{"nhtsa_id":634815,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2002-10-09","date":"2002-03-01","document_id":"010730023B","mfr_campaign":null,"replaces":"010730023A","component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"SOME CUSTOMERS MAY COMMENT ON A HARSH 1-2 UPSHIFT AND THE CHECK ENGINE LIGHT OR SERVICE ENGINE SOON INDICATOR IS ILLUMINATED AND DIAGNOSTIC TROUBLE CODE P1870 SET. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/634815","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":["P1870"],"topics":[],"vehicles":[{"make":"BUICK","model":"ROADMASTER","year_from":1996,"year_to":1996,"match":"exact","vehicle_ids":["1996_buick_roadmaster"]},{"make":"CADILLAC","model":"ESCALADE","year_from":1999,"year_to":2000,"match":"exact","vehicle_ids":["1999_cadillac_escalade","2000_cadillac_escalade"]},{"make":"CADILLAC","model":"FLEETWOOD","year_from":1996,"year_to":1996,"match":"exact","vehicle_ids":["1996_cadillac_fleetwood"]},{"make":"CHEVROLET","model":"CAMARO","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_chevrolet_camaro","1997_chevrolet_camaro","1998_chevrolet_camaro","1999_chevrolet_camaro","2000_chevrolet_camaro"]},{"make":"CHEVROLET","model":"CHEVROLET TRUCK","year_from":1996,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"CHEVROLET","model":"CORVETTE","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_chevrolet_corvette","1997_chevrolet_corvette","1998_chevrolet_corvette","1999_chevrolet_corvette","2000_chevrolet_corvette"]},{"make":"GMC","model":"GMC","year_from":1996,"year_to":2000,"match":null,"vehicle_ids":[]},{"make":"OLDSMOBILE","model":"BRAVADA","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_oldsmobile_bravada","1997_oldsmobile_bravada","1998_oldsmobile_bravada","1999_oldsmobile_bravada","2000_oldsmobile_bravada"]},{"make":"PONTIAC","model":"FIREBIRD","year_from":1996,"year_to":2000,"match":"exact","vehicle_ids":["1996_pontiac_firebird","1997_pontiac_firebird","1998_pontiac_firebird","1999_pontiac_firebird","2000_pontiac_firebird"]}],"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":[]}