Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp...
Jeep technical service bulletin 21-009-26 for 2018 Jeep Grand Cherokee.
- Bulletin number
- 21-009-26
- Component
- Power train
- Summary
- Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ● P0979-00 - Shift Solenoid 3 Control Circuit Low. ● P0219-00 - Engine Overspeed Condition. ● P0731-00 - Gear 1 Shift Incorrect Ratio. Customers may experience the following: ● Shift shudder and shift shock during wide open throttle, high clutch energy shift. The following software update is also included: ● Improved high RPM in coasting situations for the 1-2 shift This bulletin involves reprogramming the TCM with the latest available software.
Owners of these vehicles have filed 75 complaints in the transmission category.
Vehicles covered
- Jeep Grand Cherokee 2018 2018
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