The 2015 Genesis electrical complaints cluster around several distinct systems. Multifunction switch failures (headlight and wiper auto functions) are widespread, often intermittent, and owners cite TSB 20-BE-009H-1 as addressing only the headlight portion despite the integrated assembly. Starter solenoid water contamination under recall 24V-107 is tied to failure cascades—failed starts, battery drain, alternator failures, and one owner's account of a subsequent radiator hose burst after recall service. Owners report ECU and TCM faults causing check-engine lights, limp mode, transmission reversal failures, and unrecoverable stalls on freeways; some cite lack of diagnostic codes despite symptoms. Rear lighting and backup camera failure correlates with trunk wiring harness damage; a TSB exists for this design flaw. Headlight auto-dimming malfunctions leave drivers in darkness on rural roads when oncoming traffic is detected miles away or on opposite sides of medians. Turn signal and DRL bulb sockets burn out prematurely—a dual-filament design flaw—with some owners replacing bulbs multiple times yearly. Miscellaneous electrical gremlins include power trunk hatch malfunctions, door lock failures, key-fob dead batteries, adaptive cruise control and parking sensor failures, and random dash blackouts paired with engine shut-offs while driving. Water intrusion near the battery is noted in at least one failure linked to the starter recall. Many complaints reference inability to replicate failures at dealerships or long delays awaiting recall parts.
Failure modes owners describe
Multifunction switch intermittent failure
Headlight auto and wiper auto features fail intermittently. Integrated assembly sold as single unit (P/N 93400-3M031) but TSB 20-BE-009H-1 mandates partial repair leaving wiper switch in place despite failure.
When: Intermittent, noted at various mileages including 73,481 miles
Symptoms owners cite: Headlights fail to engage in auto mode; Wipers fail to engage in auto mode; Features engage and disengage unpredictably
Repairs/costs cited: Part P/N 93400-3M031 replacement; TSB 20-BE-009H-1 prescribed. Owners report Hyundai denies full assembly replacement under extended warranty, covering only headlight portion.
Recalls/TSBs owners mention: TSB 20-BE-009H-1 (superseded original TSB); class action settlement claims 15-year unlimited-mileage warranty on multifunction switch assembly, but enforcement disputed.
Starter solenoid water contamination and cascade failure
Starter solenoid water ingress causes start failure and battery drain. Repair cascades into alternator and battery replacement; subsequent start failures recur within hours of repair. Recall 24V-107 is active; parts distribution delays reported.
When: Reported at 60,000 to 105,772 miles; failures persistent post-recall repair within 62 miles to 4 hours of operation
Symptoms owners cite: Vehicle fails to start or starts intermittently with clicking sound; Check engine light and battery warning lights illuminate; Vehicle enters emergency/limp mode and shuts down while driving; Complete electrical loss mid-drive; Burning odor from engine compartment
Repairs/costs cited: Starter replacement, battery replacement, alternator replacement cited; one owner paid $1,567 for alternator and battery; repairs fail to resolve starting issues.
Recalls/TSBs owners mention: NHTSA Recall 24V-107 (Electrical System); parts not available despite recall issuance; dealership reimbursement for towing and diagnostics delayed; Hyundai corporate engaged but unable to expedite parts.
Headlight auto-dimming malfunction
Automatic high-beam dimming disengages inappropriately when sensing oncoming traffic miles away or on opposite side of median, leaving driver in darkness on dark roads.
When: Reported during nighttime highway driving
Symptoms owners cite: High-beam disengages prematurely when detecting distant vehicle headlights or taillights; High-beam disengages when detecting traffic on opposite side of road separated by median; Driver left in darkness on unlit highways; Low-beam illumination insufficient for safe driving
Repairs/costs cited: None cited; owner states 2016 model year has proper low-beam illumination addressing this flaw.
Turn signal and DRL bulb socket burnout
Front turn signal and daytime running light bulbs burn out prematurely due to improper filament design. Bulbs and sockets overheat; wiring harnesses show overheating. Widespread online forum complaints.
