Multisystem electrical failure?

HAYDENRICCA

MEMBER
2005 CHEVROLET TAHOE
232,000 MILES

I have a 2005 4.8L Tahoe. Simultaneously my oil/fuel/engine temperature/ and voltage gauges stopped working, AC stopped blowing cold, lock/unlock and power windows failed. I have a brand-new battery and alternator in it. I am frustrated and stuck. What could be going on?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

Hello,

This sounds like the body control module has gone out, but we should check the fuses before replacing the BCM. Here are the fuse locations for the BCM and a guide to help check them and if they are okay, you can get a preprogrammed unit by searching Google or Ebay so the job will be easy.

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

Please check the fuses in the fuse panel on the left side of the dash and the fuses in the panel under the hood with the key on. If these fuses are okay, I have included how to change the BCM out to fix the problem. Also, there is a ground for the BCM I have included as well along with the BCM wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens.

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Thursday, February 23rd, 2023 AT 10:46 AM

HAYDENRICCA

MEMBER
2 POSTS

I checked the ground wire underneath pillar A at the top left of dashboard. It was very tight and sturdy. I also carefully checked the fuses, and they are as they should be. Do you think it is 100% the BCM or should I really do an in-depth check of that ground? Thank you so much.

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Thursday, February 23rd, 2023 AT 1:44 PM

KEN L

MASTER CERTIFIED MECHANIC
47,602 POSTS

If the ground is in good condition, you should be okay but if you want to check the power and grounds of all circuits to the BCM this guide can help along with the BCM wiring diagrams above to help confirm the failure before you order one.

https://www.2carpros.com/articles/how-to-check-wiring

Please let me know

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Friday, February 24th, 2023 AT 11:53 AM