# Service bulletin 21\-019\-20

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: 10175142
- Published by NHTSA: 2020\-05\-18
- Manufacturer's number: 21\-019\-20
- Manufacturer's date: 2020\-03\-12
- NHTSA component: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)

## NHTSA's summary

Flash: Transmission Control Module \(TCM\) Updates This bulletin involves reprogramming the TCM with the latest available software. The customer may notice one or more of the following conditions:A loud whistle noise upon engine start up. Rough and/or erratic transmission shifting between gears during normal drive cycles.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10175142-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10175142-9999.pdf)

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

## Components

Electrical system, Transmission and driveline, Automatic transmission, Software, Transmission control module

## Vehicles listed

- 2020 JEEP GRAND CHEROKEE

## Other bulletins for the same vehicles and component

- [BulletinA](/bulletins/10240002.md), 2023-07-31, Service bulletin: ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. Customer Satisfaction Notification ZD7 \- Radio Software Update
- [S1808000152](/bulletins/10234438.md), 2023-04-17, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). CEL \(Check Engine Lamp\) Illuminates, Recent PCM Replace or Flash Update Performed, Diagnostic Trouble Codes \(DTCs\) P057B Brake Pedal Position Sensor Circuit Performance, P1572 Brake Pedal Stuck, C0042\-54 Brake Pedal Missing Calibration
- [2103322](/bulletins/10230559.md), 2023-01-23, Service bulletin: ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Transmission Control Module \(TCM\) Updates
- [2102622](/bulletins/10225271.md), 2022-10-31, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM; POWER TRAIN; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE:SOFTWARE. Flash: Transmission Control Module \(TCM\) Updates This bulletin involves reprogramming the TCM with the latest available software. The customer may notice the following condition:Poor coast down quality \(bump/clunk\) at approximately 16\-32 kph \(10\-20 mph\) range in manual mode.
- [S2125000002](/bulletins/10221288.md), 2022-09-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Customer complaint includes a Mil\-on condition. Upon further investigation, one or more of the following fault codes may be set in the PCM:
- [S2125000002](/bulletins/10212447.md), 2022-05-31, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Customer complaint includes a Mil\-on condition. Upon further investigation, one or more of the following fault codes may be set in the PCM:
- [18\-079\-20 REV. A](/bulletins/10184776.md), 2020-12-28, Service bulletin: EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Powertrain Control Module \(PCM\) Updates \- AN\-K8\-18\-20201102 Refer to China Joint Venture \(JV\) released document AN\-K8\-18\-20201102, for details on this service action.
- [18\-079\-20 REV. A](/bulletins/10184476.md), 2020-12-21, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\); ELECTRICAL SYSTEM; EQUIPMENT ADAPTIVE/MOBILITY. Flash: Powertrain Control Module \(PCM\) Updates \- AN\-K8\-18\-20201102 Refer to China Joint Venture \(JV\) released document AN\-K8\-18\-20201102, for details on this service action.
- [18\-092\-20](/bulletins/10183063.md), 2020-11-30, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Powertrain Control Module \(PCM\) Updates This bulletin involves reprogramming the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp \(MIL\) illumination. Upon further investigation the technician may find the following \(DTC\) has been set:P00FD\-00 \- Battery B State Of Charge Performance.
- [18\-091\-20](/bulletins/10181638.md), 2020-10-26, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\). Flash: Powertrain Control Module \(PCM\) Updates \- AN\-K8PHEV\-18\-20200926 Refer to China Joint Venture \(JV\) released document AN\-K8PHEV\-18\-20200926, for details on this service action.

JSON: [/v1/bulletins/10175142](/v1/bulletins/10175142)

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