have a 2000 dodge,that will not shift into o/d. scanner shows -27*f.changed temp sender and now shows -47*f. with my scanner i can make it shift into o/d. Seems that i must have a wiring issue.I can't find any diagrams to help me out. any help would be thankfull for any help.

 

If the 3-4 upshift occurs immediately after 2-3 shift..possible causes include overdrive solenoid connector or wiring shorted, TPS malfunction, PCM malfunction o/d switch/button or valve body solenoid malfunction..think you can download the hanes manual in the DIY section here for the wiring diagram