# Service bulletin 21\-045\-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: 10181604
- Published by NHTSA: 2020\-10\-26
- Manufacturer's number: 21\-045\-20
- Manufacturer's date: 2020\-09\-11
- NHTSA component: POWER TRAIN

## NHTSA's summary

Flash: Transmission Control Module \(TCM\) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience any one of the following: An audible clunk after applying throttle from a coasting condition, predominantly in fifth and sixth gear while driving 48\-72 kph \(30\-45 mph\). Poor shift quality or ?bump? experienced during 2\-1 coast downs with light brake or no brake applied. Vehicle does not default to automatic drive. Paddle shifters are disabled. "Shift not allowed' displayed in cluster when attempting to upshift while already in 9th gear.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181604-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2020/MC-10181604-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2019 JEEP CHEROKEE

## Recalls for the same vehicles and component

- [2026224](/recalls/tc/2026224.md), 2026-05-07: Powertrain
- [26V290000](/recalls/nhtsa/26V290000.md), 2026-05-07: POWER TRAIN
- [2025012](/recalls/tc/2025012.md), 2025-01-16: Powertrain
- [25V011000](/recalls/nhtsa/25V011000.md), 2025-01-16: POWER TRAIN
- [18V739000](/recalls/nhtsa/18V739000.md), 2018-10-19: POWER TRAIN:AUTOMATIC TRANSMISSION
- [2018422](/recalls/tc/2018422.md), 2018-08-09: Powertrain
- [18V492000](/recalls/nhtsa/18V492000.md), 2018-07-26: POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [03\-001\-26](/bulletins/11035038.md), 2026-07-18, Service bulletin: POWER TRAIN. Unable to Complete 01C Recall Drive Cycle C14A7\-97 Active Technicians may experience the following: SYMPTOM: ● After performing Recall 01C, the vehicle may get a 'Service AWD' message on the EVIC.
- [14082](/bulletins/11031348.md), 2026-04-15, Warranty extension: POWER TRAIN. \(XX1\) Two Speed Power Transfer Unit \(PTU\) \- Select 2017 \- 2019 Jeep Cherokee \(KL\)
- [14081](/bulletins/11031347.md), 2026-04-15, Warranty extension: POWER TRAIN. \(XX1\) Two Speed Power Transfer Unit \(PTU\) \- Select 2017 \- 2019 Jeep Cherokee \(KL\)
- [14079](/bulletins/11031346.md), 2026-04-15, Warranty extension: POWER TRAIN. \(XX1\) Two Speed Power Transfer Unit \(PTU\) \- Select 2017 \- 2019 Jeep Cherokee \(KL\)
- [14078](/bulletins/11031345.md), 2026-04-15, Warranty extension: POWER TRAIN. \(XX1\) Two Speed Power Transfer Unit \(PTU\) \- Select 2017 \- 2019 Jeep Cherokee \(KL\)
- [111447](/bulletins/11031344.md), 2026-04-15, Warranty extension: POWER TRAIN. ID\-26\-19 \(XX1\) Two Speed Power Transfer Unit \(PTU\) \- Select 2017 \- 2019 Jeep Cherokee \(KL\)
- [111432](/bulletins/11031343.md), 2026-04-15, Warranty extension: POWER TRAIN. D\-26\-10 \(XX1\) Two Speed Power Transfer Unit \(PTU\) \- Select 2017 \- 2019 Jeep Cherokee \(KL\)
- [21\-027\-26 REV. A](/bulletins/11031328.md), 2026-04-15, Service bulletin: POWER TRAIN. Two Speed Power Transfer Unit Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ? C1494\-07 \- PTU Fork Position\-Mechanincal Failures. Customers m
- [21\-027\-26](/bulletins/11031327.md), 2026-04-15, Service bulletin: POWER TRAIN. Two Speed Power Transfer Unit Customers must experience a Malfunction Indicator Lamp \(MIL\) illumination and the vehicle must SYMPTOM: exhibit/set the following Diagnostic Trouble Code \(DTC\): ? C1494\-07 \- PTU Fork Position\-Mechanincal Failures. Customers m
- [S1721000016 REV.B](/bulletins/11026812.md), 2025-12-23, Service bulletin: POWER TRAIN. Service 4wd Light On, AWD System Service Required Message Illuminated. Diagnostic Trouble Code \(DTC\) C14A7\-97 PTU Motor Component Or System Operation Obstructed Or Blocked.

JSON: [/v1/bulletins/10181604](/v1/bulletins/10181604)

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