{"nhtsa_id":10173368,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2020-04-06","date":"2020-02-15","document_id":"21-011-20","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN; ELECTRICAL SYSTEM:SOFTWARE","mfr_system":null,"summary":"Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following DTCs have been set:P1DDE-00 - Ignition Run-Start Input 1-2 Correlation(Sales Code DFR Only). P1DF3-00 - ECU Not Initialized(Sales Code DFR Only). P0456 - EVAP System Small Leak. P0733-00 - Gear 3 Shift Incorrect Ratio (while operating in 4-Lo range). P0716-00 - Input Shaft Speed Sensor 1 Performance. P0721-00 - Output Shaft Speed Sensor Circuit Performance. P1DB6-00 - Vehicle Speed Signal Performance. P1DAB-00 - Vehicle Speed Undetermined. P215C-00 - Output Shaft Speed Wheel Speed Correlation. P0607-00 - ECU Internal Performance. P1DAC-00 - Engine Speed Undetermined. P07BF-00 - Input/Turbine Shaft Speed Sensor 1 Circuit Low. P07C0-00 - Input/Turbine Shaft Speed Sensor 1 Circuit High. P077C-00 - Output Shaft Speed Sensor Circuit Low. P077D-00 - Output Shaft Speed Sensor Circuit High. P177F-00 - Output Shaft Speed Sensor Out Of Range High. P1778-00 - Input-Turbine Shaft Speed Sensor A Out Of Range High. In addition, the following software enhancements are also available:Engine Stop/Start (ESS) Autostart improvements to adapt to Powertrain Control Module (PCM) and Hybrid Control Processor (HCP) changes. Coast-down downshift improvements for 4-3 on slight down hill and light braking. Low pedal kick-down bump improvement on 3-2 and 2-1 downshift. Improve 2-3 upshift at Wide Open Throttle (WOT) in tow/haul mode. Improve 5-6-5 gear hunt after cruise control resume acceleration. Cruise control improvement to help maintain speeds in tow/haul mode up hill. Improve 4-5 gear hunt in tow/haul up hill. Improve 7-8 gear hunt. Improve low speed upshift, stays in a lower gear to long. 1-2 coast-down shift improvements when coming to a stop. Shifter auto-position correction with ignition in RUN/ACC","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10173368-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2020/MC-10173368-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10173368","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"powertrain","name":"Transmission and driveline","parent":null},{"id":"software","name":"Software","parent":"electrical"}],"codes":["P0456","P0607","P0716","P0721","P0733","P077C","P077D","P07BF","P07C0","P1778","P177F","P1DAB","P1DAC","P1DB6","P1DDE","P1DF3","P215C"],"topics":[],"vehicles":[{"make":"RAM","model":"1500","year_from":2019,"year_to":2019,"match":"exact","vehicle_ids":["2019_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":[]}