Service bulletin 21-045-15
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 | 10149666 |
| Published by NHTSA | 2018-12-03 |
| Manufacturer's number | 21-045-15 |
| Manufacturer's date | 2015-07-03 |
| NHTSA component | POWER TRAIN |
NHTSA's summary
Flash: 8HP70 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 of more of the following conditions. ? Bump sensation during low speed tip-in acceleration. ? Downshift engine flare during coast down deceleration at higher altitudes. ? Bump sensation during 6-5 downshift. ? Bump sensation during 1-2 upshift. ? Intermittent delayed upshifts in 1st or 2nd gear. ? Less than desired shift quality when operating the vehicle in Four Wheel Drive (4WD) Low mode. ? With the vehicle stationary and the Selec-Terrain system set to Snow Mode, the transmission will perform a 2-1 downshift when pressing the (+) steering wheel mounted shift paddle instead of remaining in 2nd gear.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Transmission and driveline
| JEEP GRAND CHEROKEE | 2015 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 2016184 | 2016-04-26. Powertrain |
|---|---|
| 16V240000 | 2016-04-25. POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE (TCM/PCM/TECM) |
A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.
| S2623000023 | 2026-04-15. Service bulletin. Power Liftgate Inoperative. |
|---|---|
| S2621000003 REV.A | 2026-03-18. Service bulletin. The vehicle will exhibit a service transmission/check engine warning indicator for the following transmission models: 845RE, 8HP45, 850RE, 8HP50, 8HP70, 8HP75, 8HP75-PHEV, 8HP75-LCV, 8HP90, 8HP95. Transmissions may exhibit the following diagnostic codes: P07E4, P1DB2, P0716, P1B14, P0733, P1D90, P1DB7, P1B13. |
| 101232 | 2024-11-07. Service bulletin. Plate - Planetary |
| 2104014 | 2023-02-21. Service bulletin. 8HP70 Transmission Shift Enhancements |
| 2103914 | 2023-02-21. Service bulletin. Transmission Shift Enhancements |
| 2103814 | 2023-02-21. Service bulletin. 8HP70 SRT Transmission Shift Enhancements |
| 1806714 | 2023-02-21. Service bulletin. MIL Illumination, P1CF3 Battery Temperature Sensor Out of Range Low |
| 1806314 | 2023-02-21. Service bulletin. 5.7L Powertrain Diagnostic And System Improvements |
| 1807414 | 2023-01-17. Service bulletin. Flash: 3.0L Powertrain Diagnostic And System Enhancements This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. The following software is being released to improve A/C compressor relay duty cycle operation to prevent ignition off battery draw. |
| W41 | 2023-01-09. Service bulletin. Customer Satisfaction Notification W41 Reprogram Powertrain Control Module |