[Skyman59]

My 2013 Denali just started acting up with the key fob intermittently not working. When I open the door with the key, the horn honks until I start it. When I enter and start it this way, I get electrical malfunctions: The HUD won't work, the radio won't work, the heated seats won't work, I get an airbag service warning and only the rear locks work. If I shut it off and restart, everything works fine. Key fob batteries were replaced with no change. Confusing...

 

[JayTee2019]

My 2013 Denali just started acting up with the key fob intermittently not working. When I open the door with the key, the horn honks until I start it. When I enter and start it this way, I get electrical malfunctions: The HUD won't work, the radio won't work, the heated seats won't work, I get an airbag service warning and only the rear locks work. If I shut it off and restart, everything works fine. Key fob batteries were replaced with no change. Confusing...

Difficult to diagnose and say online like this.
Possibly a malfunction with the security alarm feature.
Or a fuse box or communication module error. Frayed wires.. .. corrosion in a fuse box or faulty relay, etc.

A trip to the service department with competent techs might be best in this case.

 

[GEORGEC]

Do you have a second key fob? If so does using it get the same results?

gmc