2021 Hyundai Sonata Transmission & Power Train Problems
NHTSA component category: POWER TRAIN · data through 09/08/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How power train ranks on this vehicle
Share of the 130 complaints citing each category; one complaint can cite several. Full breakdown on the 2021 Hyundai Sonata overview page.
What owners report
“Vehicle suddenly lost heat in 30 degree weather. No warnings, check engine light, or temperature gauge indicators came on. Lucky made it to a parts…”NHTSA complaint 11718194 — filed 02/16/2026
“I own a 2021 Hyundai Sonata 1.6T, which has an open NHTSA safety recall (25V796000) related to fuel tank pressurization and fire risk. I brought…”NHTSA complaint 11707864 — filed 12/30/2025
“The contact owns a 2021 Hyundai Sonata. The contact stated that while driving at 30 MPH and depressing the accelerator pedal, the vehicle failed to…”NHTSA complaint 11695902 — filed 10/27/2025
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Power Train complaints by year filed
Frequently asked questions
Does the 2021 Hyundai Sonata have transmission & power train problems?
Power Train is the #3 most-reported problem area on the 2021 Hyundai Sonata: 22 of 130 complaints on file (16.9%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2021 Hyundai Sonata have in total?
130 complaints were on file with NHTSA as of 09/08/2026. Across all categories, 7 involved a crash, 0 involved a fire, 12 reported injuries, and none reported deaths.
What does NHTSA's power train category include?
NHTSA groups complaints about the transmission (automatic or manual), driveline, axles, transfer case and related parts under a single component category called POWER TRAIN. This page reports that category as NHTSA defines it.
