The 2016 Sedona's electrical system is a chronic trouble zone. Headlights flicker, go out, or shut down entirely while driving—often when the turn signal is activated, sometimes by themselves—and owners have to jab the controls repeatedly to get them back. This happens on city streets, highways, and parking lots, sometimes starting around 100k miles. Multiple owners found their own fuses and relays were fine, yet dealers offer no fix and cite no recall.
Turn signals are equally unreliable: the left signal triggers the right blinker, both fail to light, or neither works without steering-wheel wiggling or signal-stalk cycling. Rear bulbs blow from the electrical fault. The power sliding doors won't latch properly or lock after closing, make grinding noises, and require manual shoves to shut—a problem since 40k miles that persists even after dealer motor and latch replacements and the factory recall reprogramming.
Cooling fan harnesses melt, causing overheating, and even after parts swaps the fan won't turn on. One owner's AC pigtail connector burned so badly it posed a fire risk. A separate owner's engine compartment caught fire while his wife was picking up children from school. Passenger airbag sensors fail to detect occupants or wrongly flag light adults as children, preventing deployment. Door locks unlock without warning, and one incident involved a water-immersion scenario where side airbags deployed spontaneously while front ones didn't, and open windows inexplicably closed, trapping occupants.
Failure modes owners describe
Headlight dropout and flickering
Low-beam headlights flicker, dim, go out intermittently, or shut off completely while driving—sometimes triggered by turn signal activation, sometimes spontaneous. In auto mode, lights cut out and require manual manipulation of controls to restore. Multiple owners report the issue started around 100k miles.
When: 100,000 miles and above; some reports earlier
Symptoms owners cite: Low beams flicker or go out while driving; Both beams go out simultaneously or one at a time; Headlights extinguish when turn signal is activated, then return; Headlights dim excessively, especially at highway speeds; Parking lights flicker and go out; Lights cut out in auto mode; manual control restores them; Happens on city streets, highways, and while stationary
Repairs/costs cited: Owners report testing fuses and relays themselves with no resolution. No verified repairs documented; dealers have acknowledged multiple customers with same issue but offered no fix.
Turn signal malfunction and crossover
Turn signals fail to engage or activate the opposite side (left signal triggers right blinker, or no signal lights at all). Owners must manipulate steering wheel or signal stalk repeatedly to get signals to work. Bulbs are blown as a result.
When: Throughout vehicle ownership; ongoing for over 2 years per owner reports
Symptoms owners cite: Turn signal does not engage when stalk is pushed; Left turn signal activates right blinker instead; Both turn signals fail to light; Frequent rear light bulb failure; Turn signal works intermittently; hit or miss, especially left side; Turning steering wheel back and forth may restore signal function; Rear light bulbs blown from electrical issue
Repairs/costs cited: One owner had repair attempted at dealership; no cost cited. Other owners report dealers want to charge for diagnostics on a known manufacturing defect.
Power sliding door failure to latch and close
Motorized sliding doors (passenger and/or driver side) do not close fully, do not latch properly in the back, or fail to lock. Doors require manual push to shut completely. Recall 21V725000 was issued to reprogram door sensors, but owners report the remedy failed. Loud grinding or screeching noise during closure.
When: Starting as early as 40,000 miles; issues persist after recalls at 45,000–100,000+ miles
Symptoms owners cite: Power sliding door closes partially but does not latch at rear; Door does not lock after closing; Loud grinding or screeching noise when closing; Door requires manual push to fully close; Door closure button does not work consistently; Interior lights and 'door open' light remain on; Door rattles like change inside when stationary; Door takes multiple attempts to close properly; hit or miss
Repairs/costs cited: Dealers have replaced door motors and latches without fixing the issue. Recall 21V725000 performed (door sensor reprogramming) did not resolve the problem. Owners cite $1000+ repair costs refused under expired warranty.
Recalls/TSBs owners mention: Recall 21V725000 (EXTERIOR LIGHTING, ELECTRICAL SYSTEM) and Recall 18V338000 (STRUCTURE, ELECTRICAL SYSTEM) issued. One owner reported recall remedy for door auto-reverse failed and door crushed upper arm requiring medical attention.
Cooling fan harness melt and fan inoperability
Cooling fan harness negative cable melts, causing engine overheating. After repair, cooling fan does not turn on at low speed. Electrical issue persists despite replacement of cooling fan resistor and pigtail harness.
When: 106,000 miles reported; timing not specified for others
Symptoms owners cite: Engine overheats when cooling fan harness fails; Cooling fan harness melts; Cooling fan does not turn on after repair; Engine smells very hot without overheating warning light; Air conditioner does not work; Electrical connector (female plug) on AC pigtail shorted out and burned
Repairs/costs cited: Kia dealership replaced pigtail cooling fan harness but could not resolve fan operation. Owner replaced new cooling fan resistor and new pigtail harness independently; fan still inoperative. One owner's burned female plug on AC fan pigtail posed fire risk from dash.
Recalls/TSBs owners mention: One owner reports Kia dealership acknowledged it as 'a common problem with Kias.'
Engine compartment fire
Vehicle caught fire in engine compartment while wife was picking up children from school. Engine and electrical system failure triggered fire; vehicle completely engulfed in flames and is total loss at salvage yard.
When: Not specified; prior service for grinding noise and AC issues on March 12, 2024
Symptoms owners cite: Fire originating from engine compartment; Vehicle completely engulfed in flames; Prior intermittent grinding noises; Prior air conditioning malfunction
Repairs/costs cited: Vehicle serviced at Gilman Honda (March 12, 2024) for loud grinding noise and AC issues for $855. Vehicle is at salvage yard and available for inspection.
