[snip]

sounds like the transmission went into what's
called "limp home mode". That happens when
a whole bunch of possible things go wrong,
so it locks itself into second gear so that
you can get off the highway and, well, limp
to a repair shop.

Sometimes these things are a momentary hiccup,
which, once they reset, are a-ok for the duration.

Other times, though....

There are lots of diagnostics to check out
what happened. They might, or might not,
give you the answer...



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