Electrical System Problems of Hyundai Santa Fe - part 2

My 2025 Hyundai Santa Fe hybrid has recurring powertrain communication failures starting at only 67 miles and continuing at 5,300 and 6,200 miles. Diagnostic trouble codes include u010100 (lost communication with engine control module) and multiple u100xxx codes related to transmission and can bus communication failures. These indicate loss of communication between critical control modules. The issue has happened multiple times and remains unresolved. I am concerned this could cause drivability problems, warning lights, or sudden loss of power. This appears to be a system-level defect in the vehicle’s communication network.

See all problems of the 2025 Hyundai Santa Fe 🔎.

Horn stopped working due to the same issue other Hyundai horns stopped working.

See all problems of the 2021 Hyundai Santa Fe 🔎.

The contact owns a 2018 Hyundai Santa Fe sport. The contact stated that the headlights suddenly illuminated without the vehicle being turned on, causing the battery to be drained. The contact recharged the battery to start the vehicle. The contact stated that the light switch failed to turn off the high beam headlights; however, the headlights and the indicators were no longer illuminated. The vehicle was towed to the dealer, who stated that the junction block had failed and needed to be replaced; however, the contact was not sure of the cause of the failure and needed to repair the vehicle. The dealer diagnosed the vehicle that an interlock casing, fuse, and relay that had melted, and that the switches were not responding, but could not confirm what caused the failure. The contact learned that the vehicle was previously included in a recall for another junction box that had been repaired. The contact was unable to provide the recall campaign. The vehicle was not repaired. The manufacturer was informed of the failure and opened a case. The failure mileage was approximately 18,000.

See all problems of the 2018 Hyundai Santa Fe 🔎.

Official dealer refusal to perform critical safety recall (VIN: [xxx] ) description: I am reporting a formal refusal by the official Hyundai distributor in the dominican republic (magna motors) to perform critical safety recalls on my us-spec vehicle. Pending recalls: recall #251 (NHTSA 23v651000): abs module fire risk. Campaign #953: ksds software update. The dealer (magna motors) refuses to perform the service, claiming a "lack of tools," and has declined to provide a written explanation for this denial. This is a severe violation of safety regulations regarding life-threatening defects (fire risk). As the vehicle is a us-spec unit, I request NHTSA’s intervention to ensure the manufacturer (Hyundai) compels its local representative to complete these repairs immediately at no cost. Please note: I am using a us mailing address only to complete this form. The vehicle and I are physically located in the dominican republic. The local official distributor, magna motors, is failing to honor these NHTSA safety recalls. " information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2013 Hyundai Santa Fe 🔎.

Supplemental update – ongoing safety concerns and extended loss of use since submitting my initial complaint, my leased Hyundai vehicle (VIN [xxx] ) has now been presented for service for the third time for the same unresolved safety-related issues. The vehicle has been held by the dealership for eight (8) consecutive days during this service visit with no resolution and no clear timeline for return. Safety concerns remain unresolved, including: persistent toxic/chemical odor inside the cabin random rear hatch opening while vehicle is parked and locked repeated false “windows open” alerts electrical/body control system irregularities to date, I have not been provided with documentation confirming that cabin air quality testing, exhaust intrusion testing, or comprehensive electrical diagnostics have been performed. These unresolved conditions present ongoing safety risks and loss of use. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

My car was locked and battery had died. I was able to get in car with key from fob. I had to put car charger on battery in order to start car. This car is a year old with 18,531 miles.

The vehicle has two display panels, molded into a single frame. There is an infotainment panel on the right that handles music, maps, and phone interaction. There is an instrument panel on the left. The infotainment panel has not issues. The instrument panel blanks out for 3 - 5 seconds every few minutes, and then reappears. Occasionally the words "no signal" in big red letters will appear. Occasionally the gear selection letter will remain on the otherwise blank screen. The screen also shudders / tears occasionally before blanking. It does this whether the vehicle is moving or parked. I purchased the vehicle used, Jan 2 2026. I noticed the problem a couple of days later. It has continued. It is not getting any worse or any better.

