Certain Santa Fe (TMA), Santa Fe Sport (AN), Sonata (LFA), and Tucson (TL) vehicles equipped with Theta II engines may exhibit elevated engine-out emissions. This bulletin provides instructions for updating the Engine Control Module (ECM) to address this condition.
full bulletin at NHTSA ↗2020 Hyundai Santa Fe electrical problems
severe Owners of the 2020 Hyundai Santa Fe have filed 21 NHTSA complaints about the electrical at roughly $850 to repair (U.S. federal records, as of July 2026). Source: NHTSA Office of Defects Investigation. See electrical across all vehicles →
Complaints
21
Recalls
0
Avg fix
$850
| Model year | electrical complaints |
|---|---|
| 2016 Santa Fe | 9 |
| 2017 Santa Fe | 54 |
| 2018 Santa Fe | 7 |
| 2019 Santa Fe | 18 |
| 2020 Santa Fe (this page) | 21 |
| 2021 Santa Fe | 23 |
| 2022 Santa Fe | 23 |
| 2023 Santa Fe | 28 |
| 2024 Santa Fe | 19 |
1crash
1fire
1injury
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Certain Santa Fe (TMA), Santa Fe Sport (AN), Sonata (LFA), and Tucson (TL) vehicles equipped with Theta II engines may exhibit elevated engine-out emissions. The California Air Resources Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
full bulletin at NHTSA ↗Following completion of Service Campaign 9C2 (Theta II Emissions Improvement), certain vehicles may exhibit a brief hesitation or rough shifting condition during cold start operation. If present, this condition is expected to occur only within approximately the first 1-3 minutes after engine start, while the catalyst is reaching its normal operating temperature.
full bulletin at NHTSA ↗Following completion of Service Campaign 9C2 (Theta II Emissions Improvement), certain vehicles may exhibit a brief hesitation or rough shifting condition during cold start operation. If present, this condition is expected to occur only within approximately the first 1-3 minutes after engine start, while the catalyst is reaching its normal operating temperature.
full bulletin at NHTSA ↗Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink Service functions. This may be due to an irregular disconnection on Verizon’s communication network. Follow the procedure in this TSB to reestablish the connection via the AVN pinhole reset method.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The 2020 Hyundai Santa Fe electrical system failures described in these narratives span multiple subsystems and severity levels. Most widespread are HVAC evaporator temperature sensor failures causing air conditioning to shut down in warm weather, with TSB 21-HV-002H documenting the defect and calling for a $30–$50 sensor replacement, yet dealers quoting $2,500 for full evaporator replacement.
Battery drain remains a persistent problem—some owners experience overnight discharge with no explained parasitic draw despite new batteries and alternators, while dealers dismiss the issue. Multiple owners report cascading electrical failures affecting the rearview camera, dash warning lights, safety systems (ABS, ESC, forward collision warning), and fuel/temperature gauges simultaneously.
More serious are reports of a vehicle rolling backward from park while engine was off, a driver-seat electrical fire that totaled the vehicle, and intermittent engine shutdown at stops. The backup camera malfunctions repeatedly even after dealer repair, and false collision warnings trigger automatic braking on empty roads.
A small number of complaints describe engine performance issues (won't exceed 2,000 rpm, wiring harness code P1326) that recur after factory repairs, and extreme oil consumption with burnt valves. Horn and driver-airbag clockspring failures occur within weeks of replacement. One instrument cluster turns off entirely. No clear recall pattern exists across these failures, though owners note recalls for 2021–2022 models may apply to 2020s.
Same Hyundai Santa Fe electrical reports on nearby years: 2017 · 2019 · 2021 · 2022 · 2023
Failure modes owners describe
Knock sensor / engine performance
Engine codes with check engine light blinking; vehicle won't accelerate past 2,000 rpm and bogs down; knock sensor software upgraded and sensor replaced at dealership; issue recurred after repair.
