Transmission at times does not shift from lower ranges

[quote:15d0a42420="linda campbell"]Transmission problem
1993 Dodge Caravan 6 cyl Front Wheel Drive Automatic 102000 miles
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transmission at times does not shift from lower ranges to higher range unless you stop the vechile turn off the engine and after restarting at times it will sfift perfect[/quote:15d0a42420]

Either cases when fuel system or transmission sensors register an anomaly the fuel injection controller (ECU) and or transmission controller will send the tranny to limping-mode.

Possible cause:
Check out for any engine sensor malfunction or look for vaccum leaks they could take controllers to limp-mode as well.
Most likely: and this is my best guess:
1.-Engine got air. (cooling system) purge (bleeding) cooling system, find out air source
2.-Transmission relay is worn out. should be replaced.
3.-Dirt or oil at wiring connectors that is running voltage to transmission solenoids valves from transmission relay.

Likely:
1.-Transmission controller needs software upgrade. (lates firmware)