TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered keys will be erased. Follow the procedures in this bulletin to reset a vehicle Immobilizer or Smart Key system.
full bulletin at NHTSA ↗2008 Toyota Highlander electrical problems
severe 38 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Failure mileage
Complaints
38
Recalls
0
Avg fix
$850
2crashes
5fires
When does it fail?
Of the 38 electrical complaints filed for the 2008 Toyota Highlander, here's the actual mileage breakdown — failures cluster heaviest at 0-25,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Owners have filed 38 electrical complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
No new NHTSA electrical complaint has been filed on this vehicle in over 15 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
TT: Some customers may encounter Bluetooth® connectivity concerns such as: ?Difficulty to pair the phone. ?Intermittent Bluetooth® failure to connect to the vehicle when first turning on the vehicle. ?Various Bluetooth® Audio functions are no longer functioning with customer?s phone such as ability to change the track using the steering wheel controls. These concerns can be caused by changes made on the customer?s phone. Make sure to inquire with the customer if the connectivity concerns occurred after receiving an operating system update on their phone, or if they have restored their phone data/settings recently.
full bulletin at NHTSA ↗TSB: OBSOLETE NOTICE August 11, 2020: This bulletin is no longer applicable and is now obsolete.
full bulletin at NHTSA ↗TSB: OBSOLETE NOTICE August 11, 2020: This bulletin is no longer applicable and is now obsolete.
full bulletin at NHTSA ↗TSB: OBSOLETE NOTICE August 11, 2020: This bulletin is no longer applicable and is now obsolete.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners of 2008 Highlanders describe relentless electrical problems that affect core safety systems and drive costs well into thousands of dollars. The brake actuator assembly and brake booster pump fail frequently, triggering simultaneous warnings (Check ABS, Check Brake System, Check VSC, emergency brake light) and causing loss of braking capability or skid control engagement. Many cite Toyota's Customer Support Program ZKC that covered these repairs for 2008–2010 Hybrids, but the program expired, leaving later owners stranded with $3,400–$4,000 repair bills.
Oxygen sensors fail repeatedly despite replacement, and ABS/VSC wheel speed sensors malfunction intermittently even after Toyota recalibration. Airbag spiral cables short out, disabling airbags, horns, and cruise control—a defect Toyota acknowledged but never fixed, unlike a similar recall of 450,000 Tacomas. Several owners report the intelligent power module failing with symptoms matching an unissued recall for their VINs.
More critically, owners describe erratic door locks that auto-lock children inside vehicles, power window burning smells, seat heaters that ignite causing fires, and complete electrical shutdowns. One vehicle caught fire under the dashboard; another's seat headrest caught fire while parked. Push-button ignition failures left owners stranded repeatedly, and one hybrid system failure caused the vehicle to lurch forward then shut down in traffic with all warning lights flashing. Dealers often cannot diagnose root causes or provide lasting fixes.
Same Toyota Highlander electrical reports on nearby years: 2006 · 2007 · 2009 · 2010 · 2011
Failure modes owners describe
Brake Actuator and ABS System Failures
Internal malfunction of brake actuator assembly and brake booster pump causing multiple warning lights (Check ABS, Check Brake System, Check VSC System, emergency brake and master warning lights). Owners report loss of braking capability, skid control engagement, and clunking noises. Diagnostic code C1391 (Leak in Accumulator) and code POAA6 reported. Toyota's Customer Support Program ZKC covered this issue for 2008-2010 Highlander Hybrids, but the program expired, leaving newer owners without manufacturer support despite the known defect.
When: Typically under 50,000 miles; some cases at 100,000+ miles; one case reported immediately after scheduled maintenance
Symptoms owners cite: Check ABS warning light illuminated; Check Brake System warning light; Check VSC (Vehicle Stability Control) System warning; Emergency brake light falsely illuminated; Red brake system light with buzzer; Yellow slip indicator light; Loss of braking capability/inability to brake; Skid control engagement during normal braking; Clunking noise from rear left brake
Codes mentioned: C1391, POAA6
Repairs/costs cited: Replacement of brake actuator assembly and brake booster pump assembly required. Cost: $3,400–$4,000 per owner accounts. Parts reported on backorder for months despite availability for purchase.
