U1301 code on lbz - Chevy and GMC Duramax Diesel Forum
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post #1 of 3 (permalink) Old 07-21-2019, 03:39 PM Thread Starter
Join Date: Jul 2019
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U1301 code on lbz

Im new to the diesel world and recently purchased a 2007 gmc 2500. The truck has an exhaust, egr delete with blocker plate, and an efi live 5 tuner. The guy I bought it from says the check engine light has come on and off for a few years now, but everyone told him it’s fine and to drive it how it is. I scanned the truck and got the u1301 code. From what I’ve read online this controls all the accessories, lights, radio, gauges, etc. Everything works fine and the truck runs great. Has new batteries, newer alternator, glow plugs were recently replaced. He has a random ground wire under the hood that someone told him to do because of electrical issues in the lbz, but idk if that could be the culprit. Just not sure what could be causing this. Thanks!
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post #2 of 3 (permalink) Old 07-21-2019, 06:01 PM
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Well unhook the wire and see what it does.
Btw welcome.

My name is Nic
2012 qcsb 6.8L cummins, 48re swapped, ratchet shifter with pcs vb
2011 GMC Sierra 2500 CCSB LML,
Lil ole single s400, fuel,
supporting mods,
rancher tuned,
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post #3 of 3 (permalink) Old 07-22-2019, 05:27 PM Thread Starter
Join Date: Jul 2019
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Originally Posted by SilverGorillaLML View Post
Well unhook the wire and see what it does.
Btw welcome.
I unhooked the extra ground, didn’t take the light away. I went ahead and cleared the code. Guess if it comes back I’ll start messing with wiring harnesses and see if anything is loose
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