RoadVitals

2020 Cadillac CT4 Owner Complaints

Reports submitted to NHTSA by owners and drivers, shown in full

Data refreshed

Complaints on fileComplaints are reports submitted to NHTSA by owners and drivers. NHTSA does not verify most reports before publishing them, and a complaint does not establish that a defect exists. Volume is influenced by how many of a vehicle were sold, how long it has been on the road, and how much attention an issue has received.
6
+1 complaint in 30 days
Crash or fire reportedComplaints whose submitter recorded that a crash or a fire occurred. These are the reporter's own answers on the NHTSA form, not verified findings.
0
Filed in the last 12 monthsReports filed with NHTSA in the trailing 365 days. Recent volume reflects attention and vehicle age as much as anything else.
3
Reports on file since Jul 20, 2021

What this page shows

Our database holds 6 NHTSA owner-reported complaints for the 2020 Cadillac CT4. Each one is a report filed by an owner or driver and published by NHTSA without most of them being verified. A complaint is not a confirmed defect, not a recall and not a manufacturer bulletin. Narratives are shown exactly as filed.

Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.

Complaints, most recent first

Showing 1–6 of 6

Powertrain (other)
Filed Jul 23, 2026

I had two incidents with the Cadillac CT-4 in February and then again in April of 2026 of driving on I-75 at a highway speed of about 70 MPH when the vehicle suddenly downshifted and the engine revving at at very high RPM. The vehicle slowed down suddenly and it felt for a moment that I could not control the speed. The check engine light was on and the diagnostic indicated a transmission/engineer problem and to take in to service within a day. Both incidents in February and April felt the same. Both times I pulled over to the shoulder to shut the engine. I waited and in February it restarted without the engineer revving high. In April, it still revved high. When I took it to Ed Morse Cadillac in [XXX] in February 28, they indicated that it was a water pump failure and they replaced the water pump. I expressed that it was odd that a water pump could affect the vehicle engineer/transmission like it did when engine overheating is usually a warning of a water pump problem. The Odometer was at 73000 just over the 70000 warranty and Cadillac HQ agreed to pay for the repair. However, I continued to have the transmission problem or check engine light problem. I took it back several more times for the check engine light and even paid for a diagnostic. Ultimately, I had the same sudden downshift high engine rev on May 6th and brought it to the Brandon Cadillac again. This time they gave me a loaner and kept the car for a week and told me it was the transmission and that the core component would need to be replaced. The bill was for $4,449.83 for the repair on May 20, 2026. This time Cadillac HQ would not cover the repair even though there were other Cadiilacs with similar transmission issues. The Caddillac HQ Case Number is #XXX INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID
11752429
Incident
Feb 28, 2026
Brakes
Filed Jun 23, 2026

The electronic brake control module, break retainer, brake master cylinder and brake valve all failed. I was driving to lunch and coming down a hill when multiple warning lights turned on as I pressed the brakes. I had almost no braking power as I approached a stop sign that lets you enter a highway almost causing me to drive through the stop sign and into cross traffic. I had enough bearings to down shift it and slow it down enough to stop. If I have went through the stop sign, it could have been a fatal accident. The vehicle is at a GM dealership currently with all active codes and faulty equipment. I contacted GM and tried to get some help with this issue and they refuse to help since it is not on the recall list. There is a recall on these exact same parts on the exact same vehicle, GM said its VIN specific. The problem is still current. This vehicle is a major safety risk that obviously should have been included in the recall. There was no warning or no symptoms of this issue until the failure in the moment.

NHTSA ID
11745985
Incident
Jun 17, 2026
EngineFuel systemPowertrain (other)
Filed Jun 8, 2026

The vehicle shudders and loses power when accelerating fast. My wife almost got hit when she pulled out in traffic the car stalled out. It is due to the cylinder deactivation (afm).

NHTSA ID
11742821
Incident
Jan 6, 2026
Filed May 31, 2025

Right rear brake light is out. There is a lot of moisture in the tail light causing the lights to corrode and go out

NHTSA ID
11664086
Incident
May 12, 2025
Engine
Filed Jun 5, 2024

The contact owns a 2020 Cadillac CT4. The contact stated while driving 70 MPH, on several occasions, the vehicle failed to accelerate, hesitated, and then stalled. The vehicle was towed on three occasions to the local dealer, who was unable to determine the cause of the failure. There were no DTC codes retrieved. The vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 45,000.

NHTSA ID
11592549
Incident
Jun 3, 2024
Mileage
45,000 mi
Airbags
Filed Jul 20, 2021

The contact owns a 2014 Cadillac CT4. The contact stated that the "Service Safety Restraint System" message was displayed on the instrument panel while driving. The vehicle was taken to the dealer who diagnosed that the air bags needed to be replaced. The vehicle was not repaired due to the parts not yet being available. The manufacturer was not made aware of the failure. The approximate failure mileage was 3,000.

NHTSA ID
11425658
Incident
May 15, 2021
Mileage
3,000 mi

Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.

Data sources

Data on this page last refreshed .