2020 Hyundai Sonata: engine and transmission complaints
HIGH COMPLAINT SIGNAL
49%
91 of 185 relevant owner complaints are about the engine, transmission or fuel system
49% of relevant owner complaints filed with NHTSA on the 2020 Hyundai Sonata are about the engine, transmission or fuel system. That is a model-level pattern, not bad luck.
Worse than 63% of the 1,230 model years we track (2010–2023).
Excludes 9 airbag, lighting and seat-belt recall complaints that would otherwise mask the signal (unadjusted: 47%).
The percentage is each model year's drivetrain complaint share. No elevated signal describes the model year, not any one car; a well-kept example of a flagged model can still be the right buy, and any of these still needs an inspection.
What owners reported
AIR BAGS,ENGINE,FUEL/PROPULSION SYSTEM03/16/2026FIRE1 INJURED
It was smoking from the engine, I immediately stopped the vehicle. My safety was put at risk immediately while being in the vehicle when the air bags deployed hitting me in the face and causing my face to swell. The safety of others was put at risk due to others being right next to me and putting others at risk of engi…
POWER TRAIN,ELECTRICAL SYSTEM09/03/2026
I am submitting a safety complaint regarding a recurring, unresolved electrical defect in my 2020 Hyundai Sonata SEL. The vehicle fails to recognize when the ignition is switched off, leaving core vehicle systems active and causing severe parasitic battery drain that leaves the car immobilized. Description of the Pro…
ENGINE09/03/2026
The A/C evaporator core and the core seal needs replacing on 2020 Hyundai Sonata. Car is 6 years old. I already have a confirmed diagnosis with a PPM refrigerant leak tester at the condensate drain line The diagnosis is 100% confirmed. The evaporator is leaking heavily—we pulled 274 PPM at the drain tube and 177 PPM in…
Three of 91 drivetrain complaints. The full report shows more, with quotes about the engine in the car you are looking at first.
Recall campaigns on this model year (4)
ELECTRICAL SYSTEM:SOFTWARE
Hyundai Motor America (Hyundai) is recalling certain 2020 Nexo and Sonata vehicles. The Remote Smart Parking Assist (RSPA) software may fail to prevent vehicle movement …
EQUIPMENT:OTHER:LABELS
Hyundai Motor America (Hyundai) is recalling certain 2020 Sonata vehicles produced between October 22, 2019 and February 13, 2020. The tire pressure label inside the dri…
LATCHES/LOCKS/LINKAGES:TRUNK LID:LATCH
Hyundai Motor America (Hyundai) is recalling certain 2020 Sonata and Sonata Hybrid, and 2019 Genesis G70 vehicles. The trunk latch may become damaged, preventing the ope…
This does not say whether a particular car has an open, unrepaired recall. That depends on the VIN.
Before you buy a 2020 Hyundai Sonata
Ask the seller whether the fuel system has ever been repaired or replaced, and whether the car has shown hard starts, stalling, hesitation, a fuel smell or a check-engine light.
Drive it from a cold start and long enough to warm up. Many fuel system faults hide once the car is warm.
Get an independent pre-purchase inspection from a mechanic you choose, and tell them to focus on the fuel system.
4 recall campaigns on this model year. Whether a specific car still has one open depends on the VIN; the report checks that.
Ask for service records. A fuel system already replaced under warranty is a different car from one that was not.
Have the VIN?Paste it and get the full report for that car. First report free, then a 30-day pass covers a whole car search.
Experimental model-level information. This is not a vehicle inspection, vehicle-history
report, financial advice or purchase recommendation. It describes patterns across a model year, not the condition
of any individual vehicle. Combined across 2 body styles NHTSA files separately.
