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Problems · NHTSA complaints

2018 Cadillac CT6 problems

Owners filed 12 complaints about the 2018 Cadillac CT6 with NHTSA between May 2018 and Aug 2026. The most-cited component is power train (4).

Full 2018 CT6 research
Complaints
12
Filed with NHTSA
Crashes
0
Reported by owners
Fires
0
Reported by owners
Injuries
0
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Power train4
  2. Engine4
  3. Steering3
  4. Fuel/propulsion system2
  5. Suspension1
  6. Structure1
  7. Service brakes1
  8. Exterior lighting1
  9. Forward collision avoidance1
  10. Lane departure1
  11. Electronic stability control (esc)1
  12. Electrical system1

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 10, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20181
20190
20202
20212
20220
20232
20241
20251
20263

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.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Power train

4 reports
“When vehicle was purchased new there was a slight bearing wear noise at the front driver side, which grew louder with years. Noise synchronized with tire rolling rpm. Replacing (my self) front trans axle, the brake pads, shaving rotors, & wheel hub bearing did not fix noise. Next; Dealer shop reported that the AWD front transfer case (differential) had a bad bearing AND that this was a common problem with the model car. $1600 repair bill.”
Owner complaint to NHTSAFiled Aug 7, 2026Power trainODI 11755395
Get this fixed

Engine

4 reports
“The brake makes a rattling and metal grinding sound, the dealership said nothing is wrong with the brakes, still problematic. The transmission shifts too hard. Dealer said nothing wrong. Yet cat kicks too hard.”
Owner complaint to NHTSAFiled Feb 21, 2023Service brakes, EngineODI 11508253
Get this fixed

Steering

3 reports
“Yes my car was sold to me with structural damages, and I was told any of this when I purchased it!!!!”
Owner complaint to NHTSAFiled Feb 15, 2024Steering, Suspension, StructureODI 11572148
Get this fixed

Fuel/propulsion system

2 reports
“During refueling the gas station pumping nozzle would shut off indicating a full gasoline fuel tank; but, the dash board fuel gage indicated the fuel was not full. Had to dribble in fuel to fill. Dealer Mechanic found: Crash roll over gasoline vent safety valve was stuck in the crashed roll over cut off state. No gas tank ventilation. This caused back pressure in car gasoline tank to shut off gas station filler nozzle as though the car was full . Entire gas tank had to be replaced. Still under warranty.”
Owner complaint to NHTSAFiled Aug 7, 2026Fuel/propulsion systemODI 11755393
Get this fixed

Suspension

1 report
Get this fixed

Structure

1 report
Get this fixed
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.