Transmission does not shift

2003 DODGE DURANGO
205,780 MILES • 4.7L • V8 • 2WD • AUTOMATIC
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FAMOSOKV18
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Vehicle seems to have some serious Transmission problems; it only stays it one gear when you drive it doesn’t up shift and downshift like a regular automatic transmission. I can no longer put it on D to drive I have to use my first or second gear to drive it. Thoughts on what it could be or do I need a transmission rebuild or replacement.
Jun 1, 2022 at 7:55 PM
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STRAILER
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This can be a output or input shaft speed sensor. To be sure we need to scan the computer for codes, this guide can help us find out which. I have also included the location of the sensor in the diagrams below.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Jun 2, 2022 at 2:40 PM
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FAMOSOKV18
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I actually had the computer scan and got the codes P0700, which is transmission control module malfunction and P0750, which is Shift solenoid A malfunction.
Jun 8, 2022 at 9:59 AM
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STRAILER
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Nice work. If you have a P0700 code the module needs to be replaced which can make the solenoid code, go away, but if the solenoid is shorted it can cause the module to think it is bad. I would try the solenoid first because that is most common. Undo the wiring and use a voltmeter to see if there is no resistance or open circuit which means it is bad. Here is a guide to help you with the test:

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Check out the diagrams (below). Please let us know what you find.
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Jun 8, 2022 at 12:21 PM
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FAMOSOKV18
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All right, thanks for the information.
Jun 8, 2022 at 12:23 PM
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STRAILER
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Please let us know what you find. We are interested to see what it is.
Jun 9, 2022 at 6:35 PM