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L5P trouble codes, need help

Rreeck43

By Rreeck43,
in 2015-2019 Silverado HD & Sierra HD

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Rreeck43 New Member

Rreeck43

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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!

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