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Jeep TSB #21-048-19
2018 Jeep Grand Cherokee
TSB Document:
Affected Component: ELECTRICAL SYSTEM
- Summary
- Flash: Transmission Control Module (TCM) Updates This bulletin involves reprogramming the TCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble Codes (DTCs) have been set: P0979-00 - Shift Solenoid 3 Control Circuit Low. P0219-00 - Engine Overspeed Condition. In addition, the customer may notice the following condition:A harsh shift on coast down 3-2 or 2-1.
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