{"nhtsa_id":11033447,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-06-04","date":"2026-05-19","document_id":"SA-034-26","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM; UNKNOWN OR OTHER","mfr_system":"Telematics Control Unit (TCU)","summary":"This service alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-047/25 10/07/25 DESCRIPTION When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate the new TCU after replacement. Use the information in this service alert to initialize the new TCU until the procedure on MGSS is updated. CAUTION: DO NOT swap TCU with another vehicle as the TCU is VIN locked after activation. A TCU swap with another vehicle will disable Connected Services on both vehicles. • If TCU activation is not performed, connected vehicle functions will not operate. This will have a negative impact on the customer because they will need to return to the dealer for repairs. • If the Telematics Control Unit (TCU) replacement is necessary, check \"Vehicle Communication Line Status Reference\" status detail first. The TCU can only be replaced under the following \"Status Detail\" conditions: Open Completed (OK) ○ Closed Completed (OK) ○ ○ If the TCU is replaced under the following \"Status Detail\" conditions, the customer may not be able to enroll into the replacement TCU. Processing (NG) ○ Request Failed (NG) ○ Open Failed (NG) ○ Flag Setting Failed TCU Activation 1. Install the new TCU.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11033447-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11033447-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11033447","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MAZDA","model":"CX-30","year_from":2020,"year_to":2026,"match":"exact","vehicle_ids":["2020_mazda_cx-30","2021_mazda_cx-30","2022_mazda_cx-30","2023_mazda_cx-30","2024_mazda_cx-30","2025_mazda_cx-30","2026_mazda_cx-30"]},{"make":"MAZDA","model":"CX-5","year_from":2021,"year_to":2025,"match":"exact","vehicle_ids":["2021_mazda_cx-5","2022_mazda_cx-5","2023_mazda_cx-5","2024_mazda_cx-5","2025_mazda_cx-5"]},{"make":"MAZDA","model":"CX-50","year_from":2023,"year_to":2026,"match":"exact","vehicle_ids":["2023_mazda_cx-50","2024_mazda_cx-50","2025_mazda_cx-50","2026_mazda_cx-50"]},{"make":"MAZDA","model":"CX-50 HYBRID","year_from":2025,"year_to":2025,"match":"base","vehicle_ids":["2025_mazda_cx-50"]},{"make":"MAZDA","model":"CX-70","year_from":2025,"year_to":2026,"match":"exact","vehicle_ids":["2025_mazda_cx-70","2026_mazda_cx-70"]},{"make":"MAZDA","model":"CX-70 PLUG-IN HYBRID","year_from":2025,"year_to":2026,"match":"base","vehicle_ids":["2025_mazda_cx-70","2026_mazda_cx-70"]},{"make":"MAZDA","model":"CX-9","year_from":2021,"year_to":2023,"match":"exact","vehicle_ids":["2021_mazda_cx-9","2022_mazda_cx-9","2023_mazda_cx-9"]},{"make":"MAZDA","model":"CX-90","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_mazda_cx-90","2025_mazda_cx-90","2026_mazda_cx-90"]},{"make":"MAZDA","model":"CX-90 PLUG-IN HYBRID","year_from":2024,"year_to":2026,"match":"base","vehicle_ids":["2024_mazda_cx-90","2025_mazda_cx-90","2026_mazda_cx-90"]},{"make":"MAZDA","model":"MAZDA3","year_from":2019,"year_to":2026,"match":"exact","vehicle_ids":["2019_mazda_mazda3","2020_mazda_mazda3","2021_mazda_mazda3","2022_mazda_mazda3","2023_mazda_mazda3","2024_mazda_mazda3","2025_mazda_mazda3","2026_mazda_mazda3"]},{"make":"MAZDA","model":"MX-30","year_from":2022,"year_to":2023,"match":"exact","vehicle_ids":["2022_mazda_mx-30","2023_mazda_mx-30"]},{"make":"MAZDA","model":"MX-5","year_from":2024,"year_to":2026,"match":"exact","vehicle_ids":["2024_mazda_mx-5","2025_mazda_mx-5","2026_mazda_mx-5"]}],"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":[]}