Weird electrical issue, need your help

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Chriso271

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Hey Y'all. New to the forum. I need help with something, was wondering if anyone has experienced the same thing or if not, is able to pinpoint the cause. I have a video of what occurs but don't know how to or if it can be uploaded. Anyway, here is the issue:

This is an intermittent problem
Generally starts when in the 30 - 45 MPH range (sometimes higher speeds) and involves all of the gauges & idiot lights on the dash panel

The first light & error message & light to come on is always the "Service Air Bag" one, followed by the error message & lights for the traction control, tire pressure monitor & park assist off message. Every gauge will bottom out for a half minute or so then pop back up.This sequence generally repeats itself once, sometimes twice, then typically the service tire monitor light and message comes on and stays on. In addition to that the radio station will sometimes but not always change from XM to AM. Also, occasionally the AC / Fan will get stuck on high speed and can't be turned down or even off. It will only reset when the car is turned off.

Dealer has it has been driving it hooked up to a computer but they can't seem to get it to repeat. They say they checked every connection and tested for a bad ground. They say they can't or won't do anything until they can capture it on the computer. I think it's a bad BCM.
What say ye?

And thanks in advance
 

Chriso271

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Well if anyone's interested they replaced the HVAC module which was locking up. All the gauges & lights run on the same bus. Time will tell but I hope this does it
 

ConfederateTahoe

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I had something similar happen to me on my 00 Silverado. It involved the ABS light, Tach and Speedo, odometer and I believe the Check Engine light.
It ended up being oxidation on the positive terminal of the battery. I cleaned it and everything went back to normal.
 
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