2021 Cadillac Ct4 problems, complaints & recalls
Most-reported problem areas: Vehicle Speed Control (1) · Tires:sidewall (1) · Suspension (1)
🧭 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.
Air Bags:srs Malfunction Warning Lamp/Light 2021-06-10 · campaign 21V421000 · 285,622 vehicles
Defect: General Motors, LLC (GM) is recalling certain 2021 Buick Envision, Cadillac CT4, CT5, Escalade, Escalade ESV, Chevrolet Tahoe, Corvette, Suburban, GMC Yukon, Yukon XL vehicles. The communications gateway module incorrectly processes a loss of communication with the sensing diagnostic module (SDM), causing the air bag malfunction indicator light to inconsistently illuminate.
Risk: The air bag malfunction indicator light may fail to warn the driver of a problem with the air bag, increasing the risk of injury.
Fix: The communications gateway module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters were mailed on July 1, 2021. Owners may contact Buick customer service at 1-800-521-7300, Cadillac customer service at 1-800-458-8006, Chevrolet customer service at 1-800-222-1020, or GMC customer service at 1-800-462-8782. GM's number for this recall is N212338110.
Service bulletins (814)
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 2026-08-20 · PIC6551C · Service Bulletin/Repair Instructions
this preliminary information communicates to dealer to perform a mec reset for wireless projection issues
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.
Showing the 6 most recent of 814 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-06-29 · Vehicle Speed Control“while driving at highway speeds on the freeway in my 2021 cadillac ct4-v, the vehicle experienced a sudden, catastrophic loss of propulsion. without warning, the transmission dropped out of gear as if it were in neutral. i completely lost the ability to accelerate, creating an immediate, life-threatening hazard as i was left stranded and blocking h…”
2026-05-31 · Fuel/Propulsion System“check engine light for p1467 on a 2021 ct4 v. this is for a "purge pump underspeed" issue. the issue is known on ct4 cadillacs and has an active recall out: n242441120 evaporative emissions purge pump. this recall is only for the 2.0, lsy engines, but the much more uncommon 2.7, l3b engine in my car uses the same part # for the purge pump. it feel…”
2025-08-27 · Power Train“there is a known issue with hesitation and hard shifting on my vehicle. according to the gm bulletin that was released i believe in may of 25 my year, make and model has a known issue where the transmission control valve may stick or wear causing jerking and shifting issues and could cause a possible crash. according to the bulletin by gm the fix i…”
2025-04-16 · Engine“valve body failed and was supposedly repaired. i had the car 1 day and valve body failed again. my car has been in the shop since november 4, 2024 with no estimated time of repair because no parts are available. i was told they would replace the transmission. that has not happened yet. no parts available. my car has been disable for 6 months.…”
2024-04-30 · Suspension“engine and transmission for the second time in 90 days apart. supposedly be a new part. i don’t think so.…”
2024-01-24 · Steering“while driving the power steering was lost. the the auto hold function lit up. the collision warning light lit up. the stabilitrak system lit up. the air bag safety system lit up. steering became very hard and made for y safe driving. later that day 01-22-24, all warning light went out and power steering was normal. …”
2022-06-23 · Tires:sidewall“235 40 80 run flat both front and rear passenger tires no damage to rim less that 10k miles…”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.