# Service bulletin 21\-027\-15 REV\-A

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.

- Type: Service bulletin
- NHTSA id: 10148956
- Published by NHTSA: 2018\-11\-26
- Manufacturer's number: 21\-027\-15 REV\-A
- Manufacturer's date: 2015\-08\-05
- NHTSA component: POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2015/MC-10148956-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2015/MC-10148956-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline, Automatic transmission

## Trouble codes named

P0734, P1B13, P1DCD

## Vehicles listed

- 2015 DODGE DURANGO
- 2015 JEEP GRAND CHEROKEE

## Recalls for the same vehicles and component

- [16V240000](/recalls/nhtsa/16V240000.md), 2016-04-25: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)

## Other bulletins for the same vehicles and component

- [2103914](/bulletins/10232023.md), 2023-02-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. Transmission Shift Enhancements
- [1806714](/bulletins/10232004.md), 2023-02-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN; ELECTRICAL SYSTEM. MIL Illumination, P1CF3 Battery Temperature Sensor Out of Range Low
- [S1709000010](/bulletins/10229031.md), 2023-01-09, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Customer complaints may include abnormal engine noise, rough idle, lack of power, misfire. Upon investigation, it may be found that there is excessive camshaft lobe wear/lifter wear \(roller failure\) on one or more cam lobes and that camshaft/lifter replacement is necessary.
- [V51](/bulletins/10228020.md), 2022-12-19, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); UNKNOWN OR OTHER. Customer Satisfaction Notification V51 Reprogram Powertrain Control Module
- [W41](/bulletins/10221748.md), 2022-09-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Customer Satisfaction Notification W41 Reprogram Powertrain Control Module
- [2102815](/bulletins/10220462.md), 2022-09-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION. 8HP70 Tranmission shift enhancements.
- [18\-047\-15 REV. A](/bulletins/10216177.md), 2022-07-25, Service bulletin: EQUIPMENT; POWER TRAIN:AUTOMATIC TRANSMISSION; BACK OVER PREVENTION; ELECTRICAL SYSTEM. Flash: 3.0L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp \(MIL\) Illumination. Upon further investigation, a technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) stored in the PCM memory. ? P204F\-00 \- Reductant System Performance ? P20E9\-00 \- Reductant Pressure Too High ? P249C\-00 \- Excessive Time To Enter Closed Loop Reductant Injection Control ? P2002\-00 \- Diesel Particulate Filter Efficiency Below Threshold ? P20C2\-00 \- Reductant Heater 3 Control Circuit Performance ? P2299\-00 \- Brake Pedal Position/Accelerator Pedal Position Incompatible ? P208B\-00 \- Reductant Pump 1 Control Performance ? P1288\-00 \- NOX Sensor 1/2 Zero Offset Too High
- [18\-070\-15](/bulletins/10216152.md), 2022-07-25, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); EQUIPMENT; ELECTRICAL SYSTEM. Flash: PCM Software Improvements This bulletin involves reprogramming the Powertrain Control Module \(PCM\) with the latest available software. A small number of customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation a technician may find the following Diagnostic Trouble Codes \(DTCs\) set in the PCM memory. ? P0301\- Cylinder 1 Misfire ? P0302\- Cylinder 2 Misfire ? P0303\- Cylinder 3 Misfire ? P0304\- Cylinder 4 Misfire ? P0305\- Cylinder 5 Misfire ? P0306\- Cylinder 6 Misfire ? P0300\- Multiple Cylinder Misfire ? P0513\- Invalid SKIM Key
- [25\-002\-15 REV. A](/bulletins/10216146.md), 2022-07-25, Service bulletin: POWER TRAIN:MANUAL TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); EQUIPMENT ADAPTIVE/MOBILITY; FUEL SYSTEM, GASOLINE. P0455 And/Or P0456 Set In The PCM This bulletin involves replacing the evaporative emissions purge valve hose due to a split in the hose that will prevent the system from sealing. The customer may experience a Malfunction Indicator Lamp \(MIL\) while driving. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes \(DTCs\) set in the PCM memory. ? P0455 EVAP System Large Leak ? P0456 EVAP System Small Leak
- [9004509](/bulletins/10212248.md), 2022-05-31, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:FILTER/SCREEN. Oil Filter If a Mopar Oil Filter is not available, use a filter that meets or exceeds USCAR36 specification and is compatible with semi and full synthetic oils. Recommended Brands: Wix, Purolator, and NapaGold

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