Static noise from speakers when 2018 GMC sierra is on, NO sound at all

zachdill5 · December 22, 2021

Hi I am new here so I'm not sure if I'm posting this in the correct spot, but I'm having big electrical problems with my 2018 GMC Sierra 1500. it started about 1.5 weeks ago, I turned my truck on one cold morning(-15C) and my speakers were making crackling noises with no music coming out at all, no door chimes or signals either. I noticed my volts were around 15.5-16, but it never went over 16. the music would come back on when I turned the engine off and just had it on ACC mode. I called my mechanic and he told me it was probably my alternator, so I paid to Get that replaced, he returned it and nothing changed. still having the exact same problems. I called him again and he took it back in and looked at it some more. The speakers now crackle for the first 5ish minutes of the vehicle turning on, and then eventually smooth out as the volts settle down to around 14.3V. I put in all new speakers around the truck about 6 months ago, with an Amp and subwoofer, but I am just now experiencing problems with it. I tried taking the power cable off of the amp, and its still doing it to the door speakers and tweeters. I am now out $1100 and still having this issue, if ANYONE could give me some advice or something I could try that would be awesome,

Thanks!

Supreme Pizza · December 22, 2021

My 2008 has an aftermarket stereo, so I had to use a special adapter module, so that the truck can "talk" to the stereo. Its not like the old school stereo systems that just needed power, ground, and speakers. I would assume that one of the aftermarket or OEM stereo electrical boxes on your rig is defective. You may want to make sure that none of your speaker wires are shorted, or maybe fell off one of the speakers. As for the alternator, I would take it back and ask him to replace it with the original one. He is the one that suggested that the part was bad, and he was wrong. So why should you have to pay for his incompetence? Once he installed it and found that the problem was still there, then he should have removed it right then and there before even giving the truck back.

m3n00b · December 22, 2021

Did you have the Bose system? You may need to cut the wires for the anc

zachdill5 · December 22, 2021

6 minutes ago, m3n00b said:

Did you have the Bose system? You may need to cut the wires for the anc

I did not have the Bose system

zachdill5 · December 22, 2021

38 minutes ago, Supreme Pizza said:

My 2008 has an aftermarket stereo, so I had to use a special adapter module, so that the truck can "talk" to the stereo. Its not like the old school stereo systems that just needed power, ground, and speakers. I would assume that one of the aftermarket or OEM stereo electrical boxes on your rig is defective. You may want to make sure that none of your speaker wires are shorted, or maybe fell off one of the speakers. As for the alternator, I would take it back and ask him to replace it with the original one. He is the one that suggested that the part was bad, and he was wrong. So why should you have to pay for his incompetence? Once he installed it and found that the problem was still there, then he should have removed it right then and there before even giving the truck back.

Hmmmm i just noticed that my back right speaker has no audio coming out of it, i’ll take the panel off and investigate that, thank you!

Supreme Pizza · December 22, 2021

Keep us posted, when you find the problem - let us know how it works out. People read these old forum posts years later, so it may help someone "down the road" as it were.

zachdill5 · December 23, 2021

UPDATE:

I took off the door panel, checked the rear passenger speaker to see if the wires were shorting out, but everything was connected fine. It had no power going to those wires though. I went and got my battery tested at Canadian Tire and they said its a good battery. My mechanic is now thinking its the Head unit, and I know how expensive those are so I'm really hoping its not.