WenmarOpen by Wenmar Pro

Service bulletins for the 2015 Ram 1500

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.

590 on file from NHTSA, as of 2026-10-19.

About P0734 on the 2015 Ram 1500: what the code means, and the bulletins and recalls about the same components.

By type

By component

By trouble code

Only bulletins with trouble code: P0734 are shown. Show all

Bulletins, newest first
21-025-152018-12-10. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. Flash: 854RE Transmission Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customer may experience one or more of the following. ? Malfunction Indicator Lamp (MIL) illumination with Diagnostic Trouble Code (DTC) 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.
21-025-15 REV-A2018-11-26. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION. 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.
21-036-162017-11-03. Service bulletin. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM). Flash: 845RE 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.In addition, customers may experience the following conditions: Bump sensation felt during engine start/stop transition on light throttle acceleration (Stop-Start Multiple VSM System Sales Code XBU 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.The following improvements are included in this update: Engine start/stop calibration update to allow Park and Neutral to be considered valid stop positions (Stop-Start Multiple VSM System Sales Code XBU equipped vehicles only).

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.