U0101 code after battery change

Question

I have a 2005 Buick Rainier with 5.3L and since I replace the battery I keep getting U0101 code. It started the day the battery was replaced and I replaced the neutral park switch and the problem stopped for two days. Could it be a bad TCM?

Answer 1

Hi there,

This code indicates an issue with the TCM. Here is some info for you.

U0101 BUICK - Lost Communication With Transmission Control Module

Read more: https://www.autocodes.com/u0101_buick.html