When: Starting on date [XXX]; recurred multiple times through May 2024
Symptoms owners cite: Check engine light blinking; Won't accelerate past 2,000 rpm; Vehicle bogs down on highway; Engine rattling during acceleration
Codes mentioned: P1326 (wiring harness/engine)
Repairs/costs cited: Knock sensor software upgrade and knock sensor replacement at Webb Hyundai ($100 under extended warranty); additional work at Gerald Hyundai totaling $540 (some covered by extended warranty); issue recurred after both repairs
Electrical system / sensor cascade failure
Multiple simultaneous electrical and safety system failures including disabled ADAS, ABS, ESC, brake warning lights, rearview camera failure, fob key entry failure, and steering system warnings; MPH and tach displays blurred; accessory light on but engine won't start.
When: Over two days; no mileage stated
Symptoms owners cite: Blind spot monitoring lights flickering; Forward Collision Avoidance disabled; ABS blinking red; Electronic Stability Control disabled; Downhill Brake Control disabled; Parking Brake & Brake Fluid blinking red; Rearview camera failed; Lane Keeping Assist shifted to orange; Key fob entry trouble; Auto Hold, Master Warning, Forward Collision lights steady on; MPH and tach blurred; 'Put in P' message while parked; Accessories light on; engine won't start; AWD, Low Tire Pressure, Power Steering warnings; Temp and gas gauges dropped to zero
Recalls/TSBs owners mention: Consumer reported to Hyundai Consumer Affairs; no recall found under VIN despite similar failures widely reported
Parking brake / transmission failure
Vehicle in park mode rolled backward unexpectedly while parked with engine off, striking another vehicle; occupant sustained back injury attempting to stop vehicle; vehicle was on recall list but owner not notified.
When: May 11, 2020, 11:45 am
Symptoms owners cite: Vehicle moved backward from park without ignition engaged; Rolled despite being in park gear
Recalls/TSBs owners mention: Vehicle was on recall list but consumer not notified
Electrical fire
Driver seat caught fire overnight without vehicle running or accessories engaged; fire melted driver seat and lower steering wheel; interior covered in orange dust with toxic smell; insurance declared total loss; Hyundai investigation opened but closed after salvage sale; Hyundai denied knowledge of electrical fire potential despite similar reports.
When: September 26-27, 2024
Symptoms owners cite: Fire in driver seat area; Melted seat foam and steering wheel; Orange dust throughout interior; Toxic smell
Repairs/costs cited: Vehicle declared total loss; no repairs attempted
Recalls/TSBs owners mention: Hyundai opened investigation but closed it after salvage sale; denied recalls for electrical fire or knowledge of issue despite tow hitch recall for fires on other units
Engine temperature / coolant system
Engine overheating alarm and red-zone temperature gauge on third day of ownership with only 252 miles; temperature fluctuated in upper 2/3s of high range; engine rattling with acceleration; heating system blew only cold air despite heat being requested.
When: Third day of ownership (2020 model, purchased new)
Symptoms owners cite: Engine overheating alarm; Temperature gauge in red zone; Temperature fluctuating in upper 2/3s of high range; Engine rattling with acceleration; Heating system blows only cold air
Recalls/TSBs owners mention: Vehicle returned under 3-day grace period; no explanation provided by dealership
Battery drain / electrical short
Battery dead overnight with no known drain; sticking parking brake requiring pumping to release; remote and Blue Link app access failed; key fob inoperative; no interior lights or radio; tow truck operator suspected a short; dealer diagnosed dead battery at 4,918 miles despite recent purchase.
When: 4,918 miles; occurred overnight
Symptoms owners cite: Complete battery discharge overnight; Sticking parking brake; Remote access failure; Blue Link app access failure; Key fob inoperative for all doors and liftgate; No interior lights; No radio or accessories
Repairs/costs cited: Tow truck operator suspected short; dealer replaced battery
Forward / rear collision warning false actuation
Forward collision warning and rear-end collision warning trigger repeatedly on empty roads, parking lots, and highways with no objects, vehicles, or pedestrians present; vehicle brakes automatically; warnings disable during diagnostic; computer shows no codes; dealership unable to resolve after multiple visits and two weeks of service time.
