NUMBER: 21-018-08 REV. A
DATE: September 17, 2008
Flash: Diagnostic Trouble Code DTC P0740 Or P1798 And Automatic Transmission Shift Improvements 1-2 Or 2-3 Cold Shift Improvements
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).
This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM).
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.