Owners report sudden loss of power steering assist and steering wheel lock-up at speeds ranging from 40 to 50 mph, sometimes while stopped or during turns. One owner's vehicle flipped into a ditch at 50 mph with steering failure; they sustained facial and leg injuries. The EPS warning light frequently illuminates before failure. Multiple owners cycled ignition off and on to restore steering, only to have it fail again.
The defect ties to NHTSA recall 15V144000 for a faulty EPS ECU circuit board, yet several owners report their VINs were excluded from the recall despite exhibiting identical symptoms. When these vehicles failed, Toyota dealerships denied coverage and told owners to return "when it happens again."
Supply chain failure has plagued the recall itself. Owners scheduled repairs in May 2015 were still waiting weeks or months into June with no parts available. Dealerships couldn't provide ETAs. One service department reported multiple Highlanders backordered over a month. Toyota customer service stated parts only ship after a vehicle is confirmed defective—not pre-positioned despite the urgent safety designation.
Additional electrical issues compound steering failures: dashboard and instrument panel shutdowns during driving, engine stalling, and complete loss of electrical power correlating with steering pauses or warnings. Dealers couldn't retrieve diagnostic codes or replicate these intermittent events, leaving owners without repair options.
Failure modes owners describe
EPS ECU Circuit Board Failure with Steering Lock-Up
Electric power steering (EPS) circuit board failure causing sudden loss of power steering assist and steering wheel lock-up. The defect affects multiple vehicles despite some VINs being excluded from recall 15V144000. Failure can occur during various driving conditions including acceleration, turns, or while stationary.
When: Various mileage points: 15,425 miles (collision incident), 38,040 miles, 43,000 miles, 63,000 miles; failures occurring as early as startup and up to two years of ownership
Symptoms owners cite: Complete loss of power steering assist; Steering wheel becomes locked or seized; Steering wheel becomes extremely difficult to turn; EPS warning light illuminates on dash; Loss of steering control at highway speeds (40–50 mph); Steering intermittently locks up during normal operation; Steering wheel requires multiple restart cycles to restore function
Codes mentioned: 15V144000 (NHTSA Recall Campaign for EPS)
Repairs/costs cited: EPS ECU circuit board replacement required. One owner paid for battery replacement ($expensive per narrative) before the true cause was identified. Toyota replaced steering computer under warranty (at no charge) for one vehicle not included in recall.
Recalls/TSBs owners mention: NHTSA Recall Campaign 15V144000 for unexpected loss of electric power steering. Some vehicle VINs excluded from recall despite exhibiting identical symptoms. Toyota denies problem on some vehicles and instructs owners to return 'when it happens again.' Parts availability severely delayed; multiple owners report dealer backlogs of over one month.
EPS ECU Part Shortage and Recall Repair Delays
Widespread supply chain failure for EPS ECU replacement parts. Dealerships unable to provide completion timelines despite recall being designated urgent. Owners left without vehicles for extended periods while waiting for parts that remain on backorder.
When: May–June 2015 timeframe for initial recalls; parts backorder since prior to May with no estimated arrival dates given
Symptoms owners cite: Dealerships unable to provide ETAs on replacement parts; Parts remain backordered indefinitely; Multiple Highlanders at same dealership waiting over one month for parts; Initial recall letters suggest quick 4-hour repair; parts not available when vehicle arrives for service
Codes mentioned: 15V144000
Repairs/costs cited: EPS ECU replacement; estimated 2.5–4 hours labor once part is available. Dealerships did not stock parts despite urgent recall designation.
Recalls/TSBs owners mention: Toyota stated parts only sent when vehicle identified as needing repair (not pre-positioned). Toyota customer service unable to provide reasonable timelines. One owner's case assigned to Toyota Customer Experience Center; parts scheduled 'sometime during June' per corporate communication in early June.
Steering Difficulty and Loss of Control During Acceleration
Owners report severe steering difficulty, loss of control, and unexpected steering behavior during acceleration or at highway speeds. Vehicle pulls hard left or steering becomes stiff without warning. One incident resulted in vehicle flipping into ditch.
