{"nhtsa_id":10148955,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-11-26","date":"2015-08-05","document_id":"21-025-15 REV-A","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN:AUTOMATIC TRANSMISSION","mfr_system":null,"summary":"Flash: 854RE Transmission Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience one or more of the following Symptom/Condition(s) and/or a Malfunction Indicator Lamp (MIL) due to an erroneous Diagnostic Trouble Code (DTC): ? P1DCD - TCM monitoring processor performance multiple clutches locked up. ? P1B13 - Park-By-Wire unintended out of park position. ? P0734 - Gear 4 Shift Incorrect Ratio set in the TCM memory. ? Bump sensation felt during engine start/stop transition on light throttle acceleration (Engine Stop Start (ESS) equipped vehicles only). ? Less than desired overall downshifts during normal driving. ? Less than desired downshifts during passing maneuvers. ? Less than desired upshift quality in lower gears.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10148955-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2015/MC-10148955-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10148955","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"automatic-transmission","name":"Automatic transmission","parent":"powertrain"}],"codes":["P0734","P1B13","P1DCD"],"topics":[],"vehicles":[{"make":"RAM","model":"1500","year_from":2015,"year_to":2015,"match":"exact","vehicle_ids":["2015_ram_1500"]}],"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":[]}