{"nhtsa_id":11015496,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-03-11","date":"2025-02-10","document_id":"T-SB-0021-25","mfr_campaign":"T-SB-0021-25","replaces":null,"component":"ENGINE","mfr_system":null,"summary":"Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream+ (GTS+) ECU flash reprogramming procedures and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard+ (CUW+). To ensure the correct ECU software is installed, ECUs will require a Security Signature before the ECU will initialize the flash reprogramming sequence. This bulletin also details the process for acquiring a Security Signature from TIS during the GTS+ ECU flash reprogramming process.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11015496-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11015496-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11015496","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"TOYOTA","model":"4RUNNER I-FORCE MAX HYBRID","year_from":2025,"year_to":2025,"match":"base","vehicle_ids":["2025_toyota_4runner"]},{"make":"TOYOTA","model":"BZ4X","year_from":2023,"year_to":2025,"match":"exact","vehicle_ids":["2023_toyota_bz4x","2024_toyota_bz4x","2025_toyota_bz4x"]},{"make":"TOYOTA","model":"COROLLA","year_from":2023,"year_to":2025,"match":"exact","vehicle_ids":["2023_toyota_corolla","2024_toyota_corolla","2025_toyota_corolla"]},{"make":"TOYOTA","model":"COROLLA 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CRUISER","year_from":2024,"year_to":2024,"match":null,"vehicle_ids":[]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}