Power loss light/codes - 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 Vortec 4.2L I-6 Engine and Drivetrain

02-09 Vortec 4.2L I-6 Engine and Drivetrain Q&A forum for engine and drivetrain repairs/modifications/tuning.

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  #1  
Old 01-26-2009, 04:43 PM
rjmac22 rjmac22 is offline
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2005 Chevy TrailBlazer LS
Onyx Black 4.2L I6 4X4
Join Date: Feb 2008
Location: Erie Pa
Posts: 6
Power loss light/codes

My loss of power Light on my 05 6cyl Trailblazier comes on occasionaly. I have also noticed some surging. Went to Autozone and checked the codes. There were 3 codes stored PO171 PO172 and PO130. Any recommendations?
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  #2  
Old 01-26-2009, 04:56 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
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P0171: Excessively lean. Test for fuel contamination, dirty injector, or fuel pump not keeping up at high throttle.

P0172: Excessively rich. Fuel contamination, injector supplying too much fuel, saturated EVAP canister.

P0130: Open loop control condition for more then 12.5 seconds. Oxygen sensor problems.

Since the oxygen sensor is what tells the PCM whether the exhaust stream is too rich or lean, I'd say the root cause is O2 sensor-related. You have one in the exhaust manifold and another down below near the catalytic converter. Sorry, I don't have the experience to guess which one is more likely to be bad. I just have the shop manual and looked into the troubleshooting flowchart.

For more reading: http://en.wikipedia.org/wiki/Oxygen_sensor



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  #3  
Old 01-26-2009, 09:44 PM
rogero rogero is offline
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2004 Chevy TrailBlazer LS
Silver Green Metallic 4.2L I6 4X4
Join Date: Jan 2009
Location: Kamloops, BC, Canada
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Hi,
New to the site and would like to say a loud HELLO to everybody. I live in BC, Canada.
Anyway, I had a recent problem with the P0130 code so I thought I'd share in my experience. The said code refers to Bank 1 Sensor 1 and it's the O2 sensor in the exhaust manifold. I bought an NGK but it only lasted a couple of days and the code came back. I went and bought an AC Delco sensor and the problem went away. I would suggest that you go with the AC Delco sensor as the price difference is not that significant anyway (at least here - both are expensive ).
Hope this helps.
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  #4  
Old 01-26-2009, 09:59 PM
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petevw petevw is offline
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2002 Chevy TrailBlazer LTZ
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Quote:
Originally Posted by rogero View Post
.....I went and bought an AC Delco sensor and the problem went away. I would suggest that you go with the AC Delco sensor as the price difference is not that significant anyway....
AC Delco exhaust manifold oxygen sensor from RockAuto is only $37 + shipping.

Not too bad
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  #5  
Old 02-02-2009, 11:09 AM
dorman68 dorman68 is offline
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2005 Toyota corolla
red Other 2WD
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Sounds like you need an oxygen sensor. Fairly common failure.
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  #6  
Old 03-13-2009, 10:34 PM
cfd1101 cfd1101 is offline
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2005 GMC Envoy SLT
Silverstone Metallic 4.2L I6 4X4
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Location: Corning, NY
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Power loss light/codes

I had same problem with my 05 Envoy. Dont recall loss of power light- SES light did come on. Took to A trusted GMC dealer- they said it might be cat converter. They could not fix because they are a medium duty Gmc. Took to dealer where bought. They did NOT think it was cat conv- but a O2 sensor ( manifold) $100 and on my. Truck did run better, but no power. Took back to dealer- YES it was the cat conv. Emissions warranty covered it ( 8yrs/80000).
otherwise would have been $800 plus
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