When: Variable; some ongoing since purchase (December 2014) or recurring over months
Symptoms owners cite: Steering becomes extremely difficult to turn; Steering feels stiff or locked without warning; Vehicle pulls hard to the left during acceleration; Loss of steering control during turns at stop signs; Steering becomes firm and wheel moves independently left and right; One crash incident: vehicle steered into ditch at 50 mph and flipped
Codes mentioned: 15V144000 (recall related)
Repairs/costs cited: One crash resulted in vehicle destruction and deployment of airbags; owner sustained facial and leg injuries. Vehicle had reportedly been repaired per recall but owner claims never informed of recall or repair.
Recalls/TSBs owners mention: Recall 15V144000 was applied to at least one vehicle involved in crash, per dealer statement, though owner denies being informed. Dealership unable to replicate problem or diagnose cause in other cases.
Intermittent Electrical Resets Coinciding with Steering Issues
Dashboard, instrument panel, and infotainment system reboot or shut down during normal driving. These electrical events coincide with steering pauses or warnings. Some owners experience engine stalling and complete loss of electrical power.
When: Variable; as early as 33,000 miles; recurring over two years for one owner
Symptoms owners cite: Dashboard and navigation screens shut off and reboot; All programmed system information erased after reboot; Radio and entertainment system shut down while driving; Steering pauses or feels unresponsive during electrical shutdown; Engine stalls at various speeds and during turns; Entire instrument panel goes blank; Warning message: 'will lose steering'
Codes mentioned: Fault code not retrieved (mechanics unable to access or retrieve code during failure)
Repairs/costs cited: Dealers unable to replicate failures or retrieve diagnostic codes. No repairs completed for these intermittent events in reported narratives.
Recalls/TSBs owners mention: Toyota service told owners 'no codes found' and attributed to glitches. One mechanic stated nothing was wrong.
Steering Wheel Wander and Torque Steer
Steering input becomes erratic with wheel wandering or independent movement. At highway speeds and during acceleration, vehicle exhibits severe torque steer pulling hard to the left requiring driver to fight the wheel.
When: Ongoing issue; occurring during highway acceleration and passing maneuvers
Symptoms owners cite: Steering wheel wanders from time to time; Steering wheel independently moves left and right without driver input; Vehicle pulls hard left during acceleration at highway speed; Steering becomes difficult when accelerating from stop or during passing; Requires significant driver input to maintain control during acceleration
Repairs/costs cited: One dealership technician dismissed complaint, stating 'all our front wheel drive cars do it.' No repair attempted.
Recalls/TSBs owners mention: Dealership claimed problem is normal behavior; no recall or repair offered.
EPS Warning Light and Intermittent Steering Stiffness
EPS warning light illuminates accompanied by increased steering resistance. Cycling ignition off and on restores normal steering temporarily. Issue recurs multiple times.
When: Variable mileage; one incident at 38,040 miles
Symptoms owners cite: EPS warning light illuminates on dash cluster; Steering becomes harder to turn; Steering stiffness resolves after ignition reset; Problem recurs multiple times over time
Codes mentioned: EPS Failure warning code (displayed but not formally retrieved)
Repairs/costs cited: One owner with vehicle outside recall had steering computer replaced under warranty at no charge by Toyota dealer.
Recalls/TSBs owners mention: For vehicle outside recall (per VIN), Toyota replaced steering computer under warranty. Manufacturer should expand recall scope.
Steering Column Electrical Connection Issue
Cruise control lever illumination flickers off and on during vehicle motion and steering column use, indicating electrical connectivity problem in steering column assembly.
When: Alternator already required replacement at 73,000 miles
Symptoms owners cite: Cruise control lever light flickers off and on during motion; Problem occurs when steering column is in use
Repairs/costs cited: <UNKNOWN>
Recalls/TSBs owners mention: Dealership advised issue was reported but told owner nothing was wrong with lever.
Intermittent Steering Wheel Squeak Noise
Squeaking noise heard when turning steering wheel left or right during highway and local driving.
When: <UNKNOWN>
Symptoms owners cite: Intermittent squeaking noise when turning steering wheel left or right; Occurs on highway and local roads
Repairs/costs cited: <UNKNOWN>
Synthesized from 25 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.