This is an update to existing NHTSA odi complaint #11735718 2017 Hyundai Santa Fe sport, txxi theta ii engine defect. Update: on may 7, 2026, Hyundai case manager acknowledged in writing "your case is important to us" and "2. 4l theta concerns" for case #42623761. This is written admission the vehicle has the txxi defect covered by warranty extension to 120,000 miles. I gave Hyundai 48 hours to provide written authorization for oil consumption test per their TSB 22-em-003h. After 3 days they are silent. They refuse email communication despite documented language barrier. Current vehicle status: - active dtc p0010 causing loss of power and stalling risk - oil consumption: 1 liter per 600km, which is 3x Hyundai failure threshold in TSB 22-em-003h - 95,772 miles, under txxi 120,000 mile warranty limit - u. S. Spec vehicle covered by txxi warranty extension Hyundai is violating magnuson-moss warranty act by refusing to honor written warranty for known safety defect. The p0010 defect causes sudden loss of power while driving. Requesting immediate NHTSA intervention to compel Hyundai to perform warranty repair.

See all problems of the 2017 Hyundai Santa Fe 🔎.

Vehicle will suddenly shutdown in the middle of the road. This could easily have caused a crash at any time. Several batteries have been replaced due to alternator not charging the battery. Then the battery has to be jumped for emergencies. I have taken the car in for repairs of the recall twice. I was told that the front end would come off and parts would have to be replaced because of the age of my vehicle they would not fit again. I need a solution to this problem.

See all problems of the 2009 Hyundai Santa Fe 🔎.

The contact owns a 2018 Hyundai Santa Fe sport. The contact stated that while driving at 25 mph and approaching a stop, the vehicle stalled. The battery, check engine, and oil warning lights were illuminated. The contact stated that the failure was related to NHTSA campaign number: 22v810000 (service brakes, hydraulic). The vehicle was towed to the local dealer, where an unknown diagnosis was provided. The vehicle was not repaired. The warranty claim was denied. The manufacturer was contacted, but no assistance was provided. The failure mileage was approximately 160,000.

The contact owned a 2017 Hyundai Santa Fe equipped with a rockland electric mobility scooter lifter, part number: 10101194. The contact stated that after the mobility scooter lifter was installed on the vehicle, the vehicle experienced electrical failures. The a/c became inoperable, and the hatch opened intermittently. The contact stated that while the vehicle was parked approximately a month after the lifter installation, the alarm sounded intermittently during the day. The contact observed the vehicle from the residence, but did not notice any abnormality. The contact installed the mobility scooter on the vehicle in the evening. The contact stated that the vehicle alarm sounded at night, and the contact noticed that the vehicle had caught on fire and there were flames coming from underneath the hood by the engine and firewall location. The vehicle was significantly burned from the front end to the trunk. The fire was extinguished by the fire department. A fire department report and a police report were filed. There was no property damage. There was no physical injury sustained. The contact sustained mental trauma, causing headaches and the right side of the lip to quiver. The contact had called gregory fox, an investigative reporter and anchor at wesh 2 news(nbc), who notified the manufacturer of the failure. The manufacturer followed up with the contact and informed the contact that a third-party investigation would be conducted to determine the cause of the fire incident. The vehicle was towed to a salvage yard, where a third-party investigation was conducted, and the manufacturer informed the contact that the fire was caused by the rockland electric mobility scooter lifter. The vehicle was totaled. The failure mileage was approximately 63,000.

Engine control harness with under fuse box due to melted fuse box. This caused my blower motor and relay to go bad. No air flow currently in car due to control harness. Dealership stated that there has been several sante fe that has came in this year with the same issue.

See all problems of the 2022 Hyundai Santa Fe 🔎.

