{"nhtsa_id":10089319,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2017-01-23","date":"2016-06-03","document_id":"15821 BULLETIN","mfr_campaign":null,"replaces":null,"component":"ENGINE AND ENGINE COOLING:EXHAUST SYSTEM","mfr_system":null,"summary":"15821 - SPECIAL COVERAGE. A MALFUNCTION INDICATOR LAMP (MIL) MAY ILLUMINATE WITH DIAGNOSTIC TROUBLE CODE (DTC) P0420, CATALYST SYSTEM LOW EFFICIENCY, STORED. THIS COULD OCCUR AS A RESULT OF AN EXHAUST LEAK AT THE CONNECTION OF THE BANK 1 CATALYTIC CONVERTER OUTLET TO THE MUFFLER INLET PIPE. NO OTHER DTCS WILL BE STORED. THIS SPECIAL COVERAGE COVERS THE CONDITION DESCRIBED ABOVE FOR A PERIOD OF 8 YEARS OR 80,000 MILES (130,000 KM), WHICHEVER OCCURS FIRST, FROM THE DATE THE VEHICLE WAS ORIGINALLY PLACED IN SERVICE, REGARDLESS OF OWNERSHIP. DEALERS WILL REPLACE THE EXHAUST PIPE CLAMP.","document":null,"url":"https://open.wenmarpro.com/bulletins/10089319","components":[{"id":"engine","name":"Engine","parent":null},{"id":"exhaust-emissions","name":"Exhaust and emissions","parent":null}],"codes":["P0420"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"SILVERADO 1500","year_from":2013,"year_to":2013,"match":"base","vehicle_ids":["2013_chevrolet_silverado"]},{"make":"GMC","model":"SIERRA 1500","year_from":2013,"year_to":2013,"match":"base","vehicle_ids":["2013_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":[]}