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Discussion Starter · #1 ·
If I have the EB switch on, sometimes if I let off the throttle around 30mph or slower, I get this HUGE lurch just before the EB comes on. Like, huge, snap-your-head-back lurch. Literally I thought I had been rear-ended the first time it happened but there was nobody close behind me. I was not in tow/haul mode. It doesn't happen every time but often enough. I took it to the dealer thinking maybe I needed some program flash update, but they said this was normal operation of the EB. I find that hard to believe. The EB doesn't do this at higher speeds or all the time even slow. Do any of you guys have this happening? Is it normal? Is there anything can be done about it? Thanks.
 

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i dont think its normal mine has never done it in tow haul it will kick in hard sometimes but nothing like your saying maybe someone else will chime in
 

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That's normal, the tranny is in 1st or second and you left off the accelerator; the tranny stays in the gear and the EB comes one. The EB is a brake but does not have the same force as the break pads and has the gear slop of the drive train, the slop gives you the jerk. So long as its above 25 mph the EB comes one. The same thing will happen if you down shift with the rocker switch as you slow down from higher speeds.
 

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He doesn't like the lurch at 30 right? Turn off the EB at low speed :doh:
Oh, :rof pretty good, sorry old guy hear. Either that or don't let up on the accelerator quickly at low speeds.... just push it down and roll over what ever is in the way.
 

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No, it's not normal. There is a TSB for it. They were gonna do the TCM flash for mine but it only does it when it's cold & they "could not duplicate" of course.
 

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No, it's not normal. There is a TSB for it. They were gonna do the TCM flash for mine but it only does it when it's cold & they "could not duplicate" of course.
Do you know if that is in the most recent flash update?
 

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As soon as I got my TCM tune from MHP, no more lurch with EB. It is really a gear shifting problem not and EB problem.
 

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As soon as I got my TCM tune from MHP, no more lurch with EB. It is really a gear shifting problem not and EB problem.
Correct, that is why it's a flash for the TCM & not the ECM. It may be normal but it is NOT right. To answer the other question, no an ECM flash will not fix it. It is a specific flash for your tranny.
 

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Discussion Starter · #14 ·
LFD2037, you wouldn't happen to know the TSB number for that would you? I think you're right, it may be a common problem but I can't believe it's supposed to do that. I mean, at other speeds sure there is a little bit of lurch when the EB kicks in, but this one is before the EB engages -- in that little moment between letting off the throttle and hearing the EB start -- and like I said, it's SEVERE. I doubt that Dodge would say it's ok to have to check whether someone has just slammed into your back bumper if it's only "normal EB operation".
 

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I don't remember the flash but you can search on here & find it.
 

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Mine has done it since new! I have found that if I leave my EB off till the truck warms up it does not do it! BUT thats just what works for me......
 

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Here it is.

DodgeRam.info > TSB's > 21-019-07

TSB 21-019-07
FLASH: 68RFE Transmission - Harsh Coastdown Shift And/Or Harsh 2-3 Upshift
Visit Geno's Garage
for Truck accessories.


--------------------------------------------------------------------------------

Date: November 14, 2007

Models: 2007 - 2008 (D1/DH) Ram Truck

NOTE: This bulletin applies to vehicles equipped with a 68RFE automatic
transmission (sale code DG7) built on or before November 06, 2007 (MDH
1106XX).

THE StarSCAN FLASH FILES FOR THIS BULLETIN ARE AVAILABLE VIA THE INTERNET.

Overview:
This bulletin involves selectively erasing and reprogramming the Transmission Control
Module (TCM) with new software.

Symptom/Condition:
The customer may experience a harsh downshift from the transmission when coming to a
stop. When a vehicle stop is initiated from 4th gear (around 40 Km/h or 25 MPH), the
harsh downshift condition will usually occur as the vehicle decelerates to a speed of about
16 Km/h (10 MPH) . If the transmission is in 2nd, 3rd, 5th, or 6th gear, when the stop is
initiated, the condition will not be present. This may cause the condition to appear to be
intermittent to the customer. Because the harsh downshift may occur below 16 Km/h (10 MPH),
the customer may believe that they are experiencing a harsh 2 - 1 downshift.

