{"nhtsa_id":11036471,"type":"over_the_air","type_name":"Over-the-air update","date_added":"2026-08-31","date":"2026-08-05","document_id":"662.21","mfr_campaign":"662.21","replaces":null,"component":"UNKNOWN OR OTHER","mfr_system":"BCM, TCM, ECM: BCM (Body Control Module), TCM (Transmission Control Module), ECM (Engine Control Module)","summary":"• Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes for accuracy of low tire pressure alert. • Fixes for speed threshold for pedestrian alerts. • Improvements to start reliability and reduced check engine light activation • Improvements to turbo system diagnostics • Improvements to reliability when extending the running boards on your vehicle • Improves transmission diagnostic software. • Reduces unnecessary check engine light activations. • Fixes to help extend coolant valve life through diagnostic changes","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036471-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11036471-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11036471","components":[],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2025,"year_to":2025,"match":"base","vehicle_ids":["2025_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2025,"year_to":2025,"match":"base","vehicle_ids":["2025_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":[]}