Windstar Transmission Problems

Sounds like your transmission control module is acting up. If the brain is telling the body (transmission) what to do, and the brain is scrambled, the body won't respond correctly. Are you sure the wiring harness to the TCM is okay? Sometimes a loose connection can mimic a failing module.

That's an interesting analogy. Thanks. Regarding the wiring harness, is there a specific area I should be inspecting, or a diagnostic procedure to confirm its integrity?

Honestly, without proper diagnostic tools, it's tough to pinpoint the exact spot. The harness could be chafed anywhere between the TCM and the transmission. I'd hate for you to chase a ghost. With those symptoms and error codes, combined with the mileage, it really does sound like the TCM itself is the culprit. Best bet is to take it to a reputable shop that specializes in transmissions.

I appreciate the confirmation. I took your advice and brought it to a transmission specialist. They confirmed it was indeed the transmission control unit. The total repair cost came to approximately 1000€ Thank you for your time and assistance.