{"nhtsa_id":10138906,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2018-06-04","date":"2017-06-09","document_id":"21-002-17 REV. A","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN","mfr_system":null,"summary":"Flash: Transmission Diagnostic and Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. Some customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find the following Diagnostic Trouble Code (DTC) stored in the TCM memory:P1DCD-00 - TCM Monitoring Processor Performance Multiple Clutches Locked Up. In addition, customers may also experience the following condition:During an engine limp mode condition, the transmission remains in a fixed gear. This update allows transmission gear shifting while in limp-in mode, rather than a fixed gear. Bumps on 2-1 and 6-5 down-shift while braking. This software update also includes an enhancement:Improved 5-4 down-shift.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10138906-9999.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2017/MC-10138906-0001.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10138906","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"software","name":"Software","parent":"electrical"}],"codes":["P1DCD"],"topics":[],"vehicles":[{"make":"JEEP","model":"GRAND CHEROKEE","year_from":2017,"year_to":2017,"match":"exact","vehicle_ids":["2017_jeep_grand-cherokee"]}],"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":[]}