# P1DDE on the 2019 Ram 1500

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.

## Bulletins for this model year that name P1DDE

- [10220623](https://open.wenmarpro.com/bulletins/10220623), 2022-09-26: 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 Diagnostic Trouble Codes \(DTCs\) have been set:P1DDE\-00 \- Ignition Run\-Start Input 1\-2 Correlation. P1DF3\-00 \- ECU Not Initialized. P07E4\-00 \- Unable To Engage Park. P0735\-00 \- Gear 5 Shift Incorrect Ratio. The customer may also notice the following condition: Drivetrain "clunks" or harsh/rough upshifts, specifically going into 2nd, 3rd or 4th gears. The following enhancements are also included in this software update:Improvement to the 5\-3\-2 downshift to preventDTC P0735\-00. Shifter auto\-position correction with ignition in the ?Run/Acc? positions during an AutoPark event.
- [10188827](https://open.wenmarpro.com/bulletins/10188827), 2021-03-15: 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 Diagnostic Trouble Codes \(DTCs\) have been set:P1DDE\-00 \- Ignition Run\-Start Input 1\-2 Correlation. P1DF3\-00 \- ECU Not Initialized. P07E4\-00 \- Unable To Engage Park. P0735\-00 \- Gear 5 Shift Incorrect Ratio. The customer may also notice the following condition: Drivetrain "clunks" or harsh/rough upshifts, specifically going into 2nd, 3rd or 4th gears. The following enhancements are also included in this software update:Improvement to the 5\-3\-2 downshift to preventDTC P0735\-00. Shifter auto\-position correction with ignition in the ?Run/Acc? positions during an AutoPark event.
- [10175740](https://open.wenmarpro.com/bulletins/10175740), 2020-05-26: 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. P1DF3\-00 \- ECU Not Initialized. P07E4\-00 \- Unable To Engage Park. P0735\-00 \- Gear 5 Shift Incorrect Ratio. The following enhancement is included in this software update:Improvement to the 5\-3\-2 downshift to prevent DTC P0735\-00. Shifter auto\-position correction with ignition in RUN/ACC positions during an AutoPark event.
- [10173368](https://open.wenmarpro.com/bulletins/10173368), 2020-04-06: 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
- [10173360](https://open.wenmarpro.com/bulletins/10173360), 2020-04-06: Flash: Transmission Control Module \(TCM\) Updates This bulletin involves reprogramming the TCM with the latest available software. Some customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find one or more of the following DTCs: P1DDE\-00 \- Ignition Run\-Start Input 1\-2 Correlation\(Sales Code DFR Only\). P1DF3\-00 \- ECU Not Initialized\(Sales Code DFR Only\). 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. P0731\-00 \- Gear 1 Shift Incorrect Ratio. P0979\-00 \- Shift Solenoid 3 Control Circuit Low. P1DCD\-00\-TCM Monitoring Processor Performance Multiple Clutches Locked Up. In addition, the following software enhancements are also available:Auto\-start Improvements. Low speed coast down bump improvements. Tip in bump improvements. Bump during tow/haul high throttle acceleration. Gear hunting during cruise resume. Gear hunting during uphill trailer tow. Cruise control under\-speed during uphill trailer tow. Gear hunting during highway speed operation. Hang in gear when driver desires earlier upshift/lower engine speed operation. Coast\-down downshift improvements for 6\-5, 5\-4 and 4\-3. Coast\-down downshift improvements for 2\-1. Cold temperature downshift improvements for 6\-5 and 4\-3. Cold temperature upshift improvements for 1\-2, 2\-3, 3\-4