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Code U0100?

Tiny
DOUGPARKS567
  • MEMBER
  • 2012 BUICK LA CROSSE
  • AUTOMATIC
  • 120,000 MILES
Hello, I have the car listed above that will not start sometimes and I'm getting a code u0100 ECM lost communication. I wanted to know what the issue could be. I also broke my fob key out of the fob but can still use it to turn the car on and start it when it decides to start, could this be the issue?
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Wednesday, May 24th, 2023 AT 4:46 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,397 POSTS
It sounds like the PCM went out or you have some fuses out. you can get a preprogrammed unit by searching Google or Ebay.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are okay, I would replace the PCM.

Here is a guide to help and the instructions for your car in the images below:

https://www.2carpros.com/articles/how-to-replace-a-vehicles-main-engine-computer-pcm-ecm-ecu

The OBD-II trouble code U0100 stands for "Lost Communication with ECM/PCM."

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.
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Thursday, May 25th, 2023 AT 11:25 AM

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