2004 Tahoe gauge cluster issues

Ok guys, I know this topic has been discussed to death. But...hear me out because I'm not sure what to do here. So, my gauge cluster doesn't want to start when it's hot outside. Just the check engine light. Not movement of the needles or the DIC and PRND. After a few minutes of driving, it will USUALLY come on and start working. Here lately, it wont come on even after 10 minutes or so. So, I build a little test bench and took apart the cluster. Plugged it in, and everything works perfectly lol. I've bent the board (gently), poked all the little resistors, and wiggled everything I could get my fingers on. I can't replicate the issue. I've even actually lifted up one of the 240 resistors near the speedometer stepper motor with my knife, and it came up (need to be resoldered) and it affected nothing. Where do I go from here? Should I just resolder every single joint that I see?

I'm seeing people poke resistor with a pencil eraser to find where their issue is but I can't replicate it that way. Everything seems to work perfectly.

If'n it were me I'd be fixin' those dead backlight bulbs.

Make sure that the pins on the main connector have good solder joints to the board, and that the pin fitment to the body harness is good. Also clean the board with some 91% alcohol and a soft toothbrush, to make sure there's no silver migration.

Test both powers and grounds (two each) at the body harness to see if they are all solid when you turn on the key. You obviously have the connector pinout.

If all else fails maybe grab one at a junkyard or UPull to see if it's the cluster.

Well sir, I am indeed fixing the dead backlight bulbs lol. I know it's the harness because I put my 2003 Suburban harness in it as a place holder and it's working perfectly. So it's somewhere on the board. I just can't replicate it. I'd rather it had just been completely dead all the time. It would've been easier to diagnose. It only does it when it's hot out though. Not warm, but hot. I live in East TN so it's hot out right now.

03GMCYukonXL said:

Well sir, I am indeed fixing the dead backlight bulbs lol. I know it's the harness because I put my 2003 Suburban harness in it as a place holder and it's working perfectly. So it's somewhere on the board. I just can't replicate it. I'd rather it had just been completely dead all the time. It would've been easier to diagnose. It only does it when it's hot out though. Not warm, but hot. I live in East TN so it's hot out right now.

Click to expand...

If you know it's the harness, why is it the board? I'm confused.

Sorry, that was a typo/brain fart. I know it's the cluster, because I put in my Suburban cluster and it's working fine. I don't know why I replaced the word "cluster" with "harness".....long hot day lol.

The very instant you pulled off the cluster harness connector you altered the conditions. What about the cleanliness and pin tension of each of the pins in the cluster harness connection?

My own first action would have been to test communication with the cluster through the DLC

TJ Baker said:

The very instant you pulled off the cluster harness connector you altered the conditions. What about the cleanliness and pin tension of each of the pins in the cluster harness connection?

My own first action would have been to test communication with the cluster through the DLC

Click to expand...

I understand that. But the fact that my 2003 Suburban cluster is working perfectly kind of eliminates the possibility of it being the pins on the plug side. And I have checked the pins on the cluster side of the connector as many ways as possible and they check out perfectly. I have no clue how to test the communication with the cluster through the DLC. You have a link on how to do this?

Could it have been oxidation on the pins? Did you try your original cluster after trying your '03 burb cluster?

mikez71 said:

Could it have been oxidation on the pins? Did you try your original cluster after trying your '03 burb cluster?

Click to expand...

Not yet, but I am still going to tidy up some of the solder because some of the resistors actually need it, plus I need to replace some bulbs. Then I'll plug it back in

03GMCYukonXL said:

But the fact that my 2003 Suburban cluster is working perfectly kind of eliminates the possibility of it being the pins on the plug side

Click to expand...

Not really. I have witnessed continuity failures in harness connectors where before unplugging I am monitoring the circuit. Just place a finger on the wire at the connector and I see a voltage spike or dropout. Sometimes oxidation builds up and just unplugging and reconnecting a connector scrapes off enough of the oxidation to restore continuity. Usually just a temporary 'fix'.

I once had an intermittent no crank condition. Eventually it happened when I had time and a meter handy. Down at the starter I found a cable that showed power on the cable conductor, power on the cable terminal eyelet, power on the washer, power on the nut, NO power on the stud. Everything looked clean and tight. A thin film of oxidation.

After putting your other cluster in as a temporary,,,, have you tried the original cluster back in the vehicle?

Might try DeOxit or CRC QD Electronics cleaner on the connectors.

If u start the truck, can u push lightly on the cluster on the middle bottom just above the column. Does it do anything? If it works on another than it is rebuild time. There are fokes online that will rebuild it or send u one and urs is a core.

LsHart said:

If u start the truck, can u push lightly on the cluster on the middle bottom just above the column. Does it do anything? If it works on another than it is rebuild time. There are fokes online that will rebuild it or send u one and urs is a core.

Click to expand...

I tried that and it did nothing. Literally it just wouldn't come on for about a minute or two when it's hot outside. Lately, it hasn't turned on at all. In the morning when it's cooler, and of course in all the other seasons, it worked just fine. I have already replaced the lights and freshened up all the solder joints I can get to. I'm more of a DIYer if I can. I'll throw it back in this weekend and see if it works the same as it does on my desk. Thing is, is no matter what, it's going to work well on my desk because it's cool in the house. So, I'll just have to see what it does in the hot car after my repairs.

Testing with a blow dryer or with a heat gun (carefully) might help expose the cause.