I've owned 2 ct5 each one had their turbos go out at 55k miles each and valves bodies that need replacing around 70k for each vehicle
2020 Cadillac CT5 transmission complaints
Page 2 of 2: complaints 11 to 16 of 16, newest first, as owners wrote them.
The contact owns a 2020 Cadillac CT5. The contact stated that while driving at various speeds, the transmission was slipping while shifting gear. Additionally, the contact stated that there was a delay while shifting gear. The check engine warning light remained illuminated intermittently. The vehicle was taken to a local dealer where the vehicle was diagnosed, and the contact was advised that there was no failure found with the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure. The approximate failure mileage was 12,000.
Regarding the federal safety agency Campaign ID 25V148, GM recall N242480630. The recall was for a potential transmission control valve issue where some vehicles may be susceptible to excess wear over time, resulting in gradual loss of pressure within the valve that can cause harsh shifting. With the recall we finally knew what was wrong with the vehicle. We have a defective transmission control valve. The transmission was replaced in 2022 and now needs to be replaced again. At the appointment for the recall we expressed that the transmission control valve has already caused damage and it needs to be replaced. We also requested that the damage the defective valve caused, the failing transmission, also needs to be replaced under this recall. We were told to contact Cadillac customer support at 800‑333‑4223 and filed a case on 5/27/25, case [XXX]. I have yet to receive a call back. I call everyday and leave a message and nobody calls back. The vehicle can not be driven and they will not provide a loaner car. Please hold Cadillac accountable for using defective parts in vehicles and then not providing a remedy to the damage they have caused in a timely manner if at all. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
The contact's sister owns a 2020 Cadillac CT5. The contact stated that while his sister was driving at an undisclosed speed, the rear wheels locked up. The driver was able to pull over to the side of the road. The vehicle was towed to the dealer, where it was diagnosed and determined that the rear wheels had locked up, causing damages to the transmission. The dealer determined that the transmission needed to be replaced but at the vehicle owner's expense. The vehicle was not repaired. The contact became aware that the VIN was included in the federal safety agency Campaign Number: 25V148000 (Power Train), which the contact related to the failure; however, the contact's sister had not received the recall notification in the mail. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was unknown.
Safety Concerns and Defects: I am reporting several safety-related defects in my 2020 Cadillac CT5, which have posed serious risks to me and my family: ⸻ 1. Transmission Pump Failure: •The transmission pump failed, causing loss of power and jerking while driving at highway speeds. This occurred on[XXX] in Georgia with my two small children in the car, putting us at high risk of a crash. •No warning lights appeared, and the failure was diagnosed by the dealer (Hennessey Cadillac). 2. EVAP System Failure (P0451): •A fuel tank pressure sensor malfunctioned, triggering a check engine light shortly after purchase. This affects emissions and presents a fire risk due to potential fuel vapor leaks. •The issue was confirmed by the dealer. 3. Camshaft Solenoid Failure (P0027): •A camshaft solenoid failure was repaired by the dealer, but was not disclosed to me at purchase. •This could have caused engine stalling or hesitation. ⸻ Has the Issue Been Confirmed? •Yes, all issues have been confirmed by the dealership. The vehicle has been returned for repairs, and I can provide diagnostic and repair records. ⸻ Safety Risk and Urgency: The transmission failure almost caused a serious accident on a highway. These defects present imminent safety risks that need investigation. I believe other owners may face similar issues. ⸻ Request for the federal safety agency Action: Please investigate these defects in the 2020 Cadillac CT5, particularly the transmission pump failure, EVAP system, and engine stalling risks. Thank you for your attention to this matter. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
this vehicle has had multiple check engine failures it has been in for service six times in a matter of months. In September I had Service Traction control/StabiliTrack lights come on and the car losses of engine power. I had it serviced again in October for the same issue it was at the dealership for 20 days all they did was clear the code and drove it 38 miles, including the technician driving it home to see if the issue could be duplicated. After the 20th day they advised me to pick up my vehicle and return it when the light were actively on. I expressed to them as well as GM that I felt unsafe driving my vehicle this way as it is a great danger to my safety when the car looses power. I drive up/down a canyon as early as 3am I went from speeds of 80mph drooped down to 20-25mph due to this failure. Today I have another check engine light on the vehicle. I dont feel safe driving this vehicle at all!
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