2020 Hyundai Santa FE Problems

What owners report

Owners of the 2020 Santa Fe report two broad themes: engine-related trouble (oil consumption, stalls, loss of power, and in some cases engine replacement) and a set of electronic/electrical quirks such as dead batteries, no-start conditions, and horn failures very early in ownership. A notable cluster of complaints describes the panoramic sunroof shattering, and transmission and automatic emergency braking complaints rise at higher mileage, many above 40,000 miles.

1. 1
   Engine

   Engine oil consumption, stalling and engine replacement

   • 69 complaints (32%)
   • median 72,700 mi at 6.0 yrs old (11 state mileage)
   • 3 mention a crash, fire or injury
   • owner-quoted repair $540 (median of 5 quotes)
   • filed 2020–2026

   Complaints describe low oil on the dipstick between oil changes, oil lights flickering or coming on, and in some cases a seized engine requiring replacement. Several owners report stalling or limp mode with the check engine light on, and dealers variously add oil, diagnose a knock sensor, or replace the engine; some owners say the dealer could not duplicate the problem. Some complaints link the condition to an emissions-related ECM service campaign performed on the vehicle. Reported from as little as a few thousand miles up to roughly 137,000 miles, often after an ECM/emissions software update was installed.

   19 related service bulletins

   What to check: Check oil level and look for a fuel smell or unusual consumption between services, review oil-change receipts, and ask whether the emissions-related ECM update was applied and what the engine's service history has been.

   2 excerpts from owner complaints in NHTSA records

   “My car is consuming an immense amount of oil, the manufacturer recommends oil changes every 7,500 miles, I get an oil change less than 3,000 miles and on my last oil change i was told that there are oil shavings in my oil filter. I just got the SC9C2 update and now my engine is knocking. Car drives super rough and has signs of rod bearing failure. My engine is the Theta II 2.4GDI, a class action lawsuit was filed against Hyundai but my car wasn't included. …”

   NHTSA complaint #11760974, filed 2026-08

   “I was driving out of the parking garage at work and happened to catch the oil light flicker on and then go off. I immediately drove it to an auto shop where I told them what happened. They looked at the dipstick and there was no oil showing on the dipstick. If I had just written the light off as an oddity I would have driven the car home from work (around 20 miles) and the engine could have stalled at 60mph creating a safety hazard. I have the oil changed regularly (about every 5,000 miles) and have my receipts. …”

   NHTSA complaint #11733709, filed 2026-04
2. 2
   Electrical system

   Dead battery, no-start and electrical glitches

   • 38 complaints (17%)
   • median 4,909 mi at 1.4 yrs old (14 state mileage)
   • 6 mention a crash, fire or injury
   • filed 2020–2026

   Owners report the vehicle failing to unlock with either key fob or the connected app, then failing to start, with no interior lights or accessory power; dealers have replaced batteries or said the car was not driven enough. Others describe the horn quitting repeatedly (diagnosed as a clockspring issue and replaced), intermittent turn-signal delay in cold weather, and alarm systems that failed to sound during a break-in. Mostly reported under 6,000 miles, sometimes within the first weeks of ownership.

   4 related service bulletins

   What to check: Check that the horn sounds consistently, verify battery age and any records of repeat battery replacements, and ask about the anti-theft software and ignition protector updates.

   2 excerpts from owner complaints in NHTSA records

   “Date: friday, 3 july 2020. My car would not unlock with the key fob. Thought the key fob was dead and grabbed the spare to try again. No luck with that one either. Tried using the blue link app to unlock. Unsuccessful again. Unlocked my car with the key from the fob and got in. None of the interior lights came on (I keep this feature on). That should have been my first clue. Tried starting the vehicle like the owner's manual suggests if the key fob battery is weak. Didn't work. …”

   NHTSA complaint #11337361, filed 2020-07, 840 miles

   “Brake has been sticking last couple of weeks so that I had to pump brake to release to start. This morning I went out to the driveway and could not get into car with either remote or by using blue link on my phone. I used the manual key but could not release any other doors or lift gate. No lights, hazards, radio no nothing. I have had a few dead batteries and never had a car that dead overnight. I drove home from work previous night and I was outside after dark next to my car, no lights left on. …”

   NHTSA complaint #11351707, filed 2020-08, 4,918 miles
3. 3
   Transmission and drivetrain

   Transmission hesitation, lurching and delayed acceleration

   • 55 complaints (25%)
   • median 25,051 mi at 3.2 yrs old (19 state mileage)
   • 9 mention a crash, fire or injury
   • owner-quoted repair $659 (median of 5 quotes)
   • filed 2020–2026

   Complaints describe the transmission hanging in gear, slipping and then jerking forward, delayed or no response from the accelerator when pulling away, and the vehicle lunging forward from a stop. Some owners also report rough shifting and stalling after an ECM or TCM software update, with dealers sometimes unable to duplicate the complaint or finding no fault codes. Reported from about 2,400 miles up to roughly 98,000 miles, often in stop-and-go or from a complete stop.

