Ground locations

[Chris41586]

I had created a post before, explaining some electrical issues I'm having. The main thing I'm looking for right now, is every single ground location for a 2017 Sierra 1500 with the 6.2, if anyone knows if a drawing or something to show me where grounds are that don't stand out. The ones I've found: both sides at the A pillars under the dash at the windshield, the one of the main ones from the battery(the other one disappears under the motor, and I can't seem to get to it. There's also a ground someone had added that goes into the obd reader harness for some reason. Any help and info is greatly appreciated

[Chris41586]

Update: I found a couple more grounds to check and clean, but the issue is still happening. These are the codes that come up, and the BCM is the main thing I'm looking at. Is there a way to know for sure before getting another and having it programmed?

[rav3]

Several good videos on YouTube showing all the main body grounds. As far a your codes, keep in mind that a good numbers of these faults can be traced back to Bad ground at the individual wire connectors, depending on where the connectors are located. Not to be confused with the Body grounds

Edited March 25, 2025 by rav3

[Chris41586]

56 minutes ago, rav3 said:

Several good videos on YouTube showing all the main body grounds. As far a your codes, keep in mind that a good numbers of these faults can be traced back to Bad ground at the connectors, depending on where the connectors are located. 

Yeah, I've been going through every video I can find, but they're usually the same locations. As I dig around, I find more and more little ones, so I was hoping there's something showing every single one. When you say "at the connectors", are you talking about the ground wire itself not being seated into the harness well? The thing that's getting me, is the problem seems to happen when my truck has warmed up a bit. So I'm trying to figure out if it's a signal trailing off, or if a ground issue would still cause this. The last couple of times I've looked at it, I just start my truck and dig around and the problem happens after running about ten minutes. I thought it was being caused by a vibration breaking a connection, but doesn't seem to be the case

[rav3]

I'm talking about all the plastic connections/connectors where the system wire connect, not body ground. I watch a YouTube channel call South Main Auto. Eric is about the most knowledgeable mechanic that traces each wire & tests them where wire harness connects, depending on the bad code reading. I can't tell you how many of these electrical issues are traced back to a plastic connection & either the .5v lead or the ground is corroded & has to be repair. He'll find the "green crusty" every time. Great guy & great channel. 

[Chris41586]

4 hours ago, rav3 said:

I'm talking about all the plastic connections/connectors where the system wire connect, not body ground. I watch a YouTube channel call South Main Auto. Eric is about the most knowledgeable mechanic that traces each wire & tests them where wire harness connects, depending on the bad code reading. I can't tell you how many of these electrical issues are traced back to a plastic connection & either the .5v lead or the ground is corroded & has to be repair. He'll find the "green crusty" every time. Great guy & great channel. 

I'll definitely have to check this guy out. Thanks for the info