Own a Cadillac CT4 in the Phoenix area? EZ Swap LLC repairs and maintains the Cadillac CT4 for model years 2020 to 2026. Our shop at 9050 N 9th St handles everything from routine service to diagnostics and major repairs.
To help CT4 owners know what to watch for, we reviewed public records from the National Highway Traffic Safety Administration (NHTSA). For these model years NHTSA has 34 owner complaints on file for the CT4 and 5 safety recall campaigns. The most-reported problem areas are engine (10), service brakes (7), power train (6).
Most-Reported Cadillac CT4 Problems
These problem areas come up most often in NHTSA owner complaints for the CT4 (all model years combined). Complaint counts reflect reports filed, not the share of vehicles affected, so popular and older models naturally have more.
| Problem area (NHTSA component) | Complaints | Share | |
|---|---|---|---|
| Engine | 10 | 29% | |
| Service Brakes | 7 | 20% | |
| Power Train | 6 | 17% | |
| Electrical System | 6 | 17% | |
| Steering | 6 | 17% | |
| Vehicle Speed Control | 5 | 14% | |
| Forward Collision Avoidance | 5 | 14% | |
| Fuel/Propulsion System | 4 | 11% |
Engine
10 of the 34 complaints (29%) mention the engine and cooling system. Engine and cooling complaints are best caught early in Phoenix, where heat pushes cooling systems and engine oil to their limits. We diagnose warning lights and check coolant, hoses and oil condition. See our check engine light diagnostics and oil change & maintenance pages.
Service Brakes
7 of the 34 complaints (20%) mention brakes. Brake complaints turn up on nearly every vehicle, and Phoenix stop-and-go traffic wears brake parts quickly. We measure pads and rotors, check calipers and fluid, and replace only what is worn. See our brake repair page.
Power Train
6 of the 34 complaints (17%) mention the powertrain. Powertrain complaints can range from rough shifting to loss of drive. We road test, scan for stored codes and inspect fluids before recommending any repair. See our auto repair page.
Cadillac CT4 Complaints by Model Year
The CT4 model years with the most NHTSA complaints on file are 2020, 2021, 2024. Older model years have had more time to collect reports, so use this table as a guide for what to inspect, not as a verdict on any one vehicle.
| Model year | Complaints on file | |
|---|---|---|
| 2020 | 8 | |
| 2021 | 7 | |
| 2022 | 6 | |
| 2023 | 3 | |
| 2024 | 7 | |
| 2025 | 2 | |
| 2026 | 1 |
Cadillac CT4 Check Engine Codes
NHTSA owner complaints rarely cite specific trouble codes for the CT4, so we do not have a model-specific ranking to show. These are the check engine codes we see most often on vehicles in Phoenix heat, and any of them can show up on a Cadillac.
| Code | What it means |
|---|---|
| P0420 | Catalyst efficiency below threshold (bank 1) Often a worn catalytic converter, but failing oxygen sensors or exhaust leaks can set it too. Can cause an emissions test failure. |
| P0300 | Random or multiple cylinder misfire Worn spark plugs, failing ignition coils, fuel or vacuum problems. Do not ignore a flashing check engine light. |
| P0171 | System too lean (bank 1) Often a vacuum leak, dirty MAF sensor, weak fuel delivery or a failing oxygen sensor. |
| P0455 | EVAP system large leak Missing or loose gas cap, or a disconnected or cracked vapor hose. |
| P0128 | Coolant temperature below thermostat regulating temperature Usually a thermostat stuck open. Fix it to restore efficiency and cabin heat. |
| P0442 | EVAP system small leak Loose or worn gas cap, cracked hose or purge or vent valve. |
| P0301 | Cylinder 1 misfire Commonly a bad spark plug or ignition coil on that cylinder. |
| P0401 | EGR flow insufficient Clogged EGR passages or a stuck EGR valve. |
Got a check engine light on your CT4? A code is a clue, not a diagnosis, so we scan it and test the system before replacing anything. See our check engine light diagnostics.