Recalls/TSBs owners mention: Customer Support Program ZKC (voluntary program for 2008-2010 Highlander Hybrids) covers brake actuator and brake booster pump assembly replacement. Program expired; owners who purchased after program ended denied coverage. Some parts on extended backorder despite manufacturer availability.
O2 Sensor Failures
Oxygen sensors fail repeatedly, triggering check engine light. Owners report replacing multiple sensors (up to three) only to have them fail again. Wiring issues suspected. Owners cite research indicating this is a widespread problem in online forums for 2008 Highlander owners.
When: Recurring failures over years of ownership; no specific mileage cited
Symptoms owners cite: Check engine light illuminated; O2 sensor warning lights on continuously; Repeated sensor failures despite replacement
Repairs/costs cited: O2 sensor replacement cost $600 for three sensors; recurring replacements required despite initial repair, suggesting underlying wiring or electrical fault.
ABS and VSC Sensor Failures
Wheel speed sensors (ABS/VSC) fail intermittently, triggering multiple warning lights. Owners report the sensors malfunction despite Toyota recalibration attempts. One dealer attributed failure to rope damage; replacement did not resolve recurring issues. Corrosion in wheel sensors reported to cause false emergency brake light illumination, creating dangerous driving situations.
When: Starting around 50,000 miles; recurring after recalibration
Symptoms owners cite: ABS sensor light on/off intermittently; VSC (Vehicle Stability Control) light on/off intermittently; Traction/TRAC light illuminated; Skid control engagement; Loss of braking capability; Speed needle malfunction; False emergency brake light from wheel sensor corrosion
Repairs/costs cited: Toyota performed sensor recalibration and replacement; repairs failed to prevent recurrence. No permanent resolution achieved.
Airbag System Failures (Spiral Cable Shorts)
Spiral cable in steering wheel develops shorts, preventing airbag deployment in a crash and disabling horn and cruise control. Multiple owners reported this defect. Toyota acknowledges the problem but has no factory fix. Similar defect prompted a recall of approximately 450,000 Tacomas, but no recall issued for Highlanders despite identical symptoms.
When: No specific mileage pattern; failures occur throughout vehicle ownership
Symptoms owners cite: Airbag warning light illuminated; Airbag light comes on intermittently then remains lit for days; Horn does not function; Cruise control does not function; Airbag may not deploy in a crash
Repairs/costs cited: Spiral cable assembly replacement required. Cost: $276–$491 (part + labor). Multiple owners report this repair as unnecessary cost burden given engineering defect.
Recalls/TSBs owners mention: Toyota customer service acknowledges the spiral cable problem but has no factory fix. No recall issued despite known defect.
Intelligent Power Module (IPM) Failures
Intelligent power module fails causing check engine light and drive motor control module error (P0A1B). Owners report symptoms matching the IPM recall (which affected 235,000 vehicles) but their VINs not included in the recall list. Toyota quotes $9,000+ for replacement. One owner received urgent recall notice requiring immediate replacement but was rationed parts and placed on waiting list for weeks despite stated urgency.
When: Occurs at various mileages; one case at early ownership
Symptoms owners cite: Check engine light illuminated; Multiple warning messages on dashboard; All system warnings appearing simultaneously; Vehicle lurching forward; Vehicle unable to move forward despite engine running
Codes mentioned: P0A1B
Repairs/costs cited: IPM replacement cost $9,000+. One owner received urgent recall letter indicating California regulatory violation if repair not completed, but dealership placed owner on parts waiting list for 2–3+ weeks.