When: Ongoing since purchase (2015); reported replacing bulbs 2–6 times annually per side
Symptoms owners cite: Turn signal bulbs burn out 2–3 times per year per side; Daytime running light bulbs fail prematurely; Socket internals burn out inside headlight assembly; Wiring harnesses show overheating signs; Entire headlights shut off on two occasions
Repairs/costs cited: Bulb replacement, harness replacement, headlight assembly replacement all attempted without lasting resolution. Owner reports $200–$300 in annual maintenance costs.
Recalls/TSBs owners mention: Campaign issued for lamp housing replacement; warranty coverage expired; manufacturer aware but no recall issued despite widespread forum complaints.
Rear trunk wiring harness damage
Trunk wiring harness fails due to normal trunk operation, causing intermittent loss of rear lighting, backup camera, and license plate lighting. Design flaw creates safety hazard during backing.
When: Intermittent, worsening over time; one near-miss with pedestrian at night
Symptoms owners cite: Reverse lights flicker or fail intermittently; Tail lights flicker or fail; Backup camera intermittently fails or goes dark; License plate light fails; Failures worsen when trunk opened or moved
Repairs/costs cited: Wiring harness replacement needed; one owner nearly struck pedestrian due to backup camera and reverse light failure.
Recalls/TSBs owners mention: TSB issued for 2015–2016 Genesis vehicles describing trunk wiring harness damage and loss of rear lighting/backup camera function.
ECU and TCM failure with limp mode and shutdown
Electronic control unit or transmission control module failure causes check-engine lights, limp mode, unexpected acceleration limits, gear-shifting failures, or complete shutdown while driving. Immobilizer engagement causes stalling in traffic. Some failures without diagnostic codes.
When: Reported at 5,888 miles to 154,000 miles; one case recurring within months of TCM replacement
Symptoms owners cite: Check engine light illuminated with vehicle unable to exceed 20 MPH; Vehicle shakes or jerks unpredictably; Complete shutdown at traffic lights or while highway driving; Loss of motive power without warning; Transmission stuck in limp mode; Reverse gear sends car forward (safety hazard); Immobilizer engagement causing engine bog-out in traffic; Engine overheating warning and shutdown despite no prior indication
Codes mentioned: P0880 (Power Input to TCM), P2106, P0638, P2110 (throttle body related), Unspecified codes cleared without resolution
Repairs/costs cited: TCM replacement attempted without resolving P0880; throttle body and foot control throttle replacement attempted without resolving symptoms; alternator and battery replacements; one owner quoted $4,000 for ECU replacement.
Recalls/TSBs owners mention: Hyundai aware of gear-shift recall but owner claims dealer and corporate failed to mention it until owner discovered independently. Corporate office did not assist.
Headlight flickering and auto-mode glitches
Headlights flicker on and off independently while in auto mode, or turn off completely during driving. Instrument panel shows erratic switching between auto mode and off.
When: Intermittent; reported while driving at night and while stationary
Symptoms owners cite: Headlights flicker or cut out while in auto mode; Dash shows erratic auto/off mode switching; Entire headlights turn off at night on freeway; Lights cut out for several seconds on remote roads; Air bag warning light also illuminates
Repairs/costs cited: Wiring harness replacement attempted; turn signal switch replacement reported by some to fix issue but not official recall. One dealer had car 13 weeks total across two visits without replicating or fixing.
Recalls/TSBs owners mention: Engineer inspection promised but not delivered; some owners cite wiring harness as root cause per dealer diagnosis.
Electrical system-wide cascade failure (multiple concurrent failures)
Simultaneous failures across multiple electrical systems: lighting, locks, warning lights, interior lights, turn signals, rear lights, seat belt chimes, all indicating broader electrical harness or power distribution fault.
When: Occurred after refueling; one case after vehicle restart cycles; one case while driving at various speeds
Symptoms owners cite: Headlights auto-on feature fails while manual on works; Rear lights fail under braking; Turn signals fail (front only, audible sound); Doors fail to lock or unlock; Seat belt warning constant and chime audible for extended period; Interior dash lights at full brightness, unable to dim; Factory GPS locked in 'Preparing' mode; Battery warning light, service key light, temperature control warning light illuminate; Abnormal odor emanates from engine compartment; Vehicle seizes mid-drive
Repairs/costs cited: Dealership unable to replicate or diagnose in one case after 10+ visits; vehicle not repaired.
