Most common 2018 Chevrolet Sonic problems
Share of the 15 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Chevrolet Sonic complaints by model year
Best Sonic years: 2019, 2018, 2020. Years to avoid: 2012, 2013. Compare all years →
2018 Chevrolet Sonic recalls (1)
Seats
General Motors LLC (GM) is recalling certain 2018 Chevrolet Sonic vehicles. A joint in the driver's seat-back frame may not be properly welded, reducing the strength of the seat-back frame.
Remedy: GM will notify owners, and dealers will replace the driver's seat-back, free of charge. The recall began June 28, 2018. Owners may contact Chevrolet customer service at 1-800-222-1020.
What 2018 Chevrolet Sonic owners say
Electrical system
The has as well as mileage is not accurate and it constantly changes even while not driving which is adding more miles to car than actually is and you will never know how much gas you have in car truly which is safety concern especially if you are driving on interstate and can't tell how much gas you have in car and suddenly run out of gas while other are behind you going 70 mph which can cause a wreck
My 2018 Chevrolet Sonic 1.8L has experienced repeated complete battery discharge and electrical failures over approximately two years. The factory infotainment system does not consistently shut down after the ignition is turned off. I must follow a specific shutdown procedure or occasionally remove the infotainment fuse to prevent battery drain. On October 10, 2026, after a three-day trip, the vehicle was completely dead. My 2,000-amp portable jump starter could not start it. Another running vehicle had to supply power before it would start. The vehicle then operated and restarted normally for approximately three days. On October 13, 2026, after several successful starts, I parked at 10 AM. By 4 PM, the vehicle produced rapid clicking sounds, then lost all electrical power. My jump starter again failed. …
Engine & cooling
The contact owns a 2018 Chevrolet Sonic. The contact stated that while driving at an undisclosed speed, the engine was idling roughly. The contact stated that the check engine warning light was illuminated. Additionally, the contact stated that the vehicle was consuming an excessive amount of fuel. The contact stated that the canister purge valve had previously been replaced, but the failure persisted. The vehicle was taken to an independent mechanic, who determined that the canister purge valve needed to be replaced a second time. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 85,000.
The contact owns a 2018 Chevrolet Sonic. The contact stated that operating the vehicle, the front driver side seat would erroneously slide forward causing the driver's knees to make contact with the dash panel. In addition, while driving at various speeds the vehicle had suddenly stalled. The vehicle was taken to the local dealer who diagnosed that the electronic control unit hardware was faulty. Also, the emergency brake cable was hanging low to the ground under the vehicle. The vehicle was not repaired. The local dealer was notified of the failures. The manufacturer was not contacted. The failure mileage was 28,000.
2018 Chevrolet Sonic engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 1.4L 4-cyl turbo | 6-speed manual | FWD | 28 / 37 / 32 |
| 1.4L 4-cyl turbo | 6-speed automatic | FWD | 27 / 35 / 30 |
| 1.8L 4-cyl | 5-speed manual | FWD | 26 / 35 / 29 |
| 1.8L 4-cyl | 6-speed automatic | FWD | 25 / 34 / 28 |
EPA ratings. Class: Compact car.
Frequently asked questions
Is the 2018 Chevrolet Sonic a good car?
Based on 15 owner complaints filed with NHTSA, the 2018 Sonic rates better than average: 87% fewer complaints than a typical year of the Sonic at the same age. It is one of the best Sonic years by this measure. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2018 Chevrolet Sonic?
The electrical system — 6 complaints, 40% of all complaints for this model year. Next are the engine & cooling (4) and seats (2).
How many recalls does the 2018 Chevrolet Sonic have?
There is 1 recall for the 2018 Chevrolet Sonic, the most recent from May 27, 2018 (seats). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Chevrolet Sonic?
The best years by complaints, compared at the same age, are 2019, 2018 and 2020. Years to avoid or approach with caution: 2012 and 2013. See the full Chevrolet Sonic years comparison.
At what mileage do 2018 Chevrolet Sonic problems happen?
The median mileage reported in complaints is about 28,000 miles; 75% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.