{"nhtsa_id":11027627,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2026-01-14","date":"2026-01-08","document_id":"21-001-26","mfr_campaign":null,"replaces":null,"component":"POWER TRAIN","mfr_system":null,"summary":"Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0826-00 - Up/Down Shift Switch. ● P0827-00 - Up/down Shift Switch Circuit Low. ● P085F-00 - Up And Down Shift Switch Circuit Range/performance. Customers may also experience one or more of the following: ● **Customer is unable to switch the ignition to OFF when in Park gear. ● After shifting into Park, the Instrument Panel Cluster (IPC) will display that the transmission is in Neutral.** NOTE: **The transmission will actually be in Park and able to hold the vehicle, but the cluster display would indicate Neutral, preventing the engine from shutting off.** ● Rough/bumpy 2-3 power on upshifts and/or 3-2 coast down shifts. ● Vehicle enters into limp home mode. Other software improvements: ● Decreased sensitivity to DTCs P1D8A and P1D8B. This bulletin involves reprogramming the TCM with the latest available software.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11027627-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2026/MC-11027627-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11027627","components":[{"id":"powertrain","name":"Transmission and driveline","parent":null}],"codes":["P0826","P0827","P085F","P1D8A","P1D8B"],"topics":[],"vehicles":[{"make":"RAM","model":"3500","year_from":2025,"year_to":2025,"match":"exact","vehicle_ids":["2025_ram_3500"]}],"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":[]}