If you’re wondering which cars are among the most unreliable to own, the answer depends on the model year and reliability data. Based on Consumer Reports’ latest predicted-reliability rankings, five of the lowest-rated models are the GMC Acadia, Rivian R1T, Chevrolet Blazer EV, Mazda CX-90 Plug-in Hybrid, and Genesis GV60.
Consumer Reports’ rankings evaluate potential problems across areas such as engines, transmissions, electrical systems, EV batteries, charging systems, climate controls, and in-car electronics.
A low reliability score does not mean every vehicle will fail. Individual condition, maintenance history, mileage, recalls, and model year can make a significant difference.
The Top 5 Most Unreliable Cars
| Rank | Vehicle | Reliability Score |
| 1 | GMC Acadia | 14 |
| 2 | Rivian R1T | 18 |
| 3 | Chevrolet Blazer EV | 19 |
| 4 | Mazda CX-90 Plug-in Hybrid | 20 |
| 5 | Genesis GV60 | 21 |
Consumer Reports uses a 1–100 scale, with higher scores indicating better predicted reliability. These vehicles were among the lowest-rated in its latest ranking.
1. GMC Acadia
The GMC Acadia ranks at the bottom with a predicted reliability score of 14. This midsize SUV appeals to families because of its passenger space, cargo capacity, and comfortable driving position.
Potential trouble areas in modern vehicles can include:
- Electrical accessories
- In-car electronics
- Climate systems
- Powertrain components
- Steering and suspension
- Software and controls
Repeated electrical or mechanical problems can lead to diagnostic fees, parts costs, labor charges, and multiple repair visits.
A low score doesn’t automatically make every Acadia a bad purchase. A well-maintained example with a strong service history may still be worth considering, but buyers should research the specific model year carefully.
2. Rivian R1T
The Rivian R1T received a predicted reliability score of 18. This all-electric pickup uses sophisticated technology and a relatively new vehicle platform.
Potential problem areas can include:
- EV battery systems
- Charging
- Climate systems
- Brakes
- Electrical accessories
- Electronics
- Body hardware
- Paint and trim
- Noises and leaks
Electric vehicles have fewer traditional engine components but still rely on batteries, electric motors, power electronics, computers, sensors, cooling systems, and software.
Therefore, fewer mechanical parts do not necessarily guarantee better overall reliability.
3. Chevrolet Blazer EV
The Chevrolet Blazer EV received a predicted reliability score of 19.
Like many newer vehicles, the Blazer EV combines a modern platform with extensive software and electronics. New vehicle launches can sometimes experience reliability problems while manufacturers identify and correct early issues.
Used buyers should check:
- Charging performance
- Software updates
- Warning lights
- Climate control
- Infotainment
- Electrical functions
- Battery-related warnings
- Service records
A professional inspection and diagnostic scan can be especially valuable before purchasing a used EV.
4. Mazda CX-90 Plug-in Hybrid
The Mazda CX-90 Plug-in Hybrid scored 20 for predicted reliability.
Plug-in hybrids can be mechanically complex because they combine gasoline and electric propulsion. The vehicle may contain a gasoline engine, electric motor, high-voltage battery, charging equipment, regenerative braking, power electronics, and computer-controlled systems.
Consumer Reports has found that plug-in hybrids can produce more mixed reliability results than conventional hybrids.
That doesn’t mean every CX-90 Plug-in Hybrid will have problems. Buyers should focus on the specific model year, maintenance history, recalls, and condition.
5. Genesis GV60
The Genesis GV60 completes the list with a predicted reliability score of 21.
This premium EV includes advanced electronics, driver-assistance technology, charging equipment, and electric powertrain components.
Potential trouble areas include:
- EV battery systems
- Charging
- Electronics
- Climate systems
- Electrical accessories
- Body hardware
Premium vehicles can also have higher repair costs because specialized components and diagnostic procedures may be more expensive.
Are These Really the Worst Cars to Own?
Not necessarily.
A low reliability rating does not mean a vehicle is unsafe or guaranteed to break down. Reliability surveys measure reported problems across many vehicles and owners.
Model year also matters. Manufacturers regularly update software, engines, transmissions, wiring, sensors, and other components. A problem affecting one year may be corrected in another.
For used-car shoppers, researching the specific year, engine, transmission, and powertrain is more useful than judging an entire model by one rating.
