{"vehicle":{"id":"2004_gmc_sierra","year":2004,"make":"GMC","model":"Sierra"},"code":"P0721","generic":true,"description":null,"bulletins":{"as_of":"2026-10-19","count":3,"bulletins":[{"nhtsa_id":10014863,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2005-05-11","date":null,"document_id":"3155","mfr_campaign":null,"component":"ELECTRICAL SYSTEM","summary":"NO SHIFT, SPEEDOMETER ERRATIC/INOPERATIVE, P0721 C0237 P0500 C0055. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10014863"},{"nhtsa_id":10005508,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-03-02","date":"2004-01-01","document_id":"01493","mfr_campaign":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","summary":"ALLISON LCT1000 PRNDL FLASH AND/OR WILL NOT MOVE WITH P0721, P0731, P0732, P0733, P0734, P0743, P0746, P0747, P0776, P0777, P1720, P1721, P1723 AND P1724. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10005508"},{"nhtsa_id":10005451,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2004-02-27","date":"2004-01-01","document_id":"00574A","mfr_campaign":null,"component":"ELECTRICAL SYSTEM","summary":"ALLISON LCT1000 NO SHIFT, SPEEDOMETER ERRATIC/INOPERATIVE, DIAGNOSTIC TROUBLE CODES (DTCS) P0721, C0237 POSSIBLE ANTI-LOCK BRAKE SYSTEM (ABS) LAMP ON. SI BULLETIN 1408789. *TT","document":null,"url":"https://open.wenmarpro.com/bulletins/10005451"}],"url":"https://open.wenmarpro.com/makes/gmc/sierra/2004/bulletins?code=P0721"},"related":{"components":[],"bulletins":[],"recalls":{"may_apply":true,"recalls":[],"lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null}}},"url":"https://open.wenmarpro.com/makes/gmc/sierra/2004/codes/P0721","note":"The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.","attribution":["Contains information licensed under the Open Government Licence – Canada."]}