I have a code of U1064

FAW484

MEMBER
2003 CHEVROLET IMPALA
92,000 MILES

I have a code of U1064 ( Loss of Communication) Can you tell me what exactually this means. And how to fix it? I ve read that alot of BCM, s have been replaced needlessly. My security light is on. And also I have a code of B3128 and my door lock fuse keeps blowing.

2 Replies

WRENCHTECH

MECHANIC
20,757 POSTS

The U1064 indicates a communication error between the BCM and the PCM which would have to be investigated further.

The B3128 is a problem in the door lock circuit somewhere

CONDITIONS FOR SETTING THE DTC
The BCM detects a short to voltage on the door lock actuator lock control circuit, door lock actuator unlock control circuit or driver door lock actuator unlock control circuit for greater than 150 milliseconds.