Owners are reporting widespread electrical and safety system failures across 44 complaints on the 2025 Hyundai Tucson. The most frequent issue is the instrument cluster and display blackout—the dashboard, HUD, and infotainment screen shut off intermittently while driving, leaving drivers unable to see speed, fuel level, or warning lights. This happens at any speed, sometimes repeatedly within short trips, and often within the first few thousand miles. Dealers acknowledge the problem is known but repairs don't stick; owners bring cars back three, four, or more times as failures recur days or weeks later.
Beyond the display failures, owners report collision-avoidance systems that slam on the brakes without warning or hazard, parking sensors that fail to detect vehicles, and a driver-attention system that falsely detects drowsiness and disables cruise control. Some vehicles lose all electrical power while driving—the entire system reboots mid-road. Heating systems underheat footwells in winter, the fuel gauge underreads by 50% in cold weather, and center consoles get hot enough to damage phones. One vehicle's horn never worked. Dealerships often cannot diagnose these issues or say they cannot replicate them; Hyundai corporate has opened multiple case numbers but offers no permanent fix. The pattern suggests a systemic electrical or wiring harness problem that Hyundai has not resolved.
Failure modes owners describe
Instrument Cluster and Display Blackout
Instrument cluster, infotainment screen, HUD, and dashboard displays go black or blank intermittently while driving. Loss of speedometer, fuel gauge, warning lights, and vehicle information creates immediate safety risk.
When: Ranges from under 400 miles to 13,000 miles; occurs at various speeds including highway; some owners report daily or multiple incidents
Symptoms owners cite: Complete blackout of instrument cluster lasting seconds to 20+ minutes; Dashboard display goes black then reappears with all warning lights illuminated; 'NO SIGNAL' message displays on screen; HUD fails simultaneously with cluster; Infotainment screen shuts off while cluster remains operational or vice versa; Loss of speedometer visibility; All warning lights illuminate when system recovers
Codes mentioned: Unknown error codes reported by some owners, No codes available for many incidents; dealers unable to replicate
Repairs/costs cited: Dealers diagnosed loose coaxial cables, HUD harness replacement needed, instrument cluster wiring harness replacement, rear-view camera display failure. Many vehicles returned to dealer multiple times (3-4+ visits); repairs attempted but failures recur within days to weeks.
Recalls/TSBs owners mention: Hyundai corporate involved with multiple case numbers opened; Hyundai states issue is 'known problem' for Limited trims but no permanent fix offered; some owners report dealership acknowledgment that other owners have same issue
Total Electrical System Failure and Loss of All Lighting
Complete simultaneous failure of interior and exterior lighting systems including instrument cluster, infotainment, HUD, and all illuminated controls. Engine continues running but driver loses visibility and critical information.
When: Reported at night (5:48 pm winter conditions); one incident lasted approximately 2 seconds with recurrence 10 seconds later
Symptoms owners cite: Total blackout of all interior lighting, exterior lighting, digital displays, and illuminated button backlighting; Loss of forward visibility; Loss of critical driving information; System reboots and recovers after 2 seconds; Engine continues running throughout failure
Repairs/costs cited: Dealer was unable to determine cause; vehicle presented 8/7/2025 for diagnosis without corrective action taken
Collision Avoidance System and Safety Feature Malfunctions
Automatic emergency braking activates without cause, collision warning systems fail to detect actual hazards, and safety alert systems generate false warnings. Systems either fail to operate when needed or activate erroneously.
When: Incidents at 20 mph, 35 mph, 40 mph, during normal driving conditions, reversing in parking lots, highway stop-and-go traffic
Symptoms owners cite: Vehicle automatically slams on brakes at full stop without any danger or vehicles near (causes neck pain and whiplash); Wheels lock up and skid to complete stop without warning or brake application by driver; Parking Collision Warning system fails to detect moving vehicle while reversing; Blind spot detection fails to pick up vehicles on right side; Front collision warning affected by angle of sun at certain times of day; False radar warnings activate with no nearby vehicles present; Lane assist warning system malfunctions; Emergency brake activates abruptly without reason or collision risk
Repairs/costs cited: Dealer unable to find issues with braking system; could not reproduce braking failures. Dealer's only suggested 'fix' is to disable entire safety system.
Recalls/TSBs owners mention: Hyundai claims systems are working 'as designed'; no recalls or TSBs identified in narratives
Driver Attention Warning System (FAWS) Malfunction
Forward Assistance Warning System (FAWS) incorrectly identifies normal driving conditions as drowsy/distracted driving and disables Adaptive Cruise Control. System's off-switch does not function as intended.
