TSB - Flash: Diagnostic Trouble Code DTC P0740 Or P1798 And Automatic Transmission Shift
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.
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