P1634 on the 2015 Ram Promaster City
The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.
This code is specific to a manufacturer and is not described here. Its meaning is in the manufacturer's service information.
| 2101817 | 2022-10-24. Service bulletin. Flash: Transmission Diagnostic and Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (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:P1634 - TCM Internal Watchdog Performance. P0887 - TCM Power Control Circuit High. P1720 - Output Speed Sensor-Wheel Speed Rationality. P1DCCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. P1DAD - Input Shaft-Output Shaft Direction Correlation. P1CC9 - Unable To Engage Gear. This software release also includes the following improvements:Calibrations to support changes in air flow to protect the catalyst. Transmission shift quality. Enable the capability to capture non-DTC control module data through the Uconnect data recording system. |
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| 21-018-17 REV. A | 2022-09-15. Service bulletin. Flash: Transmission Shift and Driveability Enhancements This bulletin involves reprogramming the Transmission Control Module (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 Diagnostic Trouble Codes (DTCs):P0887 - TCM Power Control Circuit High. P1720 - Output Speed Sensor-Wheel Speed Rationality. P1634 - Output Speed Sensor-Wheel Speed Rationality. P1DCCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. P1DAD - Input Shaft-Output Shaft Direction Correlation. P1CC9 - Unable To Engage Gear. In addition the following enhancements are included:Calibrations to support changes in air flow to protect the catalyst. Transmission shift quality. Enable the capability to capture non-DTC control module data through the Uconnect data recording system. |
| 21-039-15 REV B | 2019-05-20. Service bulletin. Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs). ? P1720 - Output Speed Sensor-Wheel Speed Rationality. ? P1634 - Output Speed Sensor-Wheel Speed Rationality. ? P1DCCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. ? P0887 - TCM Power Control Circuit High. ? P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. ? P1DAD - Input Shaft-Output Shaft Direction Correlation. ? P1CC9 - Unable To Engage Gear. In addition to the above conditions, this software release also includes improvements to: ? Transmission shift quality. ? Enable the capability to capture non Diagnostic Trouble Code (DTC) control module data through the Uconnect Data Recording system. |
| 21-039-15 REV-A | 2018-11-26. Service bulletin. Flash: Transmission Shift And Drivability Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs). ? P1720 - Output Speed Sensor-Wheel Speed Rationality. ? P1634 - Output Speed Sensor-Wheel Speed Rationality. ? P1DCCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. ? P0887 - TCM Power Control Circuit High. ? P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. ? P1DAD - Input Shaft-Output Shaft Direction Correlation. ? P1CC9 - Unable To Engage Gear. In addition to the above conditions, this software release also includes improvements to: ? Transmission shift quality. ? Enable the capability to capture non Diagnostic Trouble Code (DTC) control module data through the Uconnect Data Recording system. |
| 21-018-17 REV. A | 2018-06-04. Service bulletin. Flash: Transmission Shift and Driveability Enhancements This bulletin involves reprogramming the Transmission Control Module (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 Diagnostic Trouble Codes (DTCs):P0887 - TCM Power Control Circuit High. P1720 - Output Speed Sensor-Wheel Speed Rationality. P1634 - Output Speed Sensor-Wheel Speed Rationality. P1DCCD - TCM Monitoring Processor Performance Multiple Clutches Locked Up. P0711 - Transmission Fluid Temperature Sensor A Circuit Range-Performance. P1DAD - Input Shaft-Output Shaft Direction Correlation. P1CC9 - Unable To Engage Gear. In addition the following enhancements are included:Calibrations to support changes in air flow to protect the catalyst. Transmission shift quality. Enable the capability to capture non-DTC control module data through the Uconnect data recording system. |
5 on file from NHTSA, as of 2026-10-19. See them in the bulletin list. A bulletin lists model years: read the document for which vehicles it concerns.