{"nhtsa_id":10222263,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2022-10-03","date":"2022-10-03","document_id":"N222375000","mfr_campaign":null,"replaces":null,"component":"VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM","mfr_system":null,"summary":"In certain vehicles, equipped with a manual HVAC system (RPO: C4P), the K33 HVAC Control Module may not properly enable the heater auxiliary coolant pump to maintain cabin heater temperature during engine auto stop events. Reprogram the K33 HVAC Control Module with updated software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10222263-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2022/MC-10222263-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10222263","components":[{"id":"visibility","name":"Glass, wipers and mirrors","parent":null},{"id":"hvac","name":"Heating and air conditioning","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2020,"year_to":2022,"match":"base","vehicle_ids":["2020_chevrolet_silverado","2021_chevrolet_silverado","2022_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2020,"year_to":2022,"match":"base","vehicle_ids":["2020_gmc_sierra","2021_gmc_sierra","2022_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":[]}