GM How-To's and Tutorials Have a project you're working on? Take pictures and write up a procedure...We'll post it here!

308,453 miles on 5.3 2012 gmc sierra

Old 07-08-2018, 03:43 PM
Thread Starter
Join Date: Jul 2018
Posts: 1
Default 308,453 miles on 5.3 2012 gmc sierra

So i have a 2012 gmc sierra. Motors got a lot of miles on it and now it's starting to fail. I got a bunch of codes on it like 9 different codes. I don't know if it's reading it right or if the computer is failing. When i drive the truckit Chugs and the engine light and the stabilitrac and traction control lights come on. I don't know much about vehicles but i do know a little. It was reading a po301 code which is a miss fire in cylinder one. I thought it i changed the wires and the plugs that it would fix the misfire. It didn't. I then took it in to a mechanic and that's where they got 9 different codes. Theysaid po301, po0521, 0121,po561,3031,3060,po0770, po0121 4wd autorange indicator control circuit short to ground or open. I am surprised becauseit send like all these codes hit at once. It was driving fine except for my voltage meter kept going down to 9 volts then back up to 14 volts then back down? I still don't know why that was doing that. I figured it was a grounding issue so i installed another grounding strap to the engine block just below the alternator. I could really use some advice. Thanks.
Related Topics
Thread Starter
Last Post
Chevy Silverado/ GMC Sierra Forum
04-02-2013 03:10 PM
Ford Heavy Duty
04-17-2012 01:15 PM
Off Road
01-17-2012 11:31 AM
Chevy Silverado/ GMC Sierra Forum
10-06-2010 06:56 AM

Thread Tools
Search this Thread
Quick Reply: 308,453 miles on 5.3 2012 gmc sierra

Featured Sponsors
Vendor Directory

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.