There are 2 stored owner reports matching the powertrain & transmission leading-label group for the 2020 Chevrolet Sonic in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 2 of 2 matching reports.
Open the full vehicle complaint log (all categories)1st occurence at approximately 37k miles on Vehicle has issue based on climate temperature sensor triggers a computer code 84 vehicle goes into limp mode to prevent engine failure however, this happens instantly no time to react and more than one occasion creating a hazardous driving situation in heavy traffic, vehicle also overheats creating hazardous leaks of anti freeze at boiling temperatures ability to burn anyone who comes in contact. This remains an ongoing issue with vehicle, vehicle now back in possesion of bank Santander Consumer USA, this is being reported to protect any innocent parties involved to avoid injuries or even fatality
MANUFACTURERS OWNERS MANUAL INSTRUCTIONS MAY LEAD TO TRANSMISSION / ELECTRICAL FAILURES WHICH MAY CAUSE AN ACCIDENT WHEN TRAVELING. THE RECREATIONAL TOWING INSTRUCTIONS REQUIRE THAT FUSES BE REMOVED (STEP 5) BEFORE NEXT STEPS INCLUDING SHIFTING VEHICLE INTO PARK AND TURNING IGNITION TO THE ON POSITION . THOSE STEPS ( 6-9) CAN NOT BE EXECUTED IF STEP 5 IS EXECUTED FIRST. OWNERS WHO ATTEMPT TO PREPARE THE VEHICLE FOR RECREATIONAL TOWING BY USING A DIFFERENT SEQUENCE RUN THE RISK OF DAMAGING THEIR VEHICLES AND/OR CAUSING SEVERE ACCIDENTS IF THE TRANSMISSION LOCKS UP UNDER TOW (MOVING). DEALER CLAIMS IS VIN SPECIFIC. IT IS NOT VIN SPECIFIC. I TESTED SEVERAL IDENTICAL VEHICLES ON THE DEALER LOT AND THEY ALL FAIL, USING THE MANUFACTURER INSTRUCTIONS.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.