Voltage fluctuate ???

[Chevy*808*]

Do you guys have problems when your or park or stop vehicle is on idel voltage fluctuate and seem to shake the vehicle ? 2018 Tahoe with only 20k miles

 

[OR VietVet]

Can you shoot a video and post to see the problem?

 

[THarber]

They all do this. Its the ECM controlling the voltage. It freaked me out to but don't worry about it.

 

[Fless]

Depending on how hard the shaking is, I don't thing that it's normal. Whatever is causing the shaking might be causing the voltage swings (low idle speed).

 

[OR VietVet]

They all do this. Its the ECM controlling the voltage. It freaked me out to but don't worry about it.

Post a video to show this please.

 

[tom3]

Any chance that's the AC compressor or the cooling fans kicking on and off? Our 2019 is rock steady at idle - so far.

 

[Scoots]

is that the extremely loud noise?
The AC on and off doesnt seem to make much noise but the fans Wholly Shit

 

[Chevy*808*]

Update *
Figured out why my truck was vibrating at stop light / idel . Sprak plug #7 was crack . Wired it only flash once check engine light but it didn’t stay on .took out the speed engineering plugs swap it with MSD it running 100x better no rough idle / vibration