2015 Cadillac CTS problems & reliability
46 owner complaints filed with NHTSA for the 2015 Cadillac CTS, alongside 3 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
Federal crash records (FARS 2020–2023): 2015 Cadillac CTS vehicles were involved in 9 fatal crashes with 3 occupant deaths. Involvement counts are not adjusted for how many are on the road and do not imply fault or a vehicle defect.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Power Train → | 19 | 41% |
| Service Brakes | 7 | 15% |
| Unknown OR Other | 7 | 15% |
| Suspension | 5 | 11% |
| Electrical System | 4 | 9% |
| Engine | 4 | 9% |
| Vehicle Speed Control | 4 | 9% |
| Steering | 3 | 7% |
| Wheels | 3 | 7% |
| Equipment | 2 | 4% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Mileage when problems occurred
Half of the failures with a reported odometer reading occurred by 55,750 miles (middle 50% between 29,684 and 78,500 miles), based on 24 complaints that included mileage.
Complaints by incident year
What owners report
“The contact owns a 2015 Cadillac CTS. The contact stated that while driving at undisclosed speeds, there was a loud grinding and squeaking sounds coming from the vehicle. Additionally, there was a high-pitched sound coming from the vehicle. The contact also stated that the water pump was inoperable. There were no…”
Engine · filed Jul 25, 2025
“The contact owns a 2015 Cadillac CTS. The contact stated while driving 65 MPH, the vehicle shuddered and made an abnormally loud sound. The contact exited the highway and drove to the nearest mechanic shop at a gas station. The mechanic diagnosed the vehicle and determined that the rear differential was fractured and…”
Power Train · filed Jul 16, 2025
“The contact owns a 2015 Cadillac CTS. The contact stated that occasionally while driving at various slow speeds, the message "Driver Assist Unavailable" and the steering wheel was abnormally firm, requiring excess effort to drive the vehicle until the power steering functionality returned. There was no warning light…”
Steering · filed May 2, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
1,779 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2015 Cadillac CTS. The 10 most recent:
PI to help diagnose A/C concern
PIT5099J · Service Bulletin/Repair Instructions · issued Jul 21, 2026
This preliminary information communicates information about how to determine if a wheel and tires size change is available.
PIT3271Q · Service Bulletin/Repair Instructions · issued Apr 1, 2026
This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.
PIP6104 · Service Bulletin/Repair Instructions · issued Mar 9, 2026
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
PIP4902V · Service Bulletin/Repair Instructions · issued Mar 9, 2026
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
PIP4902U · Service Bulletin/Repair Instructions · issued Jan 8, 2026
This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions…
PIT5214G · Service Bulletin/Repair Instructions · issued Nov 20, 2025
New Vehicle Monitoring Programs Section in IVH
13598 · Other · issued Sep 9, 2025
This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
PIP4902T · Service Bulletin/Repair Instructions · issued Aug 14, 2025
This Preliminary Information communication provides information to the technician about vehicles that have an intermittent no crank, no start, or start stall concern with the security light coming on. Technician may…
PIC5650M · Service Bulletin/Repair Instructions · issued Aug 7, 2025
This PI communicates a procedure to clean oil leaking from the rain sensor.
PIC6086J · Service Bulletin/Repair Instructions · issued Jun 18, 2025
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2015 Cadillac CTS has 3 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2015 Cadillac CTS?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.
- · Owners most often reported problems around 55,750 miles — budget accordingly if the car is approaching that mileage.