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Old 12-08-2020, 01:38 PM   #4
richard2717
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Join Date: Oct 2011
Location: Eastern Shore of MD
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Re: 2006 chevy express 6.0 codes

Quote:
Originally Posted by gmc684x4 View Post
P171 and p174 are lean codes
P300 is misfire
Either take it to a mechanic or try fixing yourself lean out to much will kill your motor

https://www.700r4transmissionhq.com/...chevy-express/
Thanks for that link

Quote:
Originally Posted by biketopia View Post
How many miles on it? Could be due for a tune up. Lean codes could also be from a vac leak at the booster, or an exhaust leak. I'd check for exhaust leaks first.
has roughly 179k on it. I just bought this van for work and it had busted manifold bolts and a busted manifold that the place I bought it from fixed, so there are supposed to be no leaks now. I don't know any history on the motor so i guess my best bet is taking it to someone at this point. Since I lost my hearing several years back it would be impossible for me to listen for any kind of leaks.
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