HVAC Control Panel intermittently has no power?

MACHINIST1

MEMBER
2015 CHEVROLET SILVERADO
5.7L
V8
2WD
AUTOMATIC
35,000 MILES

I bought the truck new and since I got it the control panel for the ac has intermittently had no power, usually when the interior of the truck is hot. This happened once or twice a year initially. Recently it has had this issue more often and when the interior isn't really hot. Recently the radio speakers also work intermittently and the volume changes. With the speakers, the issue is that some of them stop working, but not all and the speakers that are working will intermittently come on, but one of the others will go off when that happens, and this only happens when the A/C control is also not working.

The A/C is operational at the last setting when the controls are off. This is the A/C still works and the fan blows etc, but I can't control the system.

Any information would be greatly appreciated.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,416 POSTS

This can happen when the info display module is going out, but to be sure you can do a CAN scan which is easy which should produce a trouble code. 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. Here is how to replace the info display module in the images below.

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

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here are the HVAC wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what happens. You can get a preprogrammed unit by searching Google or Ebay, have your VIN number ready.

Images (Click to make bigger)