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Jeep TSB #21-012-15
2014 Jeep Grand Cherokee
TSB Document:
Affected Component: EQUIPMENT
- Summary
- Flash: Transmission Shift Enhancements This bulletin involves reprogramming the Transmission Control Module (TCM) with the latest available software. ? ECO mode will not retain settings. If ECO mode is turned off, it will turn back on after the ignition is cycled. ? 3-2, 2-1 Shift bump on deceleration. ? Less than desired shift quality during hard acceleration. ? Excessive shifts during cruise control operation. ? Intermittent delay shift condition. ? Less than desired engine braking during downhill descent. ? Manual gear selection improvements at higher altitudes. ? Less than desired driveability performance in 4 low. ? Hesitation improvements. ? Inconsistent and/or harsh 1-2, 2-3, 3-4, 4-5 upshifts at moderate throttle. ? Inconsistent and/or harsh lift-foot upshifts. ? Inconsistent and/or harsh coasting 3-2, 2-1 downshifts in Hi or Lo range. ? Ratio fault detection during 1-2 upshift or 8-7 downshift. ? Grade hunting (repeated shifting while ascending a grade). ? 8-7-8 shift busyness when approaching max vehicle speed. ? Undesired gear selection at high altitude. ? Undesired gear selection when driving downhill (not enough powertrain braking). ? Time to exit TIP (manual/paddle shift mode) takes too long. ? Unintended downshifts driving at certain speeds. ? 4-3 coasting downshift may cause excessive engine noise during engine braking. ? Shift hanging when vehicle is started cold. ? Undesired shift toggling in Manual/Paddle Shift mode. ? Lo range selec-speed control 1-2 shift busyness.
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