When: Continuous occurrence during normal operation
Symptoms owners cite: FAWS incorrectly alerts driver of 'sleepy driver' condition without cause; Adaptive Cruise Control disables due to false FAWS alert; Continuous alerts to 'stay alert' without actual safety concern; Off-switch for FAWS does not disable the system; System triggers multiple times per trip regardless of driver attention
Repairs/costs cited: No repair available; system cannot be disabled despite off-switch
Recalls/TSBs owners mention: Hyundai claims system is working 'as designed' and suggests driver wear specific sunglasses, be shorter than 6'1", or not wear hats
HVAC Heating System Deficiency
HVAC system fails to distribute heat adequately to footwells despite high-temperature output at dashboard vents. Warm-up time excessive. System does not meet safety requirements for cold climates.
When: Winter operation; 1.5-3 hours to reach adequate temperature; consistent issue in Minnesota winter conditions
Symptoms owners cite: Large temperature differential between dashboard vents (115-143°F) and footwells (65-85°F); Insufficient heat reaching footwells despite maximum HVAC settings; Extended warm-up period (1.5-3 hours) from startup to adequate temperature; Feet remain cold despite dashboard vents being hot
Repairs/costs cited: No repair offered; dealership stated condition is 'working as designed'
Recalls/TSBs owners mention: Hyundai dealerships refuse to repair without error code; corporate unwilling to admit fault; state issue is not software-related but air exchange design problem
Fuel Gauge Inaccuracy
Fuel gauge consistently underestimates remaining fuel available, particularly in cold weather, creating risk of running out of fuel in remote areas.
When: Cold weather conditions; 50% underestimation reported
Symptoms owners cite: Fuel gauge shows significantly less fuel than actually available; 50% underestimation in cold weather conditions; Inconsistent and unreliable fuel level readings
Recalls/TSBs owners mention: Hyundai dealership acknowledges similar issue with EON model; without error code Hyundai unwilling to repair; corporate case opened but no resolution
Excessive Center Console Heat
Center console area becomes excessively hot during winter HVAC operation, exceeding 130°F. Heat damages consumer electronics and presents burn risk. Heat appears to originate from HVAC ducting routed through console.
When: Winter operation with heater in use; most severe after warm-soak cycle
Symptoms owners cite: Center console surface temperatures exceed 130°F; Wireless phone charging pad becomes dangerously hot; Phones placed in console storage trigger thermal protection warnings and overheat; Cup holders become hot enough to present burn risk; Heat persists even when rear vents are closed; Condition repeats with warm-soak driving cycles
Repairs/costs cited: No repair offered; dealership stated condition is 'normal'
Recalls/TSBs owners mention: Hyundai service department states heat is 'normal'; no temperature measurements provided in writing; Hyundai Consumer Affairs redirected owner to same unresponsive service department
Horn Inoperability
Horn fails to operate when needed for safety warning. Owner attempted to alert reversing driver but horn was non-functional.
When: Approximately 8,400 miles
Symptoms owners cite: Horn does not operate when activated; No warning lights illuminated to indicate malfunction
Repairs/costs cited: Necessary parts on backorder; vehicle not repaired
Loss of Power and System Reboots While Driving
Vehicle loses power to multiple systems including instrument cluster, infotainment, charging ports, and speakers while driving. Engine continues running but critical systems go offline. Happens randomly and unpredictably.
When: Intermittent occurrences during normal operation
Symptoms owners cite: Sudden complete electrical failure with instrument cluster and infotainment shutting off; Speakers go dead; All charging ports lose power; HUD fails during same event; Air conditioning system loses power and restarts while driving; System operates normally after vehicle restart but fails randomly again; Complete vehicle shutdown while driving (unable to restart immediately)
Repairs/costs cited: Dealership has vehicle for over one month with no resolution
Recalls/TSBs owners mention: Hyundai corporate involved with multiple case numbers; dealership and manufacturer lack transparency regarding repair plan and completion date
Dashboard Warning Lights Malfunction
All major warning lights illuminate simultaneously without cause and remain on even after vehicle shutdown. This includes ABS, Power Steering, Traction Control, Stability Control, AFS, EPB, and Battery warnings.
When: Intermittent occurrences; some instances involve rapid flashing on infotainment screen
Symptoms owners cite: Every major dash warning light illuminates at once: ABS, Power Steering, Traction Control, Stability Control, AFS, EPB, Battery; Lights stay on even after shutting off vehicle; Battery fully drained and lights remain on; Various warning lights flash rapidly on infotainment screen without corresponding vehicle conditions; Check User Authentication error message displays; Check driver assistance warnings appear repeatedly
Codes mentioned: Check User Authentication error, Check driver assistance warning
Repairs/costs cited: Dealership first diagnosed loose coax cables from factory as cause; problem continues after repair; instrument cluster wiring harness replacement planned but not yet completed
Recalls/TSBs owners mention: Hyundai corporate involved with multiple case numbers; no permanent fix found
Synthesized from 47 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.