Error code p0171 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 General Tech Q&A > General

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  #1  
Old 11-20-2010, 05:03 PM
kville44 kville44 is offline
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2006 GMC Envoy SLE
Dark Gray Metallic 4.2L I6 4X4
Join Date: Nov 2010
Location: Grand Rapids
Posts: 11
Error code p0171

Hello I just started getting the error p0171 lean on bank 1 I took it to the stealer and they told me that I needed a new maf and they wanted $400 to fix it, since this is an easy fix I bought the sensor for $70 and did it myself. I cleared the code and it has come back again, I do not have any rough idle or stalling or issues starting like I have read in other post with this issue. My mileage per gallon does not seem to be bad either I had to order an upstream 02 sensor since no one but the dealer carried them but they want $95 for it. I am only getting that one code if anyone can help I would really appreciate it.
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  #2  
Old 11-20-2010, 08:46 PM
Leinhit Leinhit is offline
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2002 GMC Envoy SLT
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so did you already get the 02 sensor and installed?

GR huh? I'm about 30 min's north of you...
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  #3  
Old 11-20-2010, 08:53 PM
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Bill W Bill W is offline
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2002 GMC Envoy SLT XUV
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No parts chains in a city the size of Grand Rapids have o2 sensors in stock? Kinda amazing.
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  #4  
Old 11-20-2010, 09:42 PM
kville44 kville44 is offline
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2006 GMC Envoy SLE
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No I should get it on tuesday but its driving me nuts that I cant get that error cleared. From what I have been reading it could have been the maf which I replaced the map sensor, or the o2 sensor. Since we only have 2 o2 sensors will it only thow out bank 1 codes ir does it still throw bank 2 codes.
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  #5  
Old 11-20-2010, 11:40 PM
Leinhit Leinhit is offline
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2002 GMC Envoy SLT
Imperial Blue Metallic 4.2L I6 4X4
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I would have gone w/ the 02 sensor first.. but thats just past experience..

and I also have seen the trouble code say one bank, when it meant the opposite bank.. dunno why... just that these trouble codes are not always that accurate...

if the 02 sensors were not expensive, I'd just do them both... but it if doesn't clear the code.. then consider the 2nd one ..

post if it fixes it...
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  #6  
Old 11-23-2010, 04:49 PM
kville44 kville44 is offline
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2006 GMC Envoy SLE
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I just replaced the sensor and had the code cleared the old one had some white spots on it I hope this takes care of the problem I will let you know.
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  #7  
Old 11-24-2010, 07:36 AM
kville44 kville44 is offline
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2006 GMC Envoy SLE
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no go code came back.
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  #8  
Old 11-24-2010, 12:06 PM
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neelskit neelskit is offline
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2002 Chevy TrailBlazer LT EXT
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Clean the MAF sensor and check for vacuum leaks. Most likely dirty MAF sensor ESPECIALLY if you have any kind of oiled filter (ie K&N) installed. If the filter is over-oiled, the oil sticks to the MAF elements and causes it to read incorrectly.
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  #9  
Old 12-14-2010, 02:25 PM
nlester nlester is offline
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2006 GMC Envoy SLT
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p0171

I have been dealing with a p0171 for weeks now. I have replaced the MAF sensor, Upstream 02, and the air filter to remove the black ring filter they say can set the code. I have checked for vacuum leaks and there are none. I have performed an AFITS test and the injectors and fuel pressure are good. Also have cleaned the injectors just to be sure. No driveability with the vehicle at all, runs great. The long term fuel trim is up to about 17% sitting at idle. Which from what I understand will set the code if above 10%. Now it seems the only time it sets is if I let it run to warm it up for approx 10 min since it's 10 degrees outside and sets everytime. Thinking maybe a crack in the plastic air intake that only shows itself when its cold. Any thoughts?
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  #10  
Old 12-14-2010, 04:51 PM
nlester nlester is offline
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2006 GMC Envoy SLT
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P0171

So we found about all of the intake manifold bolts loose. Very loose around cyl 5,6 about hand tight. The watched the long term drop from +24% to 6%. Looks like we got it!
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