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Discussion Starter #1
I have a 2009 Unlimited X 2WD. When I put it in reverse and start backing up it kind of "shudders" a little bit. It goes away after a few feet. What could cause this. It has 33x11.50 tires all around.
 

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Does it do it only when after a cold start up? When it's raining (or humid out)? Does it do it if you put in reverse, drive a bit and then go back in to reverse?
 

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Discussion Starter #4
Automatic Transmission. I drive it home from work (about 7 miles) pull up in front of my house, put in reverse and back into the driveway. Every time I back up, it does this, I am backing in on an arc and not straight. I will have to pay attention next time, but I don't think it does it when I back straight.
 

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This issue is actually too common with early JK's. There's an 08 TSB to address this as a problem with forward gears, but it also affects reverse gear. It could be a simple programming fix or a more involved torque converter issue:

NUMBER: 21-001-08 REV. B GROUP: Transmission
DATE: February 15, 2008
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 21-001-08 REV. A, DATED JANUARY 15, 2008, WHICH SHOULD BE REMOVED FROM YOUR FILES. THIS IS A COMPLETE REVISION AND NO ASTERISKS HAVE BEEN USED TO HIGHLIGHT REVISIONS.
NEW SOFTWARE HAS BEEN ADDED FOR THE JK MODELS.
THE StarSCAN® FLASH FILES FOR THIS BULLETIN MUST BE RETRIEVED FROM THE INTERNET.
StarSCAN® SOFTWARE LEVEL MUST BE AT RELEASE 8.04 OR HIGHER.
StarMOBILE DESKTOP CLIENT MAY ALSO BE USED TO PERFORM THIS PROCEDURE. StarMOBILE STANDALONE MODE MAY ALSO BE USED TO PERFORM THE FLASH.
SUBJECT:
Flash: Torque Converter Shudder Or 1-2, 2-3 or 3-4 Upshift Bumps
OVERVIEW:
This bulletin involves reprogramming the Powertrain Control Module (PCM) with new software and replacing the torque converter as required.
MODELS:
2007 (JK) Wrangler
NOTE: This bulletin applies to JK models built with a 42RLE automatic transmission (Sales Codes DFF, DGV, or DG2).
SYMPTOM/CONDITION:
The vehicle operator may experience one or more of the following symptoms:
1. Transmission Shudder - (42RLE)
a. This condition can only occur after the vehicle has been driven and the torque
convertor is past the break in period. Torque Converter break in can be confirmed with the StarSCAN®.
This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of Chrysler LLC.

21-001-08 REV. B -2-
b. If experienced, the shudder may occur when the transmission temperature is between 38° C and 54° C (100° F and 130° F) during steady state driving with the torque convertor in partial lock (EMCC) operation. The shudder feels like the vehicle is being driven over rumble strips.
2. 1-2, 2-3 or 3-4 Upshift bumps
DIAGNOSIS:
Using a Scan Tool (StarSCAN®) with the appropriate Diagnostic Procedures available in TechCONNECT, verify all engine/transmission systems are functioning as designed. If DTC's are present record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the vehicle operator describes the Symptom/Conditions and they can be verified, perform the appropriate Repair Procedure.
PARTS REQUIRED:
SPECIAL TOOLS / EQUIPMENT REQUIRED:
Qty.
Part No.
Description
1
04275086AB
Label, Authorized Modification
1
05093944AB
Kit, Torque Converter - (42RLE) w/revised friction (EMCC1) material
NPN
Battery Charger
CH9401
StarSCAN® Tool
CH9404D
StarSCAN® Vehicle Cable
CH9409
StarSCAN® Documentation Kit
CH9410
StarSCAN® Ethernet Cable, 12 ft.
CH9412
StarSCAN® Software Update Device Kit
TechCONNECT PC or equivalent
REPAIR PROCEDURE - USING THE INTERNET TO RETRIEVE THE FLASH FILE:
1. Does vehicle exhibit torque converter shudder with or without a 1-2, 2-3 or 3-4 Upshift Improvements?
a. Yes >>> Proceed to Step #3.
b. No >>> Proceed to Step #2 .
2. Reprogram the PCM only with the latest software using the flash procedure listed in
the flash procedure below. Replacing the Torque Converter is not necessary if the
vehicle only has the 1-2, 2-3 or 3-4 Upshift Improvements.
3. Replace the Torque Converter (p/n 05093944AB) - Follow detailed service procedures
listed in DealerCONNECT>TechCONNECT for Torque Converter replacement.
NOTE: The PCM must be flash reprogrammed with new software when a new torque converter is installed on the vehicle.
-3- 21-001-08 REV. B
4. Reprogram the PCM with the latest software. Follow the detailed service procedures available in DealerCONNECT/TECHCONNECT, Refer To 8 - Electrical/Electronic Control Modules/Powertrain Control Module - Standard Procedure PCM/ECM Programming - Gas. After PCM reprogramming, the following must be performed:
a. Clear the Variable Line Pressure (VLP) Counters, found in the StarSCAN® Misc
Function Menu. VLP Clear Counters must be completed on all models with a 42RLE
transmission.
b. Clear any DTC's that may have been set in other modules due to reprogramming.
c. Perform the Quick Learn function, found in the StarSCAN® Misc Function Menu.
5. Type the necessary information on the “Authorized Modification Label” p/n 04275086AB and attach it near the VECI label.
POLICY:
Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No:
Description
Amount
21-33-01-93
Torque Converter, Transmission - Replace, PCM - Reprogram - 42RLE Equipped Vehicles (B)
2.5 Hrs.
21-33-01-96
Torque Converter, Transmission - Replace, PCM - Reprogram - 42RLE 4X4 Equipped Vehicles (B)
5.1 Hrs.
18-19-06-96
Module, Powertrain Control Module (PCM) - Reprogram - ONLY (B)
0.4 Hrs.
FAILURE CODE:
ZZ
Service Action
 

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Discussion Starter #6
Thanks for this !! I will have them check it when they replace the Passenger Airbag on Recall next week.
 

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My 2017 Jk is at the dealer right now for the "shudder" when releasing the clutch in 1st gear and reverse. They are telling me there is nothing wrong with it because they cannot duplicate the issue when they are driving it. Could the above be the issue even though its a 2017?
 

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forgot to mention......

Other people in the front and rear seats have felt it as well. It was not low rpm's and my driveway is at an incline and I do reverse into my driveway as well. Thanks!
 

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My 2017 Jk is at the dealer right now for the "shudder" when releasing the clutch in 1st gear and reverse. They are telling me there is nothing wrong with it because they cannot duplicate the issue when they are driving it. Could the above be the issue even though its a 2017?
The above TSB is for an auto trans. A manual trans JK can have an issue as you described when the weather is damp and wet, until it dries. If it happens when the clutch and flywheel are completely dry then there's probably an issue.
 

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If you do not come up with an answer to your problem---just for shts & giggles---remove all your brake pads and taper leading and trailing edges slightly.
 

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My 2017 Jk is at the dealer right now for the "shudder" when releasing the clutch in 1st gear and reverse. They are telling me there is nothing wrong with it because they cannot duplicate the issue when they are driving it. Could the above be the issue even though its a 2017?
Hi DARRREN,

Keep us updated on your dealer visit. If you decide you'd like to get a second opinion, let us know. We're available via direct message and would be glad to get this over to a Case Specialist for further handling.

Jasmine
Jeep Social Care Specialist
 
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