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
MODEL:
2007 – 2008 (JK) Wrangler
NOTE: This Bulletin applies to LX/LE models equipped with a 42 RLE transmission (Sales Code DGV) built before April 28, 2008 (0428XXMDH). This Bulletin applies to all 2008 KA/KK/HB/DR and 2007 – 2008 **JK**/ND vehicles equipped with a 42 RLE transmission (Sales Code DGV).
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
Do not confuse this condition for an Oil Change Monitor alert due to the Oil Change Monitor not being reset following an oil change.
Does this include the 6 speed standard transmission?
I don’t think so.
My 2006 Jeep slips when cold from 1st to 2nd. It didnt do it all in the winter but started again last month
To clarify the Jeep will slip into gear (1st -2nd) after every start up. After 2 miles or so there are no issues. The issue disappeared for about 4 months over the winter but is now reoccurring. 73k miles on the Jeep
This sounds similar to the TSB NUMBER: 21-018-08 REV. A
Any information is appreciated.