Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

L5P trouble codes, need help

Recommended Posts

Hey guys, I’m new here and I’m looking for info. I have a 2018 L5P and It has custom tuning and has for the last 2+ years and 25k+ miles, I was driving the other day and it went into limp mode, it’s throwing 3 codes P0046 U18A2 & U0076. I have the can bus dummy plug and nox sensor plugs on the truck. I have replaced all 4 plugs just for safe measure as I live in northern Wisconsin where the salt gets at everything. I called my tuner and they said it’s not a problem with tuning but the truck. I’m thinking maybe it could be a bad turbo actuator? Or could there be just a broken wire somewhere in the harness for the canbus? My fuel gauge does not work, turbo builds no boost and I don’t have enough fuel pressure to get over 2k rpms. Any help and info would be great! Thanks!


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...

Important Information

By using this site, you agree to our Terms of Use.