Recalls/TSBs owners mention: Recall issued for certain VINs (235,000 vehicles), but many 2008 Highlanders excluded despite exhibiting identical symptoms. Some owners received urgent recall notices but experienced multi-week parts shortages.
12-Volt Battery Drains and Voltage System Faults
12-volt battery drains rapidly, causing hybrid battery voltage system isolation faults and error messages on dashboard. Brake booster pump suspected of continuing to run long after vehicle shutdown, draining battery. Error messages appear only when 12V battery charge is low. Owners report inverter replacement quoted at $10,000 despite being unrelated to the actual problem.
When: Intermittent; associated with low 12V battery charge
Symptoms owners cite: Error messages on dashboard display; Hybrid battery voltage system isolation fault warning; 12-volt battery drains rapidly; Brake booster pump runs after vehicle shutdown
Codes mentioned: POAA6
Repairs/costs cited: New 12V battery installed by some owners; does not permanently resolve issue. Inverter replacement quoted at $10,000 but considered inappropriate remedy.
Recalls/TSBs owners mention: Dealers have provided no meaningful diagnostics; one dealer refused to test brake booster pump electrical draw or 12V charging system despite owner request.
Seat Heater Electrical Fires
Seat heating element develops electrical fault, causing seat to overheat and ignite. One case involved passenger seat headrest catching fire; another involved smoke and burning smell from seat. Fire department identified cause as electrical in one case. Owners were driving or parked when fires started.
When: One case at approximately 100,100 miles; another at unknown mileage
Symptoms owners cite: Burning smell (paper or electrical odor); Seat back rest becomes charred/blackened; Visible flames in seat; Seat cushion extremely hot to touch; Vehicle engulfed in flames
Repairs/costs cited: One vehicle destroyed by fire. Firefighters unplugged wires from seat to stop heating.
Door Lock System Failures
Remote key fob lock/unlock function stops working. Electrical door lock buttons inside vehicle also fail. One case involved child locked inside vehicle when doors auto-locked without fob inside; smart key safety feature failed to prevent locking. Another case involved erratic auto-locking immediately upon closing rear door with keys inside vehicle.
When: Varies; one reported at 113,000 miles; others without mileage data
Symptoms owners cite: Key fob no longer locks/unlocks doors; Electrical lock button inside car fails; Doors lock automatically without command; Doors lock when child is inside vehicle; Smart key safety feature does not prevent locking with key inside
Repairs/costs cited: Window lock switch recall completed but did not resolve door lock failure. Dealer unable to diagnose root cause in one case. No repair attempted in at least one case.
Power Window Switch Failures
Front driver-side power window malfunctions and emits burning odor when operated. Power window master switch identified as failed component. Related to NHTSA visibility campaign but owner's VIN excluded from recall coverage.
When: At approximately 50,000 miles
Symptoms owners cite: Front driver-side window does not function properly; Burning odor when window operated
Repairs/costs cited: Power window master switch replacement required. Repair not completed as owner determined cost not worth paying out of pocket.
Recalls/TSBs owners mention: NHTSA Campaign 15V689000 (visibility) exists but owner's VIN excluded from recall.
Ignition/Push Button Start Failures
Vehicle fails to start using electronic ignition push button. Dealers replaced ignition switch and neutral safety switch per TSB-0348-09, but problem recurred multiple times, leaving vehicle stranded. Dealer was unable to diagnose root cause.
When: Failures began July 2010; vehicle stranded at least twice, including at 9 PM on Sunday
Symptoms owners cite: Vehicle will not start using push button ignition; Vehicle stranded and unable to restart
Codes mentioned: B2275
Repairs/costs cited: Ignition/power switch replaced (first attempt); neutral safety switch replaced per TSB-0348-09 (second attempt). Problem recurred; no further diagnosis provided.
Electrical System Complete Failures
Entire electrical system fails intermittently over period of six years; no electrical components operate when failure occurs. Independent mechanic unable to diagnose cause. Appears to be intermittent fault that dealer diagnostics cannot replicate.