Recalls/TSBs owners mention: Kia opened a case and expressed interest in inspecting vehicle; no inspection completed at time of report.
Airbag deployment and window anomalies during water immersion
Vehicle went into water after right rear wheel left road. Side airbags deployed, front airbags did not deploy. Windows that were open went up after water immersion. Driver seat moved forward after water entry. Two occupants drowned. Owner suspects airbags deploying too early and window closure impeded egress; questions whether electrical short caused windows to raise rather than stay open.
When: At time of water immersion
Symptoms owners cite: Side airbags deployed upon water entry (no collision impact); Front airbags did not deploy despite collision impact from wheel-off event; Open windows closed (went up) after water immersion; Driver seat moved forward after water entry; Both occupants unable to exit; drowning occurred
Repairs/costs cited: No repair attempted. Police report questioned airbag deployment timing.
Passenger airbag seat sensor malfunction
Passenger seat occupant detection fails. Airbag warning light illuminates, and system fails to detect passenger in seat or falsely indicates light adult as child, preventing airbag deployment.
When: At purchase/early ownership; 300,000 miles reported; intermittent throughout ownership
Symptoms owners cite: Airbag warning light illuminates while driving; Passenger seat sensor fails to detect occupant; Airbag light turns on when passenger under ~175 lbs sits in seat; System indicates passenger is child when adult is seated
Repairs/costs cited: Dealer informed owner diagnostic test was needed; vehicle not repaired. No repair costs cited.
Recalls/TSBs owners mention: Vehicle previously repaired under NHTSA Campaign Number 19V109000 (Electrical System); failure recurred.
Charging system and PCM electrical faults
Charging system failure attributed to alternator, then battery, then PCM (powertrain control module). Owner replaced alternator twice and battery twice; dealer replaced PCM, which functioned briefly then failed again. Underlying electrical fault not resolved.
When: 3 years old vehicle; problem started January; 100,000 miles range
Symptoms owners cite: Charging system failure; Battery discharge issues; PCM malfunction causing charging issues to persist
Repairs/costs cited: Alternator replaced twice, battery replaced twice, PCM replaced once with temporary success then failure resumed; re-order of new PCM pending.
Internal electrical short causing door locks and audio/brake light failures
Internal electrical failure caused rear doors to unlock without warning, brake lights to illuminate spuriously, and radio to short in and out intermittently.
When: Not specified
Symptoms owners cite: Rear doors unlock without warning; Brake lights illuminate unexpectedly; Radio shorts in and out
Repairs/costs cited: Dealer was notified and contact was waiting for diagnostic appointment; vehicle not repaired at time of report.
Recalls/TSBs owners mention: Manufacturer notified; no recall or service advisory cited.
Ignition lock failure and fuel door mechanism malfunction
Key fails to turn in ignition. Rear hatch difficult to open after being unlocked with key fob. Electrical or mechanical lock system failure.
When: Early ownership; 9,960 miles
Symptoms owners cite: Key fails to turn in ignition; Rear hatch difficult to open after key fob unlock
Repairs/costs cited: Vehicle taken to dealer but not diagnosed or repaired.
Recalls/TSBs owners mention: Manufacturer advised owner to take vehicle to dealer; no action completed.
Multimedia/infotainment display failure
Center display stops projecting image, preventing backup camera display in reverse and disabling Bluetooth/phone connectivity for hands-free calling.
When: 44,000 miles; warranty expired at 36,000 miles
Symptoms owners cite: Multimedia display stops projecting; Backup camera not visible in reverse; Cannot control Bluetooth or phone connection; Safety concern due to inability to see behind large vehicle
Repairs/costs cited: Kia diagnosed faulty system; repair not covered under warranty (beyond 36,000-mile limit).
Recalls/TSBs owners mention: Warranty coverage ended; no recall or extended service program offered.
Engine stall and battery post shim failure
Vehicle stalls without warning at low speeds and at traffic lights. Dealer diagnosed battery post shim as cause and replaced it, but failure recurred.
When: 150,000 miles
Symptoms owners cite: Vehicle stalls without warning at low speed; Stalls at traffic light; Stall recurred after repair
Repairs/costs cited: Battery post shim replaced; failure recurred.
Recalls/TSBs owners mention: Manufacturer notified of recurrence.
Hatch lift mechanism failure
Power hatch lift goes all the way up then immediately drops halfway down when rear hatch is opened. Owner has been hit in head multiple times.
When: Not specified
Symptoms owners cite: Hatch lift goes full up then drops immediately; Safety hazard from sudden descent; Owner struck in head multiple times
Repairs/costs cited: No repair documented.
Electronic stability control and ABS light with cooling fan and overheating
Electronic Stability Control and ABS lights illuminate together. Vehicle overheats while idling. Cooling fan does not work despite fuse and relay replacement. Electrical connection appears to be root cause.
When: While in motion at 55 mph initially; overheating during idle
Symptoms owners cite: ESC and ABS warning lights on; Vehicle overheats while sitting still; Cooling fan inoperative; Coolant level drops constantly; Lights flicker on/off three times then stay on
Repairs/costs cited: Fuse and relay for cooling fan replaced without resolving issue; owner suspects electrical connection problem, waiting for professional diagnosis.
Recalls/TSBs owners mention: No recall cited; owner waiting to determine if recall-related.
Synthesized from 44 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.