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Using the instructions in this thread you should be able to read the transmission codes that would have been set with the flashing AT Oil Temp light.

The CEL code is probably just a secondary warning light triggered by the TCU. The code could just be one saying that there's a TCU code or codes to look at.

In the event the problem is, for example, a vehicle speed sensor, that would trigger a CEL independently because the ECM also uses the VSS information.

Some transmission codes cannot be read by standard code readers, and this is probably the case with your 2000, which I believe uses the 2-digit transmission trouble codes; but all OBD code readers should be able to read CEL codes.

Start by trying to pull the transmission codes and see what that provides.

Like others, I doubt the problem is in the control modules.
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