This solenoid helps optimize the shifting to the best gear to match driver needs and maximize fuel economy.
This will cause the issues you are seeing so we need to run through the testing below to determine what the issue is. It could be a harness/wiring issue or even the TCM so we need to narrow this down.
Here is a guide that will help with this testing:
Please run through this testing and let us know what questions you have.
Images (Click to enlarge)
Friday, June 11th, 2021 AT 3:27 PM