The 2025 Santa Fe's electrical and control systems are generating serious complaints across multiple failure modes. Owners report the vehicle applying full brakes without driver input at highway speeds, sometimes triggered by lane changes or false perception of nearby vehicles—creating collision hazards for trailing cars. One owner documents a complete brake system failure due to a missing critical clamp component discovered only after the vehicle became unresponsive on the freeway.
Shift system failures are recurring: the vehicle displays Park but continues rolling when the brake is released, or gets stuck in Neutral on startup and won't shift to Drive or Reverse. Dashboard displays black out unexpectedly during operation or while parked, sometimes simultaneously with infotainment system failure. The driver-monitoring camera triggers constant false "take a break" warnings; the forward-collision warning system beeps relentlessly and blocks cruise control; and audio output completely fails on some vehicles with all sounds going silent.
An intermittent electrical fault causes simultaneous failure of turn signals, power locks, windows, and the rear liftgate for 30–40 minutes, sometimes longer. Two owners report 12V battery drain at very low mileage—one at 1,724 miles, confirmed by the dealership as a known issue with 2025 Hybrids. Across all these complaints, dealerships and Hyundai consistently report inability to replicate the problems during inspection, leaving owners with unresolved safety issues.
Failure modes owners describe
Unintended Emergency Braking
Vehicle applies full brakes without driver input, sometimes triggered by lane changes, vehicle presence detection, or blind-spot warnings. Occurs at highway speeds with no warning. Creates collision risk for following vehicles.
When: Various speeds and conditions; narratives #1 reports repeating instances over weeks
Symptoms owners cite: Sudden full brake application at highway speeds; No driver input to activate brakes; Driver and passenger thrown forward; seatbelt locks; Blind-spot warning system activates repeatedly on lane changes; Vehicle appears to misidentify adjacent vehicles as obstacles
Recalls/TSBs owners mention: Hyundai reports inability to replicate the issue in service; no recall mentioned
Complete Brake System Failure—Missing Clamp
Brake system loses all stopping power at freeway speeds due to missing critical clamp component. Manufacturing or dealership assembly defect. No warning lights or symptoms precede the failure.
When: Approximately one month after purchase (new vehicle)
Symptoms owners cite: Brakes do not respond when pedal is pressed; Vehicle will not stop during freeway driving; No warning lights, messages, or prior symptoms
Repairs/costs cited: Hanlees Auto Mall Hyundai in Richmond, CA identified and photographed missing clamp; repair performed. Dealership stated they cannot guarantee failure will not recur.
Recalls/TSBs owners mention: Repair completed at dealership; Hyundai of Vacaville supervisor offered loaner but did not follow through. No broader investigation mentioned.
Intermittent Electrical/Body Control Malfunction
Multiple vehicle systems fail simultaneously for 30–40 minutes: turn signals, power locks, windows, rear liftgate, and driver-assistance systems. Warning lights appear on dash but no stored diagnostic codes found during inspection.
When: April 27, 2026; issue occurred more than once
Symptoms owners cite: Orange warning lights and master warning triangle on dash; Front turn signal rapid flashing; Power locks unresponsive; Power windows do not operate; Rear liftgate will not open via fob or button; Issue resolves spontaneously after 30–40 minutes; does not clear immediately after vehicle shutdown
Repairs/costs cited: Dealer inspected with Hyundai Techline support; unable to reproduce or find active codes. Owner provided video evidence.
Recalls/TSBs owners mention: No repair possible; issue could not be reproduced during inspection
Shift-to-Park Not Registered; Vehicle Continues in Drive/Reverse
Shift lever button press to Park does not register; vehicle display shows 'P' but systems treat vehicle as in Drive or Reverse. Brake release allows vehicle to roll forward. System generates conflicting messages ('Auto Stop is Off. Shift to P or N' followed by 'Gear already selected').
When: First occurrence just before 5,000 miles; happened at least 5 more times after initial occurrence
Symptoms owners cite: Dashboard displays 'P' for Park; Continuous beeping and repeated dash message: 'Auto Stop is Off. Shift to P or N and start engine manually'; Pressing Park button triggers 'Gear already selected' message; Vehicle rolls forward when brake is released despite 'P' displayed; Issue occurs repeatedly and intermittently
Repairs/costs cited: Vehicle documented on owner's video (3 separate recordings); inspected multiple times by Hyundai dealership without repair
Recalls/TSBs owners mention: Hyundai dealership reports inability to replicate issue each inspection
Driver Monitoring System Oversensitivity—Constant False Alerts
Driver Monitoring Camera/Sensor system triggers 'Consider Taking a Break' warning chime and red warning light when driver turns head or glances away from straight-ahead view. Cannot be disabled. Occurs almost constantly and is distracting.
When: Early in vehicle operation; approximately 700 miles
Recalls/TSBs owners mention: Dealer advised system cannot be deactivated. No manufacturer contact attempted.
Stuck in Neutral on Startup; Unable to Shift to Drive or Reverse
Vehicle starts but remains locked in Neutral. Shift selector responds only between Park and Neutral; Drive and Reverse are unavailable. Vehicle will not shut off normally (pressing stop button only resets screen). Occurs on more than 10 occasions and is increasing in frequency.