Horn completely out, yes available. I was unable to warn another driver from entering my lane several times. Warn a pedestrian from stepping out into traffic. Confirmed by the dealer. The horn was inspected replaced at my own cost on March 2025 by December 2025 the part is no longer operational. I asked the dealer to honor the warranty they declined saying the mileage was passed the warranty terms.

See all problems of the 2023 Hyundai Santa Fe 🔎.

Started car, reading paperwork and suddenly my car went into neutral bycitself and rolled backwards in a parking lot. Thank goodness no one was walking behind my car. This is the 2nd time it has happened. Additionally, twice previously, my car screen blacked off. 1 other time while sitting at a traffic light, the car shut off. I have been patient but now I'm afraid ti drive this car with only 2,650 miles on it.

-I had just exited from the highway and was driving into my town. While doing so, I had both hands on the steering wheel and suddenly the car started beeping and flashing warnings/ alerts indicating that my hands were not on the steering wheel, which they were. Within seconds the car began to deaccelerate and pull me off the road to my right hand side. I initially had no control over the vehicle. Then again- without explanation it began to register hands on the steering wheel and I was able to resume control of the vehicle. I believe the lane assist feature was on at the time. It all happened very quickly. Had I still been on the highway as I was moments before, there was enough traffic that I would have been pulled into another vehicle or caused an accident if people saw me suddenly rapidly deaccelerating/braking in front of them because they would have no warning and a very tiny amount of time to react. Then, in an other instance that followed shortly thereafter, my boyfriend was driving with one of the lane assist on. While driving, the weather changed and it began snowing and freezing rain that was freezing when it hit the windshield. The lane assist began to have trouble seeing the lines on the road since the snow and ice were obscuring them somewhat. It began to beep and gently correct the car- which was not appropriate in this case (we understand that the road conditions were beyond its abilities to safely discern things accurately). My boyfriend who had two hands on the wheel trying to carefully navigate this sudden burst of weather so at not to slide. He tried turning it off, but it wasn't turning off, and couldn't troubleshoot it without taking his hands off the wheel. He instructed me to turn it off through the settings menu in the infotainment system, which seemed to disable it. Prior to these dangerous problems, I had experienced some seemingly sensor- related malfunctions with the tire pressure monitoring system. I'm out of room to write more.

See all problems of the 2024 Hyundai Santa Fe 🔎.

While driving my 2024 Hyundai Santa Fe, the vehicle experienced a complete dashboard and system blackout, as if the vehicle shut off and rebooted. This has occurred on two separate occasions. On one occasion, while stopped at a traffic light, the dashboard went completely black and restarted. After the system rebooted, the vehicle would not accelerate or move when the accelerator was pressed. I had to turn the vehicle off, restart it, and wait before it would drive again. The suspected malfunction involves the vehicle’s electrical/infotainment and related vehicle control systems. The vehicle is available for inspection upon request. My safety and the safety of others were put at risk because the vehicle lost critical dashboard information and temporarily lost the ability to accelerate while in traffic, creating the risk of being struck by other vehicles. The vehicle was inspected by an authorized Hyundai dealership (world Hyundai of matteson). On December 23, 2025, I was informed by the dealer that a system/infotainment “glitch” had been identified and that a replacement part would be ordered. However, the part was never replaced. The dealer later stated that because the issue could not be duplicated during test drives (approximately 85 miles driven), the repair was not authorized. The dealer acknowledged the issue could not be reproduced on demand. The manufacturer (Hyundai) has not yet physically inspected the vehicle beyond dealership involvement. No police or insurance inspections occurred, as there was no crash. There were no warning lamps or messages prior to the failure. The failure occurred suddenly with a complete dashboard blackout and system restart. The first occurrence happened prior to December 23, 2025; the second occurred afterward. The issue is intermittent and unresolved. I am concerned that the defect must reoccur while driving in order to be repaired, posing an ongoing safety risk.

