY TOLD ME THAT THERE WAS NOTHING WRONG WITH THE CAR. I AM STILL EXPERIENCING A "CHECK GAS CAP" WARNING AND I HEAR A CLICKING NOISE COMING FROM THE REAR RIGHT SIDE EVERYTIME I APPLY THE BRAKES. ALSO I HEAR A RATTLING NOISE EVERYTIME I HIT ANY SIZE OF BUMP. *JB
Mileage: 80,000
Compare 1999CADILLACSLS to Similar Vehicles
NHTSA Investigations 1 Open
PE24011Preliminary EvaluationOpen
Electronic Brake Module Component Failure
PE22006Preliminary EvaluationClosed
Rear-View Camera Failure
PE19001Preliminary EvaluationClosed
Roof Skin Separation While Driving
EQ11001EQClosed
IEE Passenger Sensing System Mats
EA07017Engineering AnalysisClosed
REAR DRIVETRAIN COMPONENT FAILURE
Frequently Asked Questions
How many complaints does the 1999 CADILLAC SLS have?▼
The 1999 CADILLAC SLS has 7 NHTSA complaints, 0 crashes, 1 fires, 0 injuries, and 0 deaths reported.
What are the most common problems with the 1999 CADILLAC SLS?▼
The most-complained component for the 1999 CADILLAC SLS is ENGINE AND ENGINE COOLING:ENGINE with 2 complaints. Other frequently reported areas include ELECTRICAL SYSTEM and SERVICE BRAKES, HYDRAULIC.
Is the 1999 CADILLAC SLS safe to buy?▼
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?▼
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.
Vehicle Safety Guides
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.