Can this be the ECM? there was a loud pop?

2016 CHEVROLET SILVERADO
40,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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SMURRAY8
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When you put the key in the ignition and turned to start, there was a loud pop and then all of the lights, and dash lights were flickering. Checked the battery, cables etc., all are correct readings. Tried to start again, loud clunk and flickering of lights. I hooked up the Foxwell, and the only thing coming up is the ECM. Any ideas other than the ECM?
Oct 1, 2024 at 4:18 PM
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STRAILER
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Did you load test the battery? What code number does it have? Also, can you upload a short video of the noise it is making now; it sounds like the battery might be ready to be replaced. I would remove it and take it to the auto parts store for testing.

Here is how:

https://youtu.be/qXTpXyv5T1I?si=wnHUfSAHOkCMl0zO

Please go over this guide and get back to us.
Oct 2, 2024 at 11:14 AM
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SMURRAY8
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Did the load test, and it failed. Thanks for the help. It was definitely the battery. Replaced it, and it works like a dream.
Oct 4, 2024 at 12:51 PM
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STRAILER
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Oct 5, 2024 at 9:01 AM