Toyota has opened a federal recall covering 617 new SUVs after discovering that a batch of forged aluminum steering knuckles skipped a required heat-treatment step on the production line, leaving the parts weaker than they are supposed to be. The recall, filed with the National Highway Traffic Safety Administration under campaign number 26V598000, spans the 2026 Toyota Grand Highlander, Lexus TX and Lexus RX, all of which share the same knuckle supplied by an outside forging plant.
Toyota traced the defect to a production run at Bharat Forge Aluminum USA’s plant in Sanford, North Carolina, where a batch of knuckles “skipped the aging furnace entirely,” according to the automaker’s filing, preventing the forged aluminum from reaching its required tensile strength. The gap was caught during a routine quality audit in June 2026, when a tensile-strength test on parts from that batch came back below specification.
Six model lines, one shared part
The 617 affected vehicles break down across six distinct model and powertrain combinations built on the same platform: 126 Toyota Grand Highlanders, 127 Grand Highlander Hybrids, 61 Lexus TX 350s, 23 Lexus TX 500h models, 196 Lexus RX 350s, 83 Lexus RX 350h models and a single Lexus RX 500h, a breakdown detailed in the NHTSA filing summary for campaign 26V598000. All are 2026 model-year vehicles, reflecting how recently the suspect batch of knuckles entered the assembly line before the audit caught it. Toyota’s filing states plainly that a steering knuckle from the affected batch “may crack and break, which can result in a loss of vehicle steering control,” a risk that centers on the strut and tie-rod attachment points where the part absorbs the most load.
The aging furnace step Toyota says the batch skipped is a heat-treatment process standard across forged aluminum automotive parts, where the metal is held at an elevated temperature for a set period after forging to let its internal structure settle into a stronger, more stable state. Skipping that step does not change how a part looks or how it fits during assembly, which is part of why a batch that missed the furnace can pass initial visual and dimensional checks and still make it onto a finished vehicle before a strength test catches the shortfall.
Why a pothole or curb strike is the trigger
The failure mode Toyota describes is not gradual wear but a sudden impact event. Under normal conditions, a correctly aged knuckle can absorb repeated hits from potholes or curbs without damage, but a part that skipped the aging furnace loses much of that impact tolerance. According to Toyota’s own risk language, cited in reporting from autoevolution, “after sudden impacts (think pothole or curb strikes), the knuckle is prone to fracture at the strut attachment point, the tie-rod attachment point, or both,” language that ties the defect directly to an everyday driving scenario rather than to extreme use. A fracture at either point can produce reduced or fully lost steering control on the affected corner of the vehicle.
Toyota has said it has received no field reports or warranty claims connected to the defect as of the recall’s filing, meaning the campaign was triggered entirely by the internal audit rather than by any reported crash or steering failure in customer hands, a point separately confirmed in coverage of the filing. That timing distinguishes this recall from many that follow consumer complaints, and it means the fix is reaching owners before, rather than after, any documented real-world incident.
Toyota and Lexus build the Grand Highlander, TX and RX on closely related underpinnings, which is why a single supplier’s forging batch could reach all three nameplates at once rather than staying confined to one brand. The Grand Highlander and Grand Highlander Hybrid draw 126 and 127 units respectively from the affected batch, while the Lexus RX line, spread across its 350, 350h and 500h variants, accounts for the largest single share at 280 combined units, with the newer three-row TX contributing the remaining 84 across its 350 and 500h trims.
What owners of the 617 vehicles should do
Toyota and Lexus dealers will perform a borescope inspection of both front steering knuckles on each affected vehicle to determine whether it came from the suspect batch, replacing any knuckle that does at no cost to the owner. Notification letters are scheduled to go out to owners between November 2 and November 16, 2026, under Toyota’s internal recall numbers 26TA19 and 26LA09. Owners with questions in the meantime can contact Toyota customer service directly at 1-800-331-4331 or check their vehicle identification number against the open campaign, a step Kelley Blue Book and other outlets covering the filing both recommend owners take through NHTSA’s recall lookup tool.
Because the recall was filed before the defect produced any known injury or crash, Toyota has not disclosed additional detail on how it plans to prevent similar gaps from reaching other batches of the same supplier’s parts. The company’s filing does not name whether Bharat Forge Aluminum USA has changed its quality-control process at the Sanford plant since the June audit, leaving that question, along with the total number of Grand Highlander, TX and RX models built on the same line during the same window, unanswered for now.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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