I don't know if this will help, but it may. I was hours into a long trip when my 95 New Yorker suddenly downshifted on the highway. Lucky no one was behind me. I had no sooner pulled over to the shoulder than someone pulled over to assist. He was an Auto Zone employee and told me that my problem was likely a sensor. His recommendation was to disconnect the battery for a few minutes (2-5) and the computer would reset itself. I did that and I was on my way. No problems since, and it's been less than 2 weeks.
Before my return, I put it in the shop to have it checked out. The mechanic said that unless the "check engine" light came on, there would be no trouble code they could get off the computer. When that happened, the check engine light didn't come on, neither did the "overdrive" light. I have no idea what happened and my mechanic said he just drive it.
If you have a check engine light on, you might go to Auto Zone if you live near one. They'll hook your car up to the diagnostic computer for little or no charge so that you can see what trouble code is showing.
Transmission in need of SERVICE.
That happens when the transmission computer detects a malfunction and sets a code. It defaults to safe mode which is second gear. You need to have the codes read.
check your transmission control relay.. it might be stuck..
When the computer detects a malfunction it will default into second gear only. Check the codes and that will give you an idea of causes.
your transmission is out. your transmission is out.
Take it to a service shop and have the trans checked for codes.
Most likely the computer has detected a malfunction and set a code. Have the system checked for codes.
The transmission computer defaults to second gear when it detects a malfunction and sets a code. You need to have the system checked with a scan tool to know possible causes.
Shift cable has unhooked, fluid too low, transmission failed.Shift cable has unhooked, fluid too low, transmission failed.
You need to have the computer checked for codes. That will tell you what area the problem is in. It can be wiring, computer, or even an issue with the new transmission.
Several things can cause your transmission to be stuck in second gear. Broken or detached shifting linkage will cause the problem. A broken shifting for in the transmission can also cause the problem.
Switch on the side of the transmission was bad. Possible output speed sensor, it is on the left side of the transmission towards the rear. Two wires in the connecter.