When: Multiple occasions since March 2023 purchase
Symptoms owners cite: Forward collision warning activates unprovoked; Rear-end collision warning activates unprovoked; Vehicle brakes automatically; Warnings disable during diagnostic
Repairs/costs cited: In service at dealership for two weeks with no resolution
Recalls/TSBs owners mention: Hyundai Motors of America told consumer 'nothing they can do' as computer shows no codes or issues
HVAC evaporator temperature sensor
Air conditioning fails to blow cold air; climate control displays -10°F indicating defective evaporator temperature sensor; TSB 21-HV-002H (2021) exists but dealer quoted $2,500 for evaporator/thermostat replacement instead of $30–$50 sensor replacement; vehicle 9 months past 5-year warranty but under 60,000 miles; potential visibility hazard from fogging in humid conditions.
When: 30,000 miles (2020 model)
Symptoms owners cite: Air conditioning fails to blow cold air; Climate display shows -10°F; Potential fogging in humid conditions
Repairs/costs cited: Dealer quoted $2,500 for evaporator/thermostat failure; TSB 21-HV-002H specifies $30–$50 sensor replacement only
Recalls/TSBs owners mention: TSB 21-HV-002H (2021) exists but dealer not following guidance
Battery drain with stalling
Vehicle stalled with all dashboard lights illuminating; took 20 minutes to restart; repeated no-start conditions after multiple battery replacements; dealer refuses to acknowledge parasitic draw; claims customer not starting vehicle frequently enough despite 2–3 starts per week.
When: July 9, 2020 (leased April 24, 2020); repeated in August, October, and December 2020
Symptoms owners cite: Stalling with all dashboard lights on; Delayed restart after 20 minutes; Repeated no-start conditions; Battery drain overnight
Repairs/costs cited: New battery installed in October 2020; new battery installed again in December 2020
Recalls/TSBs owners mention: Dealer refused to acknowledge parasitic draw; blamed customer for insufficient driving frequency
Electrical drain / burned valve
Battery drain despite new alternator and new battery; new alternator and battery installed but vehicle battery died while at shop; extremely high oil consumption with warning light; vehicle shaking and vibration; diagnosed with burnt valve in cylinder one; dealer and Hyundai corporate claim no knowledge of issue despite stating it is common in these vehicles; out of warranty.
When: Unspecified mileage; out of warranty
Symptoms owners cite: Battery drain despite new alternator and battery; Extremely high oil consumption; Oil pressure warning light intermittent; Vehicle shaking and vibration
Repairs/costs cited: New alternator installed; new battery installed; burnt valve in cylinder one diagnosed
Recalls/TSBs owners mention: Hyundai corporate stated no prior knowledge despite acknowledging it is 'common in these vehicles'; repair not covered out of warranty
HVAC compressor / evaporator sensor shutdown
Air conditioning quits after a few minutes when temperature exceeds 80°F; happens repeatedly (at least 6 occurrences); TSB 21-HV-002H exists for evaporator temperature sensor issue; bad sensor causes compressor to click off, affecting fan operation and causing engine overheat risk; dealer unable to find issue; problem resumes immediately after return from service.
When: 59,000 miles (2020 model, 6 years old)
Symptoms owners cite: Air conditioner quits after few minutes above 80°F; Compressor clicks off during operation; Fan affected by sensor malfunction; Potential engine overheat risk
Repairs/costs cited: Sensor diagnosed as bad during diagnostic; compressor shutdown observed during test
Recalls/TSBs owners mention: TSB 21-HV-002H (May 2021) exists for evaporator temperature sensor
Rearview camera / driver assist glitches
Backup camera glitches intermittently; causes driver assist to take unintended control; in service at least 4 times since 2020 purchase with repeated repairs that do not hold; issue worsening with multiple electrical shorts in overhead lights, panoramic roof failure to close, and rear hatch partial opening failures; 2021–2022 Santa Fe recall exists for similar issue; owner believes 2020 model should be included in recall scope.
When: Multiple service visits since 2020 purchase; worsening over time
Symptoms owners cite: Backup camera glitches; Driver assist unintended activation; Overhead light electrical shorts; Panoramic roof failure to close intermittently; Rear hatch partial opening failure
Repairs/costs cited: Repaired at least 4 times; issue returns each time; problems escalating
Recalls/TSBs owners mention: Recall issued for 2021–2022 Santa Fe; 2020 model not included despite similar issues
Alarm system failure
Vehicle alarm system failed to activate during break-in while vehicle unoccupied; police report filed; dealer notified and appointment scheduled for diagnosis but vehicle was never diagnosed or repaired.
