One problem that can happen with battery cable connectors is corrosion developing on the battery terminals, which can cause the transmission to fail. Most transmissions operate using a computer system that draws its power from the battery. Cleaning or replacing the terminals or cables usually solves this problem.
Corrosion on battery terminals resembles discolored sand, but the material can be cleaned away. Before cleaning, the terminals must be disconnected from the battery one at a time. The proper removal order is the black (negative) post first and then the red (positive) post. Scrubbing the corrosion using a metal wire brush and a baking soda and water paste until the metal posts are shining enables the cable connectors to function correctly.