2018 Silverado 2500 duramax electrical problems

Levi Sullivan · January 9

So I've been battling some pretty bad electrical issues for about six months in my 2018 Silverado 2500 duramax. First happened one night at work where it started then immediately showed service power steering. Service stabilitrak. Service trailer brake controller. Also noticed that I didn't have a gear shift indicator. Nor where my rpm or speedometer gauge working. I moved the truck a little bit and also realized the transmission wasn't working properly and shifting funny. Turned the truck off and tried to turn it back on and all the same service lights came on but this time it wouldn't even crank. Ended up disconnecting battery cables for a while. Then it started and ran fine a few days. I took it to a shop. They couldn't find an immediate problem so put die electric grease on connections and sent me on my way. Well I didn't see the problem again for a couple months. But then it all happened again. Same service lights. Check engine light. And bad shifting. Got it home and pulled the codes on it. U0073 u0100. Sent it to the dealer in town beginning of November. They looked at it and said there was a code in it for the bcm so they decided the bcm was faulty and replaced that. Then told me my truck was fine. I took the truck to our local Walmart 5 mins away went shopping and came back out and got the service power steering service stabilitrak. Service trailer brake controller. And two new ones. Reverse cameravnot working. And service 4wd. I drove back to the dealer. And by the time I got there the lights went away and it was back to shifting fine. They said they couldn't see anything wrong with it. Though it showed the check engine light again. I left it with them for a week. They drove it multiple times that week and couldn't get it to act up so I went and picked it up. I Read about a g218 ground and was hopeful that was my culprit. Pulled my dash apart to check to see if there was sound proofing between the ground nut and the metal and there wasn't so it all looked good. So unfortunately that wasn't it. We'll got home and hooked my scanner up and saw the codes u0102 u0121 U0140 b127e. While running the scanner on the truck running it went to all the service lights again. And wouldn't connect with the code reader at all anymore. Then I turned truck off. And couldn't get it to turn back on. Tried unhooking batteries. Waited a couple days. Still no luck. Ended up towing it to a shop beginning of December. We'll they started trying to diagnose it. Went by unhooking things and hooking them back in. The guy got to the turbo unhooked it and hooked it back in and got the truck where it was running fine. They called me and told me this and I said I wanted them to keep looking because obviously something is wrong making this keep happening intermittently. Well for the past two weeks they've been trying to get it to act up to diagnose it further. Which it's acted up for them. But not consistently to trouble shoot it. It's so very intermittent. So now I've just been very upset with my truck situation and starting to wonder if anyone will ever figure it out. Or if I bought a lemon. Both batteries on the truck at new as of may. And both test good.

BNSF · January 17

Ishhh, sorry to hear about your problems. Any luck yet?

I had a parasitic draw, due to a faulty BCM. Dealer changed it out, and called me that they monitored it for 4 hrs, as few of the replacement were faulty from the factory. Sure enough the replacement had issues also. Got a second replacement the next day and it has worked fine since.

Maybe ask 'em to look at changing out the BCM again, and or ECM?

Edited January 17 by BNSF

CybeRube2 · January 22

There is an easy way to test for parasitic draw. Look at this video. Basically, you just check every fuse int he truck. Eventually you may be able to isolate it.

Levi Sullivan · January 23

No luck yet. Still in the shop. The batteries come back fine so it's not having a draw on it.

Levi Sullivan · February 28

So I got the truck back at the beginning of the month. The shop determined the glow plug control module was the culprit. Replaced it and it's been running fine since I got it back