2000 Dodge Caravan Codes from test

2000 DODGE CARAVAN
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RUSS N WENDY
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Transmission problem
2000 Dodge Caravan Front Wheel Drive Automatic 118,00 miles

My engine light came on a couple of days ago and when Russ went to have it tested at Checker the codes came back -

aa Transaxle control system fault

aaECM received a signal that the transaxle control aamodule has a fault

probable cause:

aa1 shorted or open circuit withing transaxle

aa2 failure of transaxle control module

They said maybe a wire had been chewed? We did have a desert rat's next in the car a few months ago, but didn't notice anything then. Russ changes out a lot of parts in the cars, has never done anything with that. How hard of a repair is this?
Nov 25, 2009 at 4:33 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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