While driving- in total movement- the car completely shut off. Without any prior warning or indication. Immediately after, the car restarted, drove a couple blocks over, continuing to shut off while driving. It was then towed. How was your safety or the safety of others put at risk? the warning lights did not appear until after the car quit. They all came on & flashed & quickly went back out. Uncertain which component misfired or is affected- possibly related to an engine or fuel/ cylinder failure. Car is at mechanic for inspection. Our safety & lives were in critical jeopardy as the vehicle stopped without warning while driving in traffic congested area. It is unknown if this is a known issue or if this situation has been replicated however the current mechanic facility has experienced the same issue with this vehicle. Also strong odor of gas was experienced during shutoff.

Both horns on my 2023 Hyundai Santa Fe have failed 3 times. The first set was covered under warranty (3/24), the second set cost $499. 64 (3/25). Now both horns are nonfunctional after just being replaced this spring. After reviewing many complaints on the Hyundai community form, it is very obvious there is a major issue with their horns ( and not just the Santa Fe model). Twice this week I was in need of my horn to alert other drivers but instead had to make quick maneuvers to avoid an incident. My vehicle currently cannot pass a state inspection.

While driving after dark, a different car traveling in opposite direction almost caused head on collision while driving in the wrong lane. Driver of the Santa Fe attempted to activate horn on vehicle to alert other vehicle that they were traveling in the wrong lane/direction, but horn failed to sound. Driver was narrowly able to avoid physical collision as a result. Driver took vehicle to dealership and it was determined both high and low horns had failed again (total horn system failure), and the dealership replaced under warranty. This is the second time in less than 2 years of ownership the horns have failed and needed to be replaced. Dealership stated horn failure is common in the 2023 Santa Fe, but is only covered under the 5 year/60000 mile warranty despite being a known defective part. Hyundai should offer a voluntary recall to repair affected vehicles with redesigned parts as the horns failing is a known issue and failure can result in severe safety risk while driving.

I am submitting this complaint to formally report ongoing and unresolved vehicle safety defects involving a leased 2025 Hyundai Santa Fe. These defects include persistent toxic or chemical odors inside the passenger cabin, electrical and body control system malfunctions, and unintended vehicle operations that present serious risks to occupant health, vehicle security, and public safety. Despite multiple service visits and repeated requests, Hyundai dealerships have refused or failed to conduct comprehensive diagnostic testing, leaving the vehicle in an unsafe and unreliable condition.

On a clear road a sencor comes on detect comes on says detection collision. The breaks come on when you are traveling on interstate or two lane roads. When you are traveling 75 mph and breaks come on all of a sudden on the highway. We are lucky we never got hit in the back of the car going that fast. We will stop 75 to 35 mph in 10 seconds.

Horns assemblies are failing repeatedly. Since ownership of the vehicle (2023 and a cpo platinum wrap), I have had to replace a single horn, or both horns three times with local Hyundai dealerships. Mostly the right horn would fail, then the left. I am currently making efforts to have my vehicle’s horns serviced for the fourth time as they are not working. I have been to my dealership on Dec 16, 2025 & Jan 15, 2026, to have the horns repair to no avail. In December, a diagnosis was performed with no action. Yesterday, one part (horn) was not available, and I was quoted a fee of $400 to perform the task. This is extremely concerning as this is not a consumable part or fluid. This is a required vehicle safety item. There are TSB's for other models in the Hyundai line with similar failure of horns ( TSB's: 24-be-018h & 25-be-005h). These failures have not been covered under the Santa Fe line or the other remaining Hyundai models of similar years of production and experiencing like failures of horn assemblies as of this date.

My 2025 Hyundai Santa Fe hybrid with 1724 miles was unresponsive in the garage. Not able to get in the car because the 12v battery was completely drained. Hyundai dispatched a tow truck to take it to the local Hyundai dealership. A service provider did call me to let me know the car was there. He also told me that apparently this problem I had was a known issue with the 2025 Santa Fe hybrids. I had no advance warning of any imminent problems with the battery.