When: Intermittent over six-year period; failure mileage approximately 19,000
Symptoms owners cite: All electrical components fail to operate; Complete electrical system shutdown
Repairs/costs cited: Independent mechanic diagnosis unavailable; no repair completed.
AC System Electrical Control Faults
Air conditioner emits hot air through vents after turning on and continues to emit hot air after AC turned off, indicating compressor control failure. Dealer diagnosis identified computer chip requiring replacement, but repair not completed.
When: At approximately 63,000 miles
Symptoms owners cite: AC emits hot air through vents; Hot air continues after AC turned off
Repairs/costs cited: Computer chip replacement required; repair not completed.
Recalls/TSBs owners mention: Manufacturer notified but did not offer remedy.
Dashboard Electrical Fires
Smoke appears under dashboard and fire breaks out. Fire department called to extinguish. Vehicle destroyed by fire. Cause unknown but electrical in nature.
When: At approximately 84,000 miles
Symptoms owners cite: Smoke under dashboard; Fire spreads rapidly under dashboard
Repairs/costs cited: Vehicle destroyed; fire department response required.
Hybrid System Catastrophic Failure
While driving, vehicle lurches forward, then all warning messages appear on screen indicating all systems failing and vehicle should be pulled over immediately. Vehicle unable to move forward after stopping despite engine running.
When: At unknown mileage; described as occurring after stop sign on country road
Symptoms owners cite: Vehicle lurches forward unexpectedly; All system warning messages appear simultaneously; Screen displays 'pull over to side of road'; Vehicle unable to move forward after stopping; Engine runs but drivetrain inoperable
Repairs/costs cited: Not documented; vehicle condition upon arrival at dealership not described in complaint.
Wiper and Defroster Electrical Arcing
Windshield wiper defroster begins crackling and smoking, indicating electrical arcing or short circuit in heating element.
When: No mileage provided
Symptoms owners cite: Windshield wiper defroster crackles; Wiper defroster emits smoke
Repairs/costs cited: Owner turned component off and back on; behavior repeated.
Brake Actuator Accumulator Leak (Code C1391)
Brake actuator accumulator develops internal leak, causing brake system malfunction warnings. Part of known defect affecting many 2008 Highlander Hybrid owners. Previous customer support program expired, denying coverage to recent owners despite identical part failure.
When: Varied; one case reported 2–3 years after purchase
Symptoms owners cite: Check ABS warning light; Check Brake System warning light; Check VSC warning light; Emergency brake light illuminated; Red brake system light with buzzer; Yellow ABS warning light; Yellow slip indicator light
Codes mentioned: C1391
Repairs/costs cited: ABS actuator and ABS pump replacement needed. Cost quoted over $4,000. Repair previously covered under Toyota Customer Support Program, but program expired.
Recalls/TSBs owners mention: Customer Support Program previously covered this defect but expired. Toyota has not extended coverage or issued recall for affected owners after program termination.
Synthesized from 38 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
The sensor lights for ABS and vsc have gone on and off intermittently on my 2008 Toyota highlander. Sometimes the brakes engaged the skid control, braking capability is lost and other times the speed needle does not gage properly. The system was inspected by Toyota, who indicated it was due to damage to the sensor from a rope. Toyota supposedly replaced the sensor and they stayed off for a few…
Using a highlander's power-adapter to power my iphone, a significant amount of noise is added to the music output. Toyota dealer has corrected my problem by installing some filters in line before the power adapter socket. *tr
Had electrical trouble with your 2008 Toyota Highlander?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2008 Toyota Highlander?
It's a meaningful issue. 38 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $850.
At what mileage does the electrical typically fail?
Across the 30 complaints that reported odometer mileage, most electrical failures cluster between 48,000 and 144,000 miles, with the median around 93,255. A quarter of owners report trouble before 48,000; a quarter make it past 144,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2008/Toyota/Highlander.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.