Some customers may also experience a harsh 2-3 upshift during normal acceleration.
This symptom is less common than the harsh coastdown shift.

Diagnosis:
1. Using a StarSCAN with the appropriate Diagnostic Procedures available in
TechCONNECT, verify all engine systems are functioning as designed. If DTCs are
present record them on the repair order and repair as necessary before proceeding
further with this bulletin.
2. If the vehicle operator describes or experiences the Symptom/Condition, perform
the Repair Procedure.


Parts Required: Qty. Part No. Description
1 04275086AB Label, Authorized Modification


Special Tools/Equipment Required:

NPN Battery Charger
CH9401 StarSCAN® Tool
CH9404 StarSCAN® Vehicle Cable
CH9409 StarSCAN® Documentation Kit
CH9410 StarSCAN® Ethernet Cable, 12 ft.
CH9412 StarSCAN® Software Update Device Kit
TechCONNECT PC or equivalent
Latest StarSCAN® Software Update CD

Repair Procedure:

REPAIR PROCEDURE - USING THE INTERNET TO RETRIEVE THE FLASH FILE:

NOTE: Before performing this Repair Procedure, the operating software in the StarSCAN
must be programmed with software release level 8.03 or higher. The software release level
is visible in the blue header at the top of the StarSCAN screen.

NOTE: The StarSCAN diagnostic scan tool fully supports Internet connectivity. However,
in order to take advantage of this feature you must first configure the StarSCAN for your
dealership's network. Make sure the StarSCAN is configured to the dealership's network.
For instruction on setting up your StarSCAN for the dealer's network; refer to the StarSCAN
Quick Start Networking Guide is also available on the www.dcctools.com website under
the "Download Center".

NOTE: If this flash process is interrupted/aborted, the flash should be restarted. 1. Open the hood and install a battery charger. Using a voltmeter, verify that the charging
rate provides 13.2 - 13.5 volts. Set the battery charger to continuous charge. Do not
allow the charger to time out during the flash process. Remove the charger from the
battery when the flash process is complete.
NOTE: Do not allow the charging voltage to climb above 13.5 volts during the flash process.
2. Connect the CH9410 StarSCAN ethernet cable to the StarSCAN and the dealer's network drop.
3. Connect the CH9404 StarSCAN vehicle cable to the StarSCAN and the vehicle.
4. Place the ignition switch in the "RUN"' position. Do not start engine.
5. Power ON the StarSCAN.
6. Retrieve the old ECU (TCM) part number. Using the StarSCAN at the "Home" screen:
a. Select "ECU View"
b. Touch the screen to highlight the TCM in the list of modules.
c. Select "More Options".
d. Select "ECU Flash".
e. Record the part number at the top of the "Flash PCM" screen for later reference.
f. Select "Browse for New File". Follow the on screen instructions.
g. Select "Download to Scantool".
h. Select "Close" after the download is complete, then select "Back".
i. Highlight the listed calibration.
j. Select "Update Controller".
k. When TCM update is complete, select "OK".
7. Clear all DTC's from the vehicle electronic modules.
NOTE: Due to the TCM programming procedure, a DTC may be set in other
modules within the vehicle. Some DTC's may cause the MIL to illuminate.
From the "Home" screen select "System View,". Then select "All DTCS". Press
"Clear All Stored DTCS" if there are any DTCs shown on the list.
8. Using the StarSCAN, perform a transmission "Quick Learn" procedure
prior to returning the vehicle to the customer.
NOTE: A "Quick Learn" must be performed.
NOTE- The following step is required by law when reprogramming a PCM and/or TCM.
9. Type the necessary information on the "Authorized Modification Label" p/n 04275086AB and attach near the VECI label (Fig. 1).

FIGURE 1 - AUTHORIZED MODIFICATION LABEL







Policy: Reimbursable within the provisions of the warranty.





This page was edited on: February 28, 2008
 
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