Radio draining battery?

2014 GMC TERRAIN
81,000 MILES • V6 • 2WD • AUTOMATIC
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LUVENIA CLARK
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Car wouldn't start and after boosting it started, however my IntelliLink screen went black. I drove to the mechanic and was told the radio was causing the battery to drain even when the radio was off.
Jan 4, 2025 at 8:24 AM
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STRAILER
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It could be a control module not shutting down, did the mechanic do a CAN scan? This is what needs to be done to see what codes are stored. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:


https://youtu.be/u-4syLc-ifQ

Here is a guide that goes over the most popular reasons for the battery to drain down over night:

https://www.2carpros.com/articles/car-battery-dead-overnight

I have seen the Multi-media interference control module go out and cause this, but codes would be better. Please go over these guides and get back to us.
Jan 5, 2025 at 2:48 PM