Hummer Electrical Gremlins

[jsbihn]

Ok, so I have the famous Hummer H2 electrical gremlins.
I have a speedo that will peg itself out on but then after a few days will restart.
I have a drivers side door that will not lock when the rest do, but again in a few days it starts to work again.
I have a trans gauge (lower farthest left side of the cluster) that will just not work and then work again.
and so on....

Just wondering if anyone has figured out a fix for this?
Like it is a surge that knocks them out and then lets them come back to normal?
Is there a low level signal?
I have a cheap obdII code reader and the torque app on my phone and every time I get no codes.
Of code i know that torque and the 20 dollar reader isnt exact and covers all the codes that might be in there, but still....

at this point everything has fixed itself, but I am trying to make sure that I can see about fixing it before it happens again
thanks