Battery/electrical: 3 separate occasions the battery drained completely overnight, requiring mechanical key to open and jumpstart services from aaa (covered under Hyundai services). Risk of leaving me stranded on isolated areas. Problem confirmed via 3 requests for aaa to jumpstart my vehicle. Hyundai service dept inspected vehicle, confirmed low battery levels, unable to reproduce issues overnight, reported no electrical or mechanical issues that would cause battery drain. No warning messages, lamps, or symptoms prior to each failure. Steering wheel column has friction squeak when using driver assist and adjusting direction. No issues at this time.

There have been several times that I have been driving and either turning onto a 4-lane road (2 lanes going each way) or driving on the parkway, where my car has slammed on the brakes by itself. Not only was I not prepared for this to happen, but neither were the cars behind me. I tend to drive with at least 1. 5 car-length space between myself and the car in front of me. Last week, I was making a right hand turn (going north) into the right lane from a residential street. The only other car near me was the one driving in the left lane (also going north). My car drove about 100 ft and maybe realized that there was a car next to me and just slammed on the brakes. I was suddenly thrown forward. My seat belt locked and I was thrown back into my seat. I had a bruise from my seat belt and came too close to slamming my head on my steering wheel. Thankfully, the car behind wasn't tailgating. About a month ago, I was driving on the parkway going east. I was originally in the right lane. I put on my blinker and when it was clear, I changed lanes to the middle lane. After I was clear and my blinker was off, my car started screaming to tell me that there was a car in my driver's blind spot (this happens every time I switch lanes). I drove for maybe 1. 5 - 2 miles and then suddenly, my car slammed on the brakes. Someone must be watching over me because the escalade behind me (definitely tailgating) was somehow able to swerve into the left lane and then swerve around me to cut me off in revenge. They were screaming and honking at me, while I was screaming and yelling at my car. They could have easily have plowed into me (we were driving at least 60mph) and could have caused a horrible accident that could have killed myself or others around me. I have notified Hyundai of this issue and have read many similar complaints online. Hyundai claims they cannot "replicate the situation" and therefore, Hyundai corp is unable to fix the problem.

Unknown sometimes when I stop the vehicle the engine shuts off and wont come back on until I put the car in park and turn the ignition off. Not safe at all when your in heavy traffic.

See all problems of the 2020 Hyundai Santa Fe 🔎.

At stop sign and car with auto start stop on and at the time of releasing the brake, car was not able to start engine. Car had to be shifted to parking position to start engine.

Horn has failed 4 times.

Component/system: automatic emergency braking / forward collision-avoidance (aeb/fca) system and/or electronic parking brake (epb). The vehicle is available for inspection upon request. What happened: while driving my 2023 Hyundai Santa Fe (VIN: xxx) at highway speeds, the vehicle suddenly and aggressively applied the emergency braking system on two separate occasions within the same day (approximately 45–60 minutes apart). In both instances, the red emergency braking warning lights illuminated on the dashboard, and a warning sound activated. There were no vehicles, obstacles, or hazards in front of me either time. The braking was forceful and abrupt, causing rapid deceleration at highway speed. Both events occurred under normal, clear driving conditions. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6) safety risk: my safety and the safety of other drivers were put at significant risk. Sudden unintended braking at highway speeds can easily lead to a rear-end collision since the deceleration was not caused by driver input and gave no warning. Reproduction / dealer confirmation: the dealer has not been able to reproduce the issue, and no diagnostic trouble codes have been found so far. The vehicle is currently at the dealership for inspection. Inspection: the vehicle has been inspected by the Hyundai dealership, but the cause has not been identified. No manufacturer field engineer, police, or insurance inspection has taken place yet. Warning lamps / prior symptoms: during the failures, the red emergency braking indicator and audible warning activated immediately when the brakes engaged. There were no warning lights or symptoms prior to either event. Assessment: cause unknown. The problem appears to be an intermittent malfunction of the automatic emergency braking system, forward collision sensors, or related braking components. No diagnostic codes were stored. This is a serious safety issue that occurred twice within one hour and could easily result in a collision.

