“Toyota observed certain diagnostic data during development testing of a new Plug-in Hybrid Electric Vehicle (PHEV) model. After investigation, Toyota found that the memory in the battery ECU can fail an operation check because a part of the memory address location utilized by the battery control IC overlaps with a part utilized by the monitoring IC. The monitoring IC could repeatedly overwrite data at the same memory address used by the battery control IC when the memory operational check cycle matches the monitoring IC’s write operation cycle,” Toyota said in the mandatory safety defect recall filling made published by the National Highway Traffic Safety Administration (NHTSA) this morning.

“However, Toyota determined that, even though similar software is utilized for certain BEV models being introduced to the market, the same condition would not occur because of a difference in the cycling of the monitoring IC’s write operation,” Toyota said.

Dealers will update the battery ECU software, free of charge as required by U.S. safety legislation [49 CFR § 573 – AutoCrat.] Owner notification letters are not expected to be mailed until 3 August 2026. Owners may contact Toyota’s customer service at 1-800-331-4331. Toyota’s numbers for this recall are 26LA07 and 26TA11. Subaru’s number for this recall is WRG26.