When: More than 10 occurrences; happening with increasing frequency
Symptoms owners cite: Vehicle trapped in Neutral after startup; Cannot shift to Drive or Reverse; Can only toggle between Park and Neutral; Vehicle will not shut off using stop button; screen resets instead; Condition lasts 10 minutes or longer; Hard reset of infotainment screen sometimes resolves condition
Repairs/costs cited: Dealership performed software update after 8-day service visit when vehicle was nearly new; issue persists and worsens
Recalls/TSBs owners mention: Software update attempted; no root cause identified or fixed
Instrument Panel Blanking—Loss of Display
Instrument cluster display blanks out for 3–5 seconds every few minutes. Occasionally shows 'No Signal' in large red letters or retains only gear-selection letter. Screen shudders or 'tears' before blanking. Occurs whether vehicle is moving or parked. Continuous, non-progressive issue.
When: Observed within days of purchase (used vehicle, purchased Jan 2, 2026); persists unchanged
Symptoms owners cite: Instrument panel (left display in dual-panel setup) blanks for 3–5 seconds every few minutes; 'No Signal' appears in large red letters; Gear-selection letter remains visible on otherwise blank screen; Screen shudders or visual 'tearing' before blanking; Occurs while parked and while driving; Not progressive; stable since purchase
Repairs/costs cited: Not yet serviced; purchase was used (Jan 2, 2026)
Forward-Collision Warning System Malfunction—Constant False Alerts
Forward-collision/attention-warning system triggers continuously, blocking cruise control function and generating excessive beeping that owner states could cause an accident. Persists after dealer attempted fixes (removal of EZ-Tag, which owner states was not the cause). This is documented as a known issue.
When: Since purchase; occurring across multiple service visits
Symptoms owners cite: Forward attention/collision warning beeps constantly; Warning system disables cruise control; Toggling warning on/off results in more warnings; Excessive beeping creates distraction while driving
Repairs/costs cited: Dealer removed EZ-Tag (claimed it was blocking camera); issue persisted. Owner states this is a known issue among owners.
Recalls/TSBs owners mention: Dealer attempted troubleshooting; Hyundai refused to repurchase vehicle
Instrument Panel Blanking While Parked—No Stored Codes
Instrument panel blinks on and off multiple times, then goes dark while vehicle is parked and occupied. Infotainment system also displays blank screen. No failure codes found during dealer inspection despite observable failure.
When: Approximately 6,000 miles
Symptoms owners cite: Instrument panel blinks on and off; Instrument panel goes completely dark; Infotainment display blanks simultaneously; Occurs while parked with occupant in vehicle
Repairs/costs cited: Vehicle taken to dealer for recall repair; dealer found no failure
Recalls/TSBs owners mention: Dealer inspection found no failure despite observed symptoms; no repair performed
Shift-to-Park Register Failure—Vehicle Continues Rolling
Park button press is not registered by vehicle shift system. Vehicle remains in Drive or Reverse despite Park button being fully pressed. Vehicle rolls forward when operator releases brake, creating collision risk.
When: Multiple instances since purchase
Symptoms owners cite: Park button fully pressed but not registered; Vehicle remains in current gear (Drive or Reverse); Vehicle rolls forward when brake is released; Operator must hold brake to prevent rolling
Repairs/costs cited: First incident nearly resulted in collision with building
12-Volt Battery Drain—Unresponsive Vehicle
2025 Santa Fe Hybrid with only 1,724 miles becomes completely unresponsive in garage due to completely drained 12V battery. No warning or symptom precedes failure. Dealership service provider confirms this is a known issue with 2025 Santa Fe Hybrids.
When: Early in vehicle life; 1,724 miles
Symptoms owners cite: Vehicle completely unresponsive in garage; 12V battery completely drained; No advance warning of battery condition
Repairs/costs cited: Vehicle towed to dealership
Recalls/TSBs owners mention: Hyundai dispatched tow truck; service provider confirmed known issue with 2025 Hybrids but did not provide repair details
Complete Audio System Failure—All Sounds Silent
All audio output ceases simultaneously: turn signal audio, collision warning tones, GPS voice, radio, and hands-free phone audio all become completely silent. No warning systems produce sound.
When: Occurrence time not specified
Symptoms owners cite: No turn signal audio; No collision warning sound; No GPS audio; No radio sound; No hands-free phone volume; All warning systems silent
Recalls/TSBs owners mention: Hyundai Service department stated they have never heard of this type of incident
Dashboard Blackout on Startup and While Driving
Dashboard display goes completely black immediately on startup or when vehicle begins moving. Audio remains functional. Display flickers while driving before going black. Safety issue due to loss of critical information display.
When: On startup and during initial driving
Symptoms owners cite: Dashboard goes black on startup; Dashboard goes black when vehicle begins rolling; Screen remains black while driving; Display flickers before blackout; Audio continues to work
12-Volt Battery Discharge at Low Mileage
Vehicle with only 18,531 miles and one year old experiences complete 12V battery discharge while locked in garage. Battery required external charger to restart vehicle. No warning or prior symptoms.
When: At 18,531 miles, one year into ownership
Symptoms owners cite: 12V battery completely discharged; Vehicle would not start without external charger; No prior warning symptoms
Repairs/costs cited: Required external charger to restore vehicle operation
Synthesized from 16 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.