AI Damage2003 Cadillac STS: common problems
Owners of the 2003 Cadillac STS filed 8 complaints with NHTSA, most often about electrical system and engine and cooling. Details by component below, with sources.
Key figures
- Owner complaints
- 8
- involving a crash
- 1
What fails most often
- 1 Electrical system 38% of all complaints
- 2 Engine and cooling 38% of all complaints
- 3 Service brakes 25% of all complaints
- 4 Electronic stability control 13% of all complaints
- 5 Equipment 13% of all complaints
- 6 Exterior lighting 13% of all complaints
- 7 Fuel/propulsion system 13% of all complaints
- 8 Steering 13% of all complaints
- Electrical system: 3 complaints (38% of all).
- Engine and cooling: 3 complaints (38% of all).
- Service brakes: 2 complaints (25% of all).
- Electronic stability control: 1 complaints (13% of all).
- Equipment: 1 complaints (13% of all).
Symptoms owners describe
How many of the 8 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 3 | 0 | 0 |
| Engine and cooling | 3 | 0 | 0 |
| Service brakes | 2 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Equipment | 1 | 0 | 0 |
| Exterior lighting | 1 | 0 | 0 |
| Fuel/propulsion system | 1 | 0 | 0 |
| Steering | 1 | 0 | 0 |
| Suspension | 1 | 1 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Car scrapes front end going into or out of driveways even at slow speed 1 to 2 miles an hour. Also hits curb parking stops. My mechanic told me to take it back to the dealer I pruchased it from and the warranty should cover it.
The vehicle stalls sometimes when standing at a light or while driving the vehicle at various speeds & sometimes into a turn without warning, this incident occurred numerous times. The vehicle has not been to the dealership to be inspected. The manufacturer has not been alerted.
Simultaneously, several dash warning lights came on and stayed on, including anti-lock brake, traction and stability control warnings. Call was made to insurance company and vehicle towed to cadillac dealership.
Dt*: the contact stated while driving the vehicle at various speeds between 5 to 50 mph the engine stalled without warning, this incident occurred four times. The vehicle has not been to the dealership to be inspected. The manufacturer has not been alerted.
On june 30, 2005, I brought my 2003 cadillac seville to crest cadillac in syracuse ny complaining of brake pulsation and rumbling. It was discovered that one disk brake pad had completely separated from its backing plate, and a second set of pad and backing plate was about to separate.
There were engine problems/stalling, air bag light had come on, the radio cuts on by itself, horn was inoperative, engine light would come on, and steering wheel locked up. Recall #0311500 in re: cadillac cts. Scc
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 11,896 of 36,656 model years in the NHTSA data (top 32% most complained about).
On average one model year of the STS has 31 complaints (14 years in the data). This year has 8, below average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
- Electronic stability control. ABS/ESC sensors, steering angle, codes after suspension repair.
Other years of this model
Questions and answers
What are the most common problems with the 2003 Cadillac STS?
Owner complaints to NHTSA most often mention: electrical system, engine and cooling, service brakes. Total complaints: 8. The most frequent symptoms in complaint texts: stalls while driving (50%), airbag warning light (13%), headlights and tail lights (13%).
How many service bulletins (TSB) were issued for the 2003 Cadillac STS?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2003 Cadillac STS from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2003 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.