Recalls/TSBs owners mention: NHTSA Campaign 16V575000 mentioned as possible solution but VIN not included in recall eligibility confirmation.
Power trunk malfunction
Trunk opens partially, fully, or spontaneously without button activation; does not close without manual interior button; trunk operates while vehicle moving or powered off.
When: Progressive worsening from initial onset
Symptoms owners cite: Trunk opens unexpectedly while driving; Trunk opens or closes without button activation; Trunk partially opens and does not fully close automatically
Repairs/costs cited: Owner disabled trunk functions via valet lockout feature pending dealership inspection.
Starter motor failure (post-solenoid repair)
Starter motor fails after initial solenoid water contamination repair, requiring subsequent replacement within short interval.
When: Reported at 100,000 miles; failure occurred after solenoid repair
Symptoms owners cite: Vehicle stalls while driving with check engine light; Loss of motive power; Clicking sound on start attempts
Repairs/costs cited: Starter motor replacement needed; vehicle not repaired at time of complaint due to part availability.
Recalls/TSBs owners mention: NHTSA Recall 24V-107 applicable; parts not yet available for repair.
Battery and key fob power management failure
Water intrusion near battery compartment; battery unable to hold charge despite recent replacement; key fob fails to unlock vehicle despite battery replacement; parasitic drain persists despite dual battery and alternator replacements.
When: Reported after purchase and recently; one case after 6-month battery install
Symptoms owners cite: Water pooling near battery compartment; Vehicle fails to start after 6-day park; Key fob unable to unlock doors; Battery and oil warning lights illuminate; Immobilizer engagement; parasitic electrical drain; Complete electrical power loss with no warning lights
Repairs/costs cited: Battery replacement (multiple), key fob battery replacement, electrical system diagnostic inconclusive; one owner replaced alternator twice in two months; no shop could identify root cause of drain.
Recalls/TSBs owners mention: Recall 24V-107 referenced; owner advised system reset and key fob battery replacement by dealer; parts not available for recall repair.
Adaptive cruise control and parking sensor failure
Front and rear parking sensors intermittently fail to detect objects. Adaptive cruise control fails to see traffic ahead, creating near-collision hazards.
When: Intermittent; recurring across multiple trips and conditions
Symptoms owners cite: Parking sensors fail to detect objects; owner bumped cars when neither system detected other vehicle; Adaptive cruise control fails to see traffic in front; Multiple near-collisions requiring emergency braking; Self-retracting mirrors frequently malfunction
Repairs/costs cited: None cited; manual override required for mirrors.
Door lock and access failure
Key fob unable to unlock vehicle; traditional key fails to unlock; system requires reset to restore function.
When: Reported at 4,700 miles
Symptoms owners cite: Key fob fails to unlock doors; Traditional key fails to open lock
Repairs/costs cited: System reset and key fob battery replacement resolved issue at dealership.
Oil pressure warning light false signals
Oil pressure warning light illuminates under various driving conditions despite no actual oil pressure issue. Check engine light concurrent with power and steering loss briefly.
When: Occurred while highway driving at various speeds
Symptoms owners cite: Oil pressure light comes on during slow, fast, stop-and-go, and highway driving; Check engine light and oil light concurrent with brief loss of power and steering; Vehicle feels like it shuts off mid-highway drive then restarts
Window and audio electrical failures
Driver side front window fails to operate; radio and Bluetooth audio stop working; trunk button fails to open trunk.
When: Ongoing; water leak through trunk related
Symptoms owners cite: Driver side window inoperable; Audio system non-functional despite Bluetooth attempt; Power trunk open button non-functional; Manual key-fob trunk opening required
Repairs/costs cited: Water leaking through trunk causing mold and electrical damage.
Synthesized from 96 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.