{"nhtsa_id":11029443,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-03-03","date":"2026-02-27","document_id":"PIT6474A","mfr_campaign":null,"replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":null,"summary":"This PI addresses an issue where the customer may experience a loss of brake assist, accompanied by numerous MILs and warnings, after the engine has started, caused by a drop in battery voltage to the Brake System Control module. Dealers are to clean and tighten battery cable connections, test the vehicle battery and charging system, and update the Brake System control module with updated software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029443-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11029443-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11029443","components":[],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2022,"year_to":2024,"match":"base","vehicle_ids":["2022_chevrolet_silverado","2023_chevrolet_silverado","2024_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2022,"year_to":2024,"match":"base","vehicle_ids":["2022_gmc_sierra","2023_gmc_sierra","2024_gmc_sierra"]}],"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":[]}