Wierd 2001 Silverado cluster issue

[gs400ragtop]

I have an 01 Silverado 2500 HD 6.0L. Cluster was acting wacky, seemed like it was shorting out intermitently then it finally stopped working. I brought it to a local cluster repair facility and they told me it checked out fine. After putting it back in my truck I found that plugging in the cable from my scan tool to the computer port gets it to work perfectly fine, but when I try to read my truck for codes through the same port I get a "cant communicate" reading. Anyone have a clue whats going on?

[j cAT]

Originally Posted by gs400ragtop

I have an 01 Silverado 2500 HD 6.0L. Cluster was acting wacky, seemed like it was shorting out intermitently then it finally stopped working. I brought it to a local cluster repair facility and they told me it checked out fine. After putting it back in my truck I found that plugging in the cable from my scan tool to the computer port gets it to work perfectly fine, but when I try to read my truck for codes through the same port I get a "cant communicate" reading. Anyone have a clue whats going on?

check ALL FUSES . use a meter ..it may be the cigarette/power ports circuit blown..

could also be LOOSE fuse sockets..if thats all good check all grounds in the engine area..then at the other locations.

[pottss55]

my 2002 1500 did same thing even working with scanner . my quess is that is grounding you pcm because i clean pcm it was full of water and all corroded . cleaned it and every thing is fine . I have a blog on here : security lights stay on and more . dealer did sell me an ignition switch that maybe i didn't need but they did me right by hours od diagnoses