View Poll Results: Have you had your Auto Trans Re-Programed?
Why bother, I am trading it off for a 6-speed altogether!
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Have you had your Auto Trans Re-Programmed?
02-20-2009, 08:05 AM
#1
JK Freak
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Have you had your Auto Trans Re-Programmed?
Hello All,
I have been experiencing some odd shift patterns and poor shift control in my 08 Unlimited with Auto & 3.73's.
I have scheduled a "ride along" with a dealer tech next week to showcase the abnormalities and I was wondering if anyone else has experiance with TSB 21-018-08 REV. A, and if so, or any other re-programming; what were your findings?
I have heard some Dodge Nitro owners with the 42RLE 4-speed transmission have had some success with it.
What I have noticed:
- Very quick to upshift to 4th/OD even while uphill and attempting to accelerate (while depressing accelerator), this causes a massive downshift when system hits a threshold of <1000 rpm and once the pedal is on the floor.
- Attempting to run in 3rd only by activating the "OD OFF" button does not function, trans will still try to force 4th/OD with button on. (not fun with a full load of people in hilly area)
- Attempting to force run in "2nd" with gear selector in "2nd" will not function, transmission will continue to upshift to 4th/OD and downshift quickly. (causeing overheating concerns.)
**I should note that these conditions are nowhere near as noticeable when I am on flat, straight road with no hills, or not hauling/towing.**
I have been experiencing some odd shift patterns and poor shift control in my 08 Unlimited with Auto & 3.73's.
I have scheduled a "ride along" with a dealer tech next week to showcase the abnormalities and I was wondering if anyone else has experiance with TSB 21-018-08 REV. A, and if so, or any other re-programming; what were your findings?
I have heard some Dodge Nitro owners with the 42RLE 4-speed transmission have had some success with it.
What I have noticed:
- Very quick to upshift to 4th/OD even while uphill and attempting to accelerate (while depressing accelerator), this causes a massive downshift when system hits a threshold of <1000 rpm and once the pedal is on the floor.
- Attempting to run in 3rd only by activating the "OD OFF" button does not function, trans will still try to force 4th/OD with button on. (not fun with a full load of people in hilly area)
- Attempting to force run in "2nd" with gear selector in "2nd" will not function, transmission will continue to upshift to 4th/OD and downshift quickly. (causeing overheating concerns.)
**I should note that these conditions are nowhere near as noticeable when I am on flat, straight road with no hills, or not hauling/towing.**
Last edited by Matt08jk; 02-20-2009 at 09:04 AM.
02-20-2009, 08:14 AM
#2
JK Freak
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Tsb 21-018-08 rev a.
NUMBER: 21-018-08 REV. A
GROUP: Transmission
DATE: September 17, 2008
SUBJECT:
Flash: Diagnostic Trouble Code DTC P0740 Or P1798 And Automatic Transmission Shift
Improvements 1-2 Or 2-3 Cold Shift Improvements
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM).
SYMPTOM/CONDITION:
The software contains the following improvements:
· 2008 LX 3.5L 1-2 Shift Improvements
· Cold (Transmission Fluid below 80° F) 2-3 Shift Improvements
Some customers may experience one or more of the concerns as follows:
· A MIL illumination for P0740 - Torque Converter Clutch Circuit/Open
· A DTC set active or stored for P1798 - Transmission Fluid Deteriorated
GROUP: Transmission
DATE: September 17, 2008
SUBJECT:
Flash: Diagnostic Trouble Code DTC P0740 Or P1798 And Automatic Transmission Shift
Improvements 1-2 Or 2-3 Cold Shift Improvements
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM).
SYMPTOM/CONDITION:
The software contains the following improvements:
· 2008 LX 3.5L 1-2 Shift Improvements
· Cold (Transmission Fluid below 80° F) 2-3 Shift Improvements
Some customers may experience one or more of the concerns as follows:
· A MIL illumination for P0740 - Torque Converter Clutch Circuit/Open
· A DTC set active or stored for P1798 - Transmission Fluid Deteriorated
02-20-2009, 12:43 PM
#4
JK Enthusiast
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"- Attempting to run in 3rd only by activating the "OD OFF" button does not function, trans will still try to force 4th/OD with button on. (not fun with a full load of people in hilly area)"
That's what I do. I flip the OD button on whenever I enter the hills and drive my 3-speed. Sounds like your OD momentary switch is not functioning correctly.
That's what I do. I flip the OD button on whenever I enter the hills and drive my 3-speed. Sounds like your OD momentary switch is not functioning correctly.
02-20-2009, 01:43 PM
#5
JK Super Freak
Join Date: Apr 2007
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NUMBER: 21-018-08 REV. A
GROUP: Transmission
DATE: September 17, 2008
SUBJECT:
Flash: Diagnostic Trouble Code DTC P0740 Or P1798 And Automatic Transmission Shift
Improvements 1-2 Or 2-3 Cold Shift Improvements
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM).
SYMPTOM/CONDITION:
The software contains the following improvements:
· 2008 LX 3.5L 1-2 Shift Improvements
· Cold (Transmission Fluid below 80° F) 2-3 Shift Improvements
Some customers may experience one or more of the concerns as follows:
· A MIL illumination for P0740 - Torque Converter Clutch Circuit/Open
· A DTC set active or stored for P1798 - Transmission Fluid Deteriorated
GROUP: Transmission
DATE: September 17, 2008
SUBJECT:
Flash: Diagnostic Trouble Code DTC P0740 Or P1798 And Automatic Transmission Shift
Improvements 1-2 Or 2-3 Cold Shift Improvements
OVERVIEW:
This bulletin involves selectively erasing and reprogramming the Powertrain Control
Module (PCM).
SYMPTOM/CONDITION:
The software contains the following improvements:
· 2008 LX 3.5L 1-2 Shift Improvements
· Cold (Transmission Fluid below 80° F) 2-3 Shift Improvements
Some customers may experience one or more of the concerns as follows:
· A MIL illumination for P0740 - Torque Converter Clutch Circuit/Open
· A DTC set active or stored for P1798 - Transmission Fluid Deteriorated
I've been noticing issues with 2-3 upshifts when the trans is cold in my 07 that I don't recall having last winter
02-20-2009, 02:33 PM
#6
JK Freak
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http://project-jk.com/jeep-jk-tsb-re...smission-shift
02-20-2009, 02:48 PM
#7
JK Super Freak
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I looks to apply to selected 2007 & 2008 JK's;
http://project-jk.com/jeep-jk-tsb-re...smission-shift
http://project-jk.com/jeep-jk-tsb-re...smission-shift
And I'll take a copy of that TSB with me
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03-01-2009, 09:15 AM
#10
I had my Auto Trans reprogrammed under TSB 21-001-08 REV. B for the Torque Converter Shudder and it seems to have helped.
I also had them flash the tires from the stock size (245/75/16) to the Rubi Size (255/75/17) and also noticed a difference in the shifting points of the transmission. Seems like I have more power now and I don't have to press as hard to accelerate when going up hills.
I also had them flash the tires from the stock size (245/75/16) to the Rubi Size (255/75/17) and also noticed a difference in the shifting points of the transmission. Seems like I have more power now and I don't have to press as hard to accelerate when going up hills.