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Jeep TSB #21-019-20
2020 Jeep Grand Cherokee
TSB Document:
Affected Component: BACK OVER PREVENTION
- 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.
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