TSB NUMBER: 21-026-14
GROUP: Transmission and Transfer Case
DATE: August 27, 2014
SUBJECT: Flash: Transmission Shift Enhancements
OVERVIEW: This bulletin involves flash reprogramming of the Transmission Control Module (TCM) with new software.
MODELS: 2014 (WK) Grand Cherokee
NOTE: This bulletin applies to vehicles built on or before July 01, 2014, equipped with the 3.0L engine (Sales Code EXF) and the 8HP70 Automatic Transmission (Sales Codes DFD).
SYMPTOM/CONDITION:
(note: ** changes from prior TSB flash **)
· ** 3-2, 2-1 Shift bump on deceleration. **
· ** Shift quality during hard acceleration. **
· ** Excessive shifts during cruise control operation. **
· ** Intermittent delay shift condition. **
· ** Engine braking improvements during downhill descent. **
· ** Manual gear selection improvements at higher altitudes. **
· ** Drivability improvements 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.
Download PDF at: Jeep Grand Cherokee WK2 - 2011-2016 Grand Cherokee Service Bulletins and Recalls
--Milous
GROUP: Transmission and Transfer Case
DATE: August 27, 2014
SUBJECT: Flash: Transmission Shift Enhancements
OVERVIEW: This bulletin involves flash reprogramming of the Transmission Control Module (TCM) with new software.
MODELS: 2014 (WK) Grand Cherokee
NOTE: This bulletin applies to vehicles built on or before July 01, 2014, equipped with the 3.0L engine (Sales Code EXF) and the 8HP70 Automatic Transmission (Sales Codes DFD).
SYMPTOM/CONDITION:
(note: ** changes from prior TSB flash **)
· ** 3-2, 2-1 Shift bump on deceleration. **
· ** Shift quality during hard acceleration. **
· ** Excessive shifts during cruise control operation. **
· ** Intermittent delay shift condition. **
· ** Engine braking improvements during downhill descent. **
· ** Manual gear selection improvements at higher altitudes. **
· ** Drivability improvements 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.
Download PDF at: Jeep Grand Cherokee WK2 - 2011-2016 Grand Cherokee Service Bulletins and Recalls
--Milous