Why Are Some New Cars Less Reliable?
Modern cars are more technologically advanced than ever. They may contain dozens of computers, hundreds of sensors, advanced driver-assistance systems, large infotainment systems, turbocharged engines, hybrid systems, and complex transmissions.
More technology creates additional components that can potentially fail.
Today’s reliability problems aren’t limited to engines and transmissions. They can also involve software, sensors, wiring, control modules, cameras, displays, and communication systems.
Are Electric Cars Less Reliable Than Gas Cars?
Not necessarily. Recent reliability research has shown more mixed results for EVs and plug-in hybrids, while conventional hybrids have generally performed well.
The powertrain alone shouldn’t determine whether you buy a vehicle. Reliability varies significantly from one model to another.
Common Causes of Car Reliability Problems
Electrical Problems
Faulty sensors, wiring, modules, batteries, and electrical connections can cause intermittent or difficult-to-diagnose problems.
Transmission Problems
Transmission repairs can be expensive because modern transmissions contain numerous mechanical, hydraulic, and electronic components.
Engine Problems
Oil consumption, cooling-system failures, timing-system issues, turbocharger problems, and internal engine damage can result in major repair bills.
Electronics and Software
Infotainment systems, cameras, displays, sensors, and software-controlled features are increasingly common sources of vehicle problems.
How Much Can an Unreliable Car Cost?
Repair costs vary significantly by vehicle and failure type.
| Problem | Potential Repair Range |
| Electrical repair | $150–$2,000+ |
| Sensor/module replacement | $200–$1,500+ |
| Suspension repair | $500–$3,000+ |
| AC repair | $300–$3,000+ |
| Transmission repair | $2,500–$8,000+ |
| Engine replacement | $4,000–$12,000+ |
| EV battery-related repair | $1,000–$15,000+ |
These are broad estimates and actual prices depend on parts, labor, vehicle type, and the extent of the damage.
How to Avoid Buying an Unreliable Used Car
Before buying a used vehicle:
- Research the specific model year. Reliability can change after redesigns and updates.
- Review maintenance records. Look for regular oil changes, fluid services, brake work, and scheduled maintenance.
- Check recalls. Make sure outstanding safety or manufacturer recalls are addressed.
- Get a pre-purchase inspection. Have a professional examine the engine, transmission, brakes, suspension, electrical systems, and undercarriage.
- Test-drive carefully. Watch for warning lights, unusual noises, harsh shifting, vibrations, overheating, and electrical glitches.
- Consider repair costs. Luxury and specialized vehicles can cost more to repair even when the problem is relatively minor.
Frequently Asked Questions
What are the top 5 most unreliable cars?
Based on Consumer Reports’ latest predicted-reliability rankings, five of the lowest-rated models are the GMC Acadia, Rivian R1T, Chevrolet Blazer EV, Mazda CX-90 Plug-in Hybrid, and Genesis GV60.
What is the #1 most unreliable car?
The GMC Acadia received the lowest predicted reliability score among these vehicles, with a score of 14.
Does an unreliable car always break down?
No. Reliability ratings reflect patterns across many vehicles. Individual cars can perform much better or worse depending on maintenance, mileage, condition, and previous repairs.
Are electric vehicles less reliable?
Not universally. EV and plug-in hybrid reliability has been more mixed in recent surveys, but individual models can vary considerably.
What should I check before buying a used car?
Research the model year, maintenance history, recalls, vehicle history, current condition, and expected repair costs. A professional pre-purchase inspection is also recommended.
Is buying an unreliable car ever worth it?
It can be, especially if the vehicle is affordable, has warranty coverage, a strong maintenance history, or features you value. However, you should be prepared for potentially higher repair costs.
Conclusion
So, what are the top 5 most unreliable cars? Based on Consumer Reports’ latest predicted-reliability data, five models near the bottom are the GMC Acadia, Rivian R1T, Chevrolet Blazer EV, Mazda CX-90 Plug-in Hybrid, and Genesis GV60.
However, a reliability ranking shouldn’t be treated as a simple “never buy” list. The specific model year, maintenance history, current condition, warranty, and expected repair costs are all important.
If you’re buying a used vehicle, a professional inspection can help uncover problems before you purchase. If your current vehicle is already experiencing issues, an accurate diagnosis can help determine whether repairing it makes financial sense.
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