   2 related service bulletins

   What to check: Test the vehicle from several complete stops in different drive modes and note any lag, lurch or rough shifting, and ask whether any transmission control module updates have been applied.

   2 excerpts from owner complaints in NHTSA records

   “When stopped at a traffic light and the auto engine turn off kicks in as expected with my foot on the brake pedal. However, the behavior is very erratic when I release my foot from the brake. Sometimes the vehicle jumps aggressively without me applying any acceleration and sometimes the engine just starts and the vehicle does not move until I apply some acceleration. I almost rear ended the cars infront of me few times. I got way too skeptical and began turning off the auto turn off feature when I get into my car.”

   NHTSA complaint #11396388, filed 2021-02, 2,400 miles

   “There are three issues: 1.) in sport mode, the transmission will sometimes get stuck/hung in gear (maybe gear 3 or gear4) and will not shift into the next gear, even when increasing speed. 2.) also in sport mode, after driving for about 10 or 15 minutes the transmission will often slip into gear 5, after revving high and can be heard revving, but it is not reflected on the tachometer, and then when the gear catches it is a violet jerk forward. …”

   NHTSA complaint #11403919, filed 2021-03, 2,777 miles
4. 4
   Visibility (wipers, defrost, mirrors)

   Panoramic sunroof glass shattering

   • 16 complaints (7%)
   • median 29,000 mi at 4.2 yrs old (4 state mileage, few)
   • filed 2020–2026

   Owners describe a loud bang while driving, after which the panoramic sunroof glass is found shattered outward, with the break appearing to originate inside the panel. Complaints say nothing struck the glass beforehand, that the vehicle was on a paved road, and that dealers have not always treated it as a warrantable repair, describing it as a common failure tied to body flex. Reported from about 15,000 to 72,000 miles, typically at highway speeds.

   Recall 21V00M000

   What to check: Inspect the sunroof panels closely for chips, repaired cracks or previous replacements, and ask whether any sunroof glass has already been replaced under warranty.

   2 excerpts from owner complaints in NHTSA records

   “I had been driving my vehicle for about 5 minutes when I heard what sounded like a loud bang or gunshot followed by the sound debris falling. I realized the front piece of my panoramic sun roof had literally exploded. When I got out to look at it the glass around the hole was pointed upwards so it looked like it exploded from the inside out. The glass had no prior damage and nothing hit it before the explosion. I was on a paved road by myself.”

   NHTSA complaint #11544448, filed 2023-09

   “Sitting in parked vehicle. Opened the rarely-opened panoramic sunroof. Heard unusual sound,. Looked next day and noticed a stationary glass panel forward of the sunroof had shattered all the way around but had not collapsed (yet--have tape on it to keep it intact until repairs can be made). Hyundai does not consider this to be a warranty issue. …”

   NHTSA complaint #11548273, filed 2023-10
5. 5
   Forward collision avoidance

   Automatic emergency braking activates on its own

   • 16 complaints (7%)
   • median 4,500 mi at 1.4 yrs old (5 state mileage, few)
   • 4 mention a crash, fire or injury
   • filed 2020–2026

   Complaints describe the forward collision system braking in the middle of the road with no vehicle or obstacle nearby, sometimes at highway speeds and causing a momentary loss of control. Other owners report the system failing to detect vehicles or pedestrians, and complaints state dealers found no fault codes or could not reproduce the behavior. Reported from very low mileage (under 1,000 miles) through about 90,000 miles, mostly at highway speeds.

   What to check: Ask the seller to confirm the front sensor and camera area is undamaged and free of debris, and drive at highway speed in light traffic to see whether warnings or unintended braking occur.

   2 excerpts from owner complaints in NHTSA records

   “The 2020 Hyundai Santa Fe foward collision avoidance assistance system is not functioning correctly. We have contacted Hyundai on multiple occasions without response. The system is braking in the middle of the road without and cause. No cars are in any proximity and the car brakes in the middle of the road. This has occurred twice without warning in the last several months. Dealership has no answer when we took the car in. Hyundai consumer line does not return calls. It is an extreme danger with our son driving car. …”

   NHTSA complaint #11399665, filed 2021-03, 4,500 miles

   “The FCA (forward collision avoidance) system does no work as it should. It does not see vehicles or pedestrians directly in front while not in cruise control. The only time the system alarms is when following a vehicle, which is in the same lane on city streets, and then the target vehicle turns right and creates no hazard. The FCA does not work according to what is mentioned in the owners manual, nor does it operate like it is shown in a youtube video sponsored by Hyundai.”

   NHTSA complaint #11298608, filed 2020-01, 50 miles

Buying note. Ask for a full service history, confirm whether the emissions-related ECM update and any anti-theft software were applied, and check the oil level and sunroof condition before buying. A pre-purchase inspection that includes a highway test drive can help surface braking-system, transmission and engine concerns that owners have reported.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.