Cadillac CT4 Safety Recalls
NHTSA lists 5 recall campaigns for the CT4 in these model years, most often involving air bags, service brakes, exterior lighting. Recalls are repaired by the manufacturer at no charge to you, but each applies only to certain vehicles. Look up your VIN at nhtsa.gov/recalls.
- 2025 recall, Power Train (campaign 25V148000): 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.
- 2022 recall, Exterior Lighting (campaign 22V903000): General Motors, LLC (GM) is recalling certain 2020-2023 Cadillac CT4 and CT5; 2021-2023 Buick Envision;
- 2021 recall, Air Bags (campaign 21V611000): 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.
- 2021 recall, Air Bags (campaign 21V421000): 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.
- 2020 recall, Service Brakes (campaign 20V588000): 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.
Serious Incident Reports
Of the NHTSA complaints on file for the CT4, 2 involved a crash, 1 reported injuries. These numbers are drawn from self-reported complaints and are not verified findings. If your vehicle has an open recall, get it repaired promptly.
Keeping a Cadillac CT4 Reliable in Phoenix
Arizona heat is the hardest test a Cadillac will face. Batteries, belts, hoses, tires and engine oil all wear faster here, and a CT4 that spends its life in stop-and-go Valley traffic needs maintenance earlier than the owner's manual's normal schedule suggests.
Our recommendation for CT4 owners: follow the severe-service schedule, test the battery before every summer, inspect brakes and tires twice a year, and have any warning light diagnosed instead of ignored. If you are shopping for a used Cadillac CT4, a pre-purchase inspection shows what the paperwork does not.
Cadillac CT4 Services at EZ Swap LLC
Get the details on our Phoenix Cadillac CT4 repair service, or choose a service below.
Check Engine Light Diagnostics
Scan, test and pinpoint the real cause.
Details →Oil Change & Maintenance
Oil, filters, fluids, tires and scheduled service.
Details →Brake Repair
Pads, rotors, calipers, fluid and brake lines.
Details →Auto Repair
All makes and models, from domestic trucks to imports.
Details →Car A/C Repair
Phoenix heat demands cold air.
Details →Cadillac CT4 FAQ
What are the most common problems with the Cadillac CT4?
Based on NHTSA owner complaints, the most-reported problem areas for the Cadillac CT4 are engine (10), service brakes (7), power train (6). Complaint counts reflect reports filed, not the share of vehicles affected.
Which CT4 model years have the most complaints?
The CT4 model years with the most NHTSA complaints on file are 2020, 2021, 2024. Older years have had longer to collect reports, so inspect any specific vehicle before buying.
What check engine codes are common on the Cadillac CT4?
NHTSA complaints rarely cite specific codes for the Cadillac CT4. On Phoenix vehicles in general, we see P0420, P0300 misfires, P0171 lean conditions and EVAP leaks such as P0455 and P0442 most often. Bring yours in and we will scan and test it.
Does the Cadillac CT4 have any safety recalls?
NHTSA lists 5 recall campaigns for the Cadillac CT4 across model years 2020 to 2026. Each recall applies only to certain vehicles, so enter your VIN at nhtsa.gov/recalls to see if yours is affected.
Do you repair the Cadillac CT4 in Phoenix?
Yes. EZ Swap LLC repairs and maintains Cadillac vehicles including the CT4, at 9050 N 9th St in Phoenix. Call or text (602) 246-9063 for an appointment.
Is a pre-purchase inspection worth it for a used Cadillac CT4?
Yes. An inspection checks the engine, transmission, brakes, suspension, A/C and electrical system, and scans for stored codes, so you know the real condition before you buy.
How often should I service my Cadillac CT4 in Phoenix?
Follow the severe-service schedule in your owner's manual, since heat and stop-and-go driving count as severe use. Test the battery before summer and inspect brakes and tires regularly.
More Cadillac Models We Service
Source: public complaint and recall records from the National Highway Traffic Safety Administration (nhtsa.gov). Counts reflect reports filed and do not predict the condition of any individual vehicle.