This batch shows serious electronic throttle management issues. Owners describe the vehicle accelerating on its own when shifting from Park to Drive, reaching 30 mph without pedal input—yet the tachometer stays at normal idle RPM, pointing to an electronic glitch rather than mechanical runaway. Multiple dealership visits found nothing reproducible.
More common is throttle hesitation: slow response when accelerating, followed by a sudden surge that catches owners off guard during merging. One owner had it happen at 20,000 miles; dealers said it's a "design feature" and reprogramming the engine control module didn't help. Another mode is outright refusal to accelerate—pedal pressed, engine won't respond for a couple of seconds. Toyota's own response to one owner was that this is "normal" for their drive-by-wire setup.
One report describes engine fire at low city speed with zero warning from gauges or lights—grill melting, hood scorched, release cable destroyed by heat. One owner reported overheating with adequate coolant and no other symptoms.
The common thread: electronic throttle and engine management faults that dealers cannot diagnose or repair, combined with one catastrophic thermal event.
Failure modes owners describe
Unintended acceleration from stop
Vehicle accelerates on its own when shifting from Park to Drive without driver input, reaching speeds up to 30 mph. Tachometer does not show elevated engine speed while parked, suggesting electronic cause. Occurs intermittently and has been to multiple dealerships without reproduction or repair.
When: Intermittent, shift Park to Drive
Symptoms owners cite: Vehicle accelerates without gas pedal input; Reaches speeds up to 30 mph; Tachometer does not show high RPM in Park; Intermittent occurrence
Repairs/costs cited: Multiple dealership visits; issue could not be duplicated so no repair performed
Throttle hesitation and surge during acceleration
Slow throttle response when accelerating, followed by sudden lurch forward during merging and low-speed acceleration. Multiple owners report stuttering and surging behavior starting at 20,000 miles. Dealer acknowledged as 'design feature' of electronic throttle. ECM reprogramming attempted but ineffective.
When: Starting at 20,000 miles; during merging and low-speed acceleration
Symptoms owners cite: Slow throttle response after depressing pedal; Sudden lurch forward (surge); Stuttering during acceleration; Safety risk during merging
Repairs/costs cited: ECM reprogrammed under warranty without resolution; dealers unable to provide solution
Recalls/TSBs owners mention: Dealer stated issue is a design feature of electronic throttle
Acceleration refusal (limp mode)
Vehicle refuses to accelerate when pressed, lasting approximately 2 seconds before resuming. Occurs at various speeds (2 mph and 30 mph documented). Toyota stated this is a 'normal phenomenon' in their drive-by-wire systems.
When: Intermittent; during low-speed driving and at cruising speed
Symptoms owners cite: Refuses to accelerate when pedal pressed; Temporary loss of power (2-second delay); Occurs at low and cruising speeds
Repairs/costs cited: ECM recalibration attempted; issue could not be duplicated
Recalls/TSBs owners mention: Toyota stated this is a normal phenomenon in drive-by-wire systems
Hesitation during shifts and acceleration
Vehicle hesitates during acceleration and sometimes during deceleration. ECM recalibration improved shifting hesitation but reduced fuel economy. Another dealer's diagnostic showed no issues detected.
When: During acceleration and deceleration
Symptoms owners cite: Hesitation during acceleration; Hesitation during deceleration; Occurs intermittently
Repairs/costs cited: ECM recalibrated; improved shifting hesitation but reduced gas mileage
Engine fire with no warning indicators
Vehicle emitted smoke from engine hood area while driving at low city speeds. Grill and hood were melting and scorched. No trouble lights or high-temperature gauge readings preceded the incident. Fire Department unable to open hood due to melted release cable. Vehicle required towing.
When: While driving at low city speeds; no prior warning
Symptoms owners cite: Smoke from engine hood area; Melting grill and scorched hood; Extreme heat causing cable melting; No warning lights or gauge indication
Repairs/costs cited: Vehicle towed to repair facility after fire suppression
Engine overheating without coolant loss
Engine overheated while driving to pick up children from school. Coolant level full in radiator and brakes functioning normally, indicating isolated cooling system malfunction.
When: During normal driving
Symptoms owners cite: Engine overheating; Coolant level adequate; No brake issues
Synthesized from 11 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.