2020 Cadillac Ct4 problems, complaints & recalls
Most-reported problem areas: Service Brakes (2) · Power Train (2) · Engine (2)
🧭 Reliability snapshot
Compared against other Cadillac Ct4 model years — complaint volume vs the model's median year, recalls and severity. How we score →
Safety recalls (4)
Power Train:automatic Transmission 2025-03-06 · campaign 25V148000 · 90,081 vehicles
Defect: General Motors LLC (GM) is recalling certain 2019-2020 Cadillac CT6, 2020-2021 CT4, CT5, and 2020-2022 Chevrolet Camaro vehicles equipped with a 10-speed transmission. The transmission may become damaged internally and cause the wheels to lock-up.
Risk: Wheel lock-up while driving increases the risk of a crash.
Fix: Dealers will install transmission control module monitoring software, free of charge. Owner notification letters were mailed April 7, 2025. Owners may contact Cadillac customer service at 1-800-333-4223 or Chevrolet customer service at 1-800-222-1020. GM's number for this recall is N242480630.
Exterior Lighting:lighting Control Module:software 2022-12-08 · campaign 22V903000 · 740,108 vehicles
Defect: General Motors, LLC (GM) is recalling certain 2020-2023 Cadillac CT4 and CT5; 2021-2023 Buick Envision; and 2022-2023 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehicles. The daytime running lights (DRLs) may not deactivate when the headlights are on. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
Risk: DRLs that do not deactivate as intended may result in a glare, reducing visibility, and increasing the risk of a crash.
Fix: The body control module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed January 23, 2023. Owners may contact GMC customer service at 1-888-988-7267, Chevrolet customer service at 1-800-222-1020, or Cadillac customer service at 1-800-458-8006. GM's number for this recall is N222386380. This recall expands previous recall number 22V-827.
Air Bags:side/Window:curtain 2021-08-05 · campaign 21V611000 · 34,157 vehicles
Defect: General Motors, LLC. (GM) is recalling certain 2020-2022 Cadillac CT4 and CT5 vehicles. The roof rail side-curtain air bags may not have been installed correctly, which could result in an improper air bag deployment during a crash.
Risk: Air bags that do not deploy properly can increase the risk of injury in a crash.
Fix: Dealers will inspect both left and right-side roof rail air bags and reinstall the air bags, as necessary, free of charge. Owner notification letters were mailed on August 30, 2021. Owners may contact Cadillac customer service at 1-800-458-8006. GM's number for this recall is N212342780.
Service Brakes 2020-09-24 · campaign 20V588000 · 3,677 vehicles
Defect: General Motors LLC (GM) is recalling certain 2020 Chevrolet Corvette and Cadillac CT4, CT5 and XT4, 2021 Chevrolet Trailblazer, and 2020-2021 Buick Encore GX vehicles. Sensor connection contamination in the electronic brake boost system may cause an interruption of communication between the sensor and the brake boost system.
Risk: If communication with the sensor is interrupted, the electronic brake boost assist could be lost. Extra pedal force will be required to slow and stop the vehicle, increasing the risk of a crash.
Fix: GM will notify owners, and dealers will replace the electronic brake boost module, free of charge. The recall began December 9, 2020. Owners may contact Chevrolet customer service at 1-800-630-2438, Cadillac customer service at 1-800-333-4223, or Buick customer service at 1-800-521-7300. GM's number for this recall is A202307260.
Service bulletins (887)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Unknown Or Other 2026-09-26 · PIT5698F · Service Bulletin/Repair Instructions
this pi provides diagnostics tips on how the lin bus works and how to diagnosis it.
Unknown Or Other 2026-09-21 · PIP5700H · Service Bulletin/Repair Instructions
this pi communicates the proper part numbers for transmission connectors and internal harness to prevent confusion when ordering
Unknown Or Other 2026-09-08 · PIC6555A · Service Bulletin/Repair Instructions
this pi advises of a procedure for a service door latch system message with no related dtcs
Unknown Or Other 2026-09-04 · PIP4902W · Service Bulletin/Repair Instructions
this preliminary information advises a dealer on how to email gds2 session logs into technical assistance.
Unknown Or Other 2026-07-24 · PIT6446A · Service Bulletin/Repair Instructions
this pi communicates information to ensure memory recall is enabled to ensure memory mirrors return to set position after curbview assist is used.
Unknown Or Other 2026-07-21 · PIT5099J · Service Bulletin/Repair Instructions
pi to help diagnose a/c concern
Showing the 6 most recent of 887 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-08-26 · Service Brakes“total brake system failure. lost almost all brake function nearly causing an accident. june 17, 2026 car was taken to dealership. electronic brake control module (ebcm), brake master cylinder, brake pedal retainer replacement required. august 7, 2026 received a call from dealer stating that ebcm replacement was faulty or failed. august 26, 2026 con…”
2026-08-25 · Engine“69,000 mile oil change i was told i needed to spend thousands of dollars on repairing an oil leak b/c my cam carrier is leaking. cadillac has a know issue with this repair and refuses to stand behind it's product. numerous complaints already on forums and yet they charge thousands to fix. a top name brand that can't produce a vehicle past 69000 m…”
2026-07-23 · Power Train“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 a…”
2026-06-23 · Service Brakes“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 …”
2026-06-08 · Power Train“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).…”
2025-05-31 · Unknown Or Other“right rear brake light is out. there is a lot of moisture in the tail light causing the lights to corrode and go out …”
2024-06-05 · Engine · 45,000 mi“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 re…”
2021-07-20 · Air Bags · 3,000 mi“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 ma…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.