post #1 of Old 09-24-2015, 01:27 PM Thread Starter
kkarmin
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Loud clunk

I have a 2015 Jeep Grand Cherokee, I heard a loud clunk under my vehicle today. I could actually feel it, I thought I ran something over and it hit the bottom of the vehicle. Checked in the mirror and even went back to that street, there were only leaves in the street. I was on a residential street and I was only going around 20 MPH, it startled me when it happened. I do notice sometimes when I go to accelerate, the vehicle will hesitate slightly and I would hear a small clunk. It will be going in for an oil change in Oct., should I have it looked at sooner.

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post #2 of Old 09-30-2015, 08:35 AM
JeepCares
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Quote:
Originally Posted by kkarmin View Post
I have a 2015 Jeep Grand Cherokee, I heard a loud clunk under my vehicle today. I could actually feel it, I thought I ran something over and it hit the bottom of the vehicle. Checked in the mirror and even went back to that street, there were only leaves in the street. I was on a residential street and I was only going around 20 MPH, it startled me when it happened. I do notice sometimes when I go to accelerate, the vehicle will hesitate slightly and I would hear a small clunk. It will be going in for an oil change in Oct., should I have it looked at sooner.

Hey kkarmin,

TSB 21-039-14 may relate to your vehicle:

SUBJECT:
Flash: Transmission Shift Enhancements
OVERVIEW:
This bulletin involves reprogramming of the Transmission Control Module (TCM) with the
latest available software.
MODELS:
2015 (WK) Jeep Grand Cherokee
NOTE: This bulletin applies to vehicles equipped with the following options:
Vehicles equipped with a 3.0L gas engine (sales code EHD) and
equipped with the 845RE 8 speed transmission (sales code DFL) built
on or after July 23, 2014 (MDH 0723XX) and built on or before October
17, 2014 (MDH 1017XX).
Vehicles equipped with a 3.6L gas engine (sales code ERB) and
equipped with the 845RE 8 speed transmission (sales code DFL) built
on or after July 21, 2014 (MDH 0721XX) and built on or before October
17, 2014 (MDH 1017XX).
Vehicles equipped with a 5.7L gas engine (sales code EZH) and
equipped with the 8HP70 8 speed transmission (sales code DFD) or
(sales code DFK) built on or after July 21, 2014 (MDH 0721XX) and built
on or before October 17, 2014 (MDH 1017XX).
NUMBER: 21-039-14
GROUP: Transmission and
Transfer Case
DATE: November 25, 2014
SYMPTOM/CONDITION:
The following TCM calibration improvements are available for vehicles equipped with the
845RE 8 speed transmission (sales code DFL) or 8HP70 8 speed transmission (sales
code DFD or DFK). These improvements are listed per engine application.
3.0L gas engine (sales code EHD)
Improved upshift timing.
Improved torque converter engagement.
Improved shift timing during tow mode operation.
Improved shift points during aggressive driving.
Calibration improvement to correct bump feel during 2-1 downshift.
Improved shift timing while in snow, base, and hill modes.
3.6L gas engine (sales code ERB)
Improved 4-3 and 3-2 downshifts.
Improved shift timing at higher altitudes.
Improved shift timing while in sand mode.
Calibration improvement for multi-gear downshift timing during passing maneuvers.
Calibration improvement for intermittent delayed upshift.
5.7L gas engine (sales code EZH)
Improved upshift timing in eco, base, and hill modes and while using cruise.
Improved 8-7, 3-2, and 2-1 downshift timing
Improved shift timing at higher altitudes.
Improved torque converter engagement.

Please, let me know if you have any further questions.
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