# P0734 on the 2015 Jeep Grand Cherokee

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.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0734

- [10217400](https://open.wenmarpro.com/bulletins/10217400), 2022-08-08: Flash: Transmission Shift Enhancements This bulletin involves reprogramming of the Transmission Control Module \(TCM\) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp \(MIL\) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code \(DTC\) stored in the TCM memory. In addition, the following TCM calibration improvements are also available for vehicles equipped with the 845RE 8 speed transmission \(Sales Code DFL\). These improvements are listed per engine application. 3.0L Gas Engine \(Sales Code EHD\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved upshift timing. ? Improved torque converter engagement. ? Improved shift timing during tow mode operation. ? Improved shift points during aggressive driving. ? Calibration improvement to correct bump feel during 2\-1 downshift. ? Improved shift timing while in snow, base, and hill modes. 3.6L Gas Engine \(Sales Code ERB\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved 4\-3 and 3\-2 downshifts. ? Improved shift timing at higher altitudes. ? Improved shift timing while in sand mode. ? Calibration improvement for multi\-gear downshift timing during passing maneuvers. ? Calibration improvement for intermittent delayed upshift.
- [10216162](https://open.wenmarpro.com/bulletins/10216162), 2022-07-25: Flash: Transmission Shift Enhancements This bulletin involves reprogramming of the Transmission Control Module \(TCM\) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp \(MIL\) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code \(DTC\) stored in the TCM memory. In addition, the following TCM calibration improvements are also available for vehicles equipped with the 845RE 8 speed transmission \(Sales Code DFL\). These improvements are listed per engine application. 3.0L Gas Engine \(Sales Code EHD\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved upshift timing. ? Improved torque converter engagement. ? Improved shift timing during tow mode operation. ? Improved shift points during aggressive driving. ? Calibration improvement to correct bump feel during 2\-1 downshift. ? Improved shift timing while in snow, base, and hill modes. 3.6L Gas Engine \(Sales Code ERB\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved 4\-3 and 3\-2 downshifts. ? Improved shift timing at higher altitudes. ? Improved shift timing while in sand mode. ? Calibration improvement for multi\-gear downshift timing during passing maneuvers. ? Calibration improvement for intermittent delayed upshift.
- [10151743](https://open.wenmarpro.com/bulletins/10151743), 2018-12-17: Flash: Transmission Shift Enhancements This bulletin involves reprogramming of the Transmission Control Module \(TCM\) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp \(MIL\) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code \(DTC\) stored in the TCM memory. In addition, the following TCM calibration improvements are also available for vehicles equipped with the 845RE 8 speed transmission \(Sales Code DFL\). These improvements are listed per engine application. 3.0L Gas Engine \(Sales Code EHD\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved upshift timing. ? Improved torque converter engagement. ? Improved shift timing during tow mode operation. ? Improved shift points during aggressive driving. ? Calibration improvement to correct bump feel during 2\-1 downshift. ? Improved shift timing while in snow, base, and hill modes. 3.6L Gas Engine \(Sales Code ERB\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved 4\-3 and 3\-2 downshifts. ? Improved shift timing at higher altitudes. ? Improved shift timing while in sand mode. ? Calibration improvement for multi\-gear downshift timing during passing maneuvers. ? Calibration improvement for intermittent delayed upshift.
- [10150548](https://open.wenmarpro.com/bulletins/10150548), 2018-12-10: Flash: Transmission Shift Enhancements This bulletin involves reprogramming of 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 Diagnostic Trouble Code \(DTC\) P0734 \- Gear 4 Shift Incorrect Ratio stored in the TCM memory. In addition, the following TCM calibration improvements are also available for vehicles equipped with the 845RE 8 speed transmission \(sales code DFL\). These improvements are listed per engine application. 3.0L gas engine \(sales code EHD\) ? Improved upshift timing. ? Improved torque converter engagement. ? Improved shift timing during tow mode operation. ? Improved shift points during aggressive driving. ? Calibration improvement to correct bump feel during 2\-1 downshift. ? Improved shift timing while in snow, base, and hill modes. 3.6L gas engine \(sales code ERB\) ? Improved 4\-3 and 3\-2 downshifts. ? Improved shift timing at higher altitudes. ? Improved shift timing while in sand mode. ? Calibration improvement for multi\-gear downshift timing during passing maneuvers. ? Calibration improvement for intermittent delayed upshift.
- [10148972](https://open.wenmarpro.com/bulletins/10148972), 2018-11-26: Flash: Transmission Shift Enhancements This bulletin involves reprogramming of the Transmission Control Module \(TCM\) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp \(MIL\) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code \(DTC\) stored in the TCM memory. In addition, the following TCM calibration improvements are also available for vehicles equipped with the 845RE 8 speed transmission \(Sales Code DFL\). These improvements are listed per engine application. 3.0L Gas Engine \(Sales Code EHD\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved upshift timing. ? Improved torque converter engagement. ? Improved shift timing during tow mode operation. ? Improved shift points during aggressive driving. ? Calibration improvement to correct bump feel during 2\-1 downshift. ? Improved shift timing while in snow, base, and hill modes. 3.6L Gas Engine \(Sales Code ERB\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio. ? Improved 4\-3 and 3\-2 downshifts. ? Improved shift timing at higher altitudes. ? Improved shift timing while in sand mode. ? Calibration improvement for multi\-gear downshift timing during passing maneuvers. ? Calibration improvement for intermittent delayed upshift.
- [10148956](https://open.wenmarpro.com/bulletins/10148956), 2018-11-26: Flash: Transmission Shift Enhancements This bulletin involves reprogramming of the Transmission Control Module \(TCM\) with the latest available software. A small number of customers may experience an erroneous Malfunction Indicator Lamp \(MIL\) Illumination. Upon further investigation, the technician may find a Diagnostic Trouble Code \(DTC\) stored in the TCM memory. In addition, the following TCM calibration improvements are also available for vehicles equipped with the 845RE 8 speed transmission \(Sales Code DFL\). These improvements are listed per engine application. 3.0L Gas Engine \(Sales Code EHD\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio ? Improved upshift timing. ? Improved torque converter engagement. ? Improved shift timing during tow mode operation. ? Improved shift points during aggressive driving. ? Calibration improvement to correct bump feel during 2\-1 downshift. ? Improved shift timing while in snow, base, and hill modes. 3.6L Gas Engine \(Sales Code ERB\) ? P1DCD \- TCM monitoring processor performance multiple clutches locked up. ? P1B13 \- Park\-By\-Wire unintended out of park position. ? P0734 \- Gear 4 Shift Incorrect Ratio ? Improved 4\-3 and 3\-2 downshifts. ? Improved shift timing at higher altitudes. ? Improved shift timing while in sand mode. ? Calibration improvement for multi\-gear downshift timing during passing maneuvers. ? Calibration improvement for intermittent delayed upshift.