{"nhtsa_id":617787,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2001-03-27","date":"2000-12-15","document_id":"151200","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM:12V/24V/48V BATTERY","mfr_system":null,"summary":"SUBJECT REGARDING DIAGNOSTIC TROUBLE CODE P1871 ON VEHICLES EQUIPPED WITH A 8.1-LITER GAS ENGINES AND THE ALLISON LCT1000 TRANSMISSION. IT HAS BEEN FOUND THAT THIS CODE EXISTS ON UNITS WITH LOW BATTERY VOLTAGE DURING ENGINE CRANKING DUE TO A LOW STATE OF CHARGE IN THE BATTERY. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/617787","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"battery","name":"12-volt battery","parent":"electrical"}],"codes":["P1871"],"topics":[],"vehicles":[{"make":"CHEVROLET","model":"CHEVROLET","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]},{"make":"GMC","model":"GMC","year_from":null,"year_to":null,"match":null,"vehicle_ids":[]}],"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":[]}