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What 114 owners told NHTSA about the 2015 Chevrolet Sonic

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (114)Crash / fire / injury (19)Electrical system (34)Airbags (27)Engine (23)Fuel system (12)Transmission & drivetrain (12)Steering (6)Brakes (5)Electronic Stability Control (esc) (4)Equipment (4)Engine & cooling (3)

3 of 114 complaints match · Engine & cooling · clear filters

Feb 3, 2025Engine & cooling

The contact owns a 2015 Chevrolet Sonic. The contact stated that while operating the vehicle, the check engine light remained illuminated. The vehicle was taken to the local mechanic who diagnosed that the catalytic converter was faulty and needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was offered. The local dealer was not contacted. The failure mileage was 115,000.

NHTSA ODI 11640293

Oct 19, 2022Engine & cooling

The contact owns a 2015 Chevrolet Sonic. The contact stated that while operating the vehicle, the odor of exhaust fumes was present inside the cabin of the vehicle. The vehicle was taken to an independent mechanic who diagnosed that the catalytic converter was faulty and needed to be replaced. The vehicle was not yet repaired. The local dealer was notified of the failure, but no assistance was offered. The manufacturer was not yet notified of the failure. The VIN was not available. The failure mileage 86,000.

NHTSA ODI 11490021

Dec 3, 2021Engine & cooling

The contact owns a 2015 Chevrolet sonic. The contact stated that while driving at approximately 25 MPH, there was white smoke coming from under the hood of the vehicle. The contact mentioned that once the vehicle was to the side of the road, the contact noticed that there was antifreeze all over the engine. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the rear water outlet needed to be replaced. The vehicle was repaired however, the failure recurred twice. The manufacturer was not notified of the failure. The approximate failure mileage was 75,000. The VIN was invalid.

NHTSA ODI 11442568

Working with the data? Download all 114 complaints as CSV · fetched from NHTSA July 19, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2015 Chevrolet Sonic verdict →