Problems · NHTSA complaints
2005 Cadillac STS problems
Owners filed 101 complaints about the 2005 Cadillac STS with NHTSA between Jun 2005 and Jan 2025. The most-cited component is electrical system (23).
Complaints
101
Filed with NHTSA
Crashes
13
Reported by owners
Fires
4
Reported by owners
Injuries
4
People reported injured
Deaths
0
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Electrical system23
- Power train18
- Engine12
- Air bags11
- Engine and engine cooling7
- Seats6
- Vehicle speed control6
- Suspension5
- Service brakes5
- Fuel/propulsion system5
- Exterior lighting5
- Structure5
- Visibility5
- Steering4
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 11, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
7
7
7
7
7
5
7
3
5
18
6
5
3
3
7
1
0
1
1
0
1
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 2005 | 7 |
| 2006 | 7 |
| 2007 | 7 |
| 2008 | 7 |
| 2009 | 7 |
| 2010 | 5 |
| 2011 | 7 |
| 2012 | 3 |
| 2013 | 5 |
| 2014 | 18 |
| 2015 | 6 |
| 2016 | 5 |
| 2017 | 3 |
| 2018 | 3 |
| 2019 | 7 |
| 2020 | 1 |
| 2021 | 0 |
| 2022 | 1 |
| 2023 | 1 |
| 2024 | 0 |
| 2025 | 1 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Electrical system
23 reports3 crashes3 fires
“WAS DRIVING LOW BEAM LIGHTS WENT OUT SMELLED WIRES BURNING LEFT SIDE WIRE HARNESS WAS MELTING I WAS ON MY WAY HOME ON HIGHWAY 51 NORTH AT AROUND D 10:45 IN THE EVENING”
Power train
18 reports2 crashes1 fire1 related recall
“The contact owns a 2005 Cadillac STS. The contact stated that while the vehicle was parked in the driveway, the contact became aware of a fluid leak. There was no warning light illuminated. The vehicle was driven to an independent mechanic where it was diagnosed with a pinion seal leak on the rear axle. The local dealer was contacted; however, the vehicle was not repaired because the vehicle was not under recall. The manufacturer was made aware of the failure. The failure mileage was approximately 92,721.”
Engine
12 reports
“THE VEHICLE INTERMITTENTLY LOSES ENGINE/ ELECTRICAL POWER WHILE DRIVING. WHEN THE POWER LOSS OCCURS, BRAKES AND STEERING LOSE PROPER FUNCTIONALITY CREATING A THREAT TO THE DRIVER AND PASSENGERS AS WELL AS OTHER MOTORISTS. THE VEHICLE THEN IS UNRESPONSIVE TO THE PROPER STARTING PROCEDURE. RESTARTING THE VEHICLE IS INCONSISTENT. IT MAY START IMMEDIATELY UPON COMMAND OR IT MAY CAUSE A THEFT PROCEDURE TO INITIATE. THE VEHICLES DIC WILL POSSIBLY SHOW THE FOLLOWING PROMPTS JUST BEFORE THE SHUTDOWN FAILURE OCCURS; SERVICE VEHICLE SOON, SERVICE STABILITY SYSTEM SOON, SERVICE A/C SYSTEM SOON. DURING THE SHUTDOWN FAILURE, NO ELECTRICAL COMPONENTS ARE OPERABLE BUT POWER IS STILL AVAILABLE TO THE CAR ALLOWING THE DIC TO PROMPT 'NO FOB DETECTED' OR 'THEFT ATTEMPTED' AND THE FOB WILL INTERMITTENTLY ALLOW YOU TO SEND LOCK/ UNLOCK COMMANDS DURING THE SHUTDOWN FAILURE. THE FAILURE HAPPENS IN ANY SCENARIO AND IS INTERMITTENT IN THE ASPECT OF NO FAILURE OCCURS FOR A WEEK OR 5 FAILURES OCCUR IN A DAY. I CANNOT DETERMINE WHEN THE FAILURES BEGAN HAPPENING CONSIDERING I PURCHASED THE VEHICLE USED WITH 155000 MILES AND THE FAILURES HAVE BEEN HAPPENING SINCE DAY 3 OF MY OWNERSHIP. THE…”
Air bags
11 reports2 crashes
“THE SERVICE AIRBAG LIGHT IS NOW ON AND I NOTICE NUMEROUS OTHER COMPLAINTS FOR THIS VEHICLE INCLUDING INJURIES. CADILLAC DEALER SAYS THEY WISH TO CHARGE FOR DIAGNOSTICS AND BELIEVE IT IS A SEAT-BELT PRETENSIONER WHICH THEY WOULD NOT COVER. REPAIRS WOULD BE AS MUCH AS VEHICLE VALUE. I NOTICE A RECALL WAS ORDERED FOR VEHICLES ONE OR TWO YEARS NEWER WITH THE EXACT SAME ISSUE. WHY NOT EXTEND TO THIS YEARS SAME VEHICLE MODEL. *TR”
Engine and engine cooling
7 reports1 crash
“S10 APPROPRIATE HANDLING- LETTER TO THE SECRETARY FROM CONSTITUENT RE COPY OF A LETTER ADDRESSED TO GENERAL MOTORS CHIEF EXECUTIVE OFFICER MARY BARRA REGARDING THE RECALL OF VEHICLES THAT CAN LEAK OIL AND CATCH FIRE. *SMD THE CONSUMER STATED THE TECHNICIAN SHOWED HIM WHERE BURNT OIL HAD LEAKED THROUGH ENGINE GASKETS BETWEEN THE CRANKCASE AND MANIFOLD. THE CONSUMER WAS QUOTED A PRICE OF $ 4,153.00 FOR THE REPLACEMENT OF THE GASKETS. THE PRICE WENT UP, AFTER THE REPAIRS WERE IN PROGRESS. THE CONSUMER WAS INFORMED ADDITIONAL GASKETS WERE NEEDED. *JB”
Seats
6 reports2 fires
“WHEN I MOVE THE DRIVER'S SEAT THE "AIRBAG" SYMBOL APPEARS ON THE DASHBOARD. IF I MOVE THE SEAT BACK AND FORTH , AFTER A FEW TRIES, THE "AIRBAG" SYMBOL DISAPPEARS. I WAS NOT ABLE TO LOOK UNDER THE SEAT, BUT I HAVE SEEN A VIDEO WHERE SOMEBODY HAD THE EXACT SAME PROBLEM BUT FOUND BURNT WIRES UNDER THE SEAT. I AM WONDERING IF THERE IS A FIRE HAZARD. THIS HAPPENED WHEN THE CAR IS STATIONARY.”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 11, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.