Vehicle experienced a spontaneous interior fire while parked and turned off. No collision, no injuries. Fire originated under the driver-side lower dash/kick panel near the fuse/bcm wiring, then spread into the driver door harness/trim. Exterior body and engine bay show no impact or external origin. Details: heavy charring/melt concentrated at lower dash/junction area with upward/sideways spread along wiring paths; interior plastics, dash switches, and door wiring damaged. Vehicle was unoccupied. Aftermarket: no hardwired accessories in the origin zone. A dashcam was powered via center console usb/12v with a small battery pack (not connected to the under-dash fuse block). Status: towed to [dealer, city/state]; Hyundai corporate case #xxx opened. Insurance comprehensive fire claim opened; origin-and-cause inspection pending. Request: NHTSA investigation into potential electrical/wiring defect in driver lower dash/door-harness area on this model/year; safety risk of parked, unattended fires. Photos/videos available. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The horn stops working which is a safety hazard in case someone is backing into you, etc. This horn has stop working 4 times and had to be replaced.

I was riding on a suburban street and ran over a branch I did not see due to rain and darkness. I went back and looked at the incident and the branch did not seem like it was that big but I quickly lost power and my car stalled and I could not get it restarted. I later found out that that branch took out my hybrid battery connection under the car which rendered the car useless. It is a 5000 fix. I don't know why such an important part is exposed under the undercarriage of an awd SUV. I was traveling at 27 mph. If I had been on a highway it would have been very dangerous to have stalled out so fast. Once it was stalled the battery drained very fast from me running my hazards so that the tow truck driver had to jump it to get it to go from neutral to park and my parking brake is electric so I couldn't activate the parking brake either. I would also like to say that the headlights on this car are severely underpowered.

I’ve had several instances where putting the vehicle into park the system doesn’t register the shifter button being pressed and continues to be in the current gear. Ithis seems to be a safety issue since it has happened multiple times ever since I bought the vehicle. I made sure to fully press the park button but it continues to stay in the drive or reverse gear the first time it happened I did not notice the vehicle did not register the gear change and the car started to roll forward towards a building.

2020 sante fe with 59000 miles on it. Air stops blowing cold, I look it up and there is a TSB for the evaporator temperature sensor from may of 2021. This is a safety issue because if you run the air conditioning or defroster if the sensor is bad it clicks off the compressor which can affect the fan and overheat the car. I watched it happen on my car when they ran the diagnostic trying to fix it. It came up as a bad sensor, and it clicked off the compressor. The fact that a 6 year old car with 59000 miles needs work on an air conditioner is ridiculous and in this case not safe.

While driving on the highway at normal speed, the vehicle suddenly lost power with no prior warning lamps or messages, placing me and other road users at immediate risk. The engine rapidly began knocking, lost acceleration, then stalled completely. I had to coast to the shoulder, which was extremely dangerous in high-speed traffic. The failure appears consistent with bearing wear and debris circulation described in Hyundai recall 168 and TSB 17-01-071, which warn that certain Hyundai 3. 3l engines can suffer internal metallic debris contamination during manufacturing. This can restrict oil flow, damage the bearings, and lead to sudden engine seizure without warning — exactly what happened in this incident. After the failure, the engine was inspected by a Hyundai dealership, but no oil sample, no debris test, and no photo documentation were provided, even though the recall procedure requires these steps when symptoms match knock/no-start failure patterns. The cause was not reproduced or confirmed by any independent mechanical test; the vehicle simply failed suddenly and has remained inoperable since. The incident created a major safety risk because the sudden loss of power happened at highway speed with no safe way to maintain vehicle control or speed. Based on known recall documentation, the symptoms match the described safety-related engine defect. The vehicle remains available for inspection. There were no injuries or police reports, but the situation definitely could have resulted in a crash. In my assessment, this is a critical safety defect related to internal engine debris and bearing failure, consistent with the known Hyundai recall pattern for this engine family.