When: Approximately 55,000 miles
Symptoms owners cite: Alarm did not activate during break-in
Recalls/TSBs owners mention: Manufacturer notified with case number; no follow-up
Horn / driver airbag clockspring
Horn stopped working intermittently (mostly non-functional) with less than 1,000 miles; diagnosed as driver airbag clockspring internal malfunction and replaced by dealer after one-week service; horn failed again after three weeks on highway driving.
When: Less than 1,000 miles; recurred three weeks after repair
Symptoms owners cite: Horn intermittent, mostly non-functional; Horn fails again after repair
Repairs/costs cited: Driver airbag clockspring replaced
Engine wiring harness / misfire code
Engine light flashing and speed decreasing in heavy rain and traffic on major highway; code P1326 (wiring harness/engine) triggered; vehicle purchased January 17, 2026 with no open recalls per Carfax; sudden failure shortly after purchase.
When: February 20, 2026 (approximately one month after purchase); recently purchased vehicle
Symptoms owners cite: Engine light flashing; Speed decreasing; Loss of power on highway
Codes mentioned: P1326
Recalls/TSBs owners mention: No open recalls listed on Carfax
Rearview camera display glitches
Backup camera displays black lines and flashes off/on intermittently; sometimes shows solid blue screen with no image; problem not replicated during dealer service visit; issue occurring more frequently after outdoor parking; dealer refused to investigate without reproducing the fault.
When: Multiple occurrences; worsening over time; more frequent after outdoor parking
Symptoms owners cite: Black lines on backup camera display; Camera flashes off/on in reverse; Solid blue screen with no image; Increasing frequency of failure
Dashboard warning lights / camera system cascade
Frequent intermittent dash warning lights with no speed or tach indication; cycles through multiple safety system malfunction warnings; disables lane departure, adaptive cruise, cruise control, forward collision, and blind spot warnings; dealership replaced front camera and windshield but issue continues; safety systems randomly disable during highway driving.
When: Recurring at random times while driving
Symptoms owners cite: Frequent intermittent dash warning lights; No speed indication; No tach indication; Lane departure disabled; Adaptive cruise disabled; Cruise control disabled; Forward collision warning disabled; Blind spot warning disabled; Random alarms while driving
Repairs/costs cited: Dealership replaced front camera and windshield; issue not resolved
Air conditioning dropout
Air conditioner quits working after a few minutes when ambient temperature exceeds 80°F; occurs at least 6 times; dealer service unable to identify fault; problem recurs immediately upon vehicle return; no warning light indication; potential heat-stroke risk to occupants.
When: Multiple occasions when temperature over 80°F
Symptoms owners cite: Air conditioning quits after a few minutes; No warning light indication; Recurs immediately after dealer service
Repairs/costs cited: Dealer unable to find fault
Engine stall at stoplight
Engine shuts off when stopping vehicle; won't restart until shift placed in park and ignition turned off; occurs intermittently during heavy traffic; creates safety hazard with potential for traffic backup or collision.
When: Intermittent; during heavy traffic stops
Symptoms owners cite: Engine shuts off at stop; Won't restart until placed in park and ignition cycled
Instrument cluster display failure
Instrument display turns off intermittently.
When: Unspecified
Symptoms owners cite: Instrument display turns off
Synthesized from 21 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The vehicle seat caught fire overnight, Sept 26th, and was discovered the morning of Sept 27th 2024. The fire was contained to inside the vehicle and melted parts of the driver seat and lower part of steering wheel. The vehicle interior was covered in orange dust and had extremely toxic smell inside. Insurance 3rd party inspected and declared it a total loss. A few weeks later, a neighbor and…
Back up camera glitches. Causes driver assist to take control at times when not necessary. Have has this in for service at least 4 times since purchasing vehicle in 2020. Service states repaired each time bit eventually happens again. This last time is getting more severe cause multiple electrical short in Overhead lights, Panoramic roof failure to close at times and rear hatch sometimes only…
Had electrical trouble with your 2020 Hyundai Santa Fe?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2020 Hyundai Santa Fe?
It's a meaningful issue. 21 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Based on the 21 complaints filed, electrical issues most often appear around 20,353 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2020/Hyundai/Santa Fe.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.