Reduced Engine Power Light/Loss of Power - 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 > OEM Issues

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Old 06-05-2011, 11:31 AM
trailblaze04 trailblaze04 is offline
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2004 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 2WD
Join Date: Aug 2010
Location: USA
Posts: 6
Reduced Engine Power Light/Loss of Power

I have an 04 Trailblazer 2WD and recently it has lost power twice while driving. The first time it happened the Reduced Engine Power light came on but the second time it didn't. I have noticed on both occasions I had just started it up and not driven a mile when it happened. I turned the engine off and restarted it and it was back to normal.

I went to get it checked out but they said they couldn't fix it and gave me a code. They said someone more qualified should look at it so now I'm trying to figure out what to do. The code is P1680.

Has anyone else dealt with this problem?

Also, I have noticed that when I start it up after sitting awhile I have to let it sit a few minutes because if I drive it right after starting the engine it will rev up when I pull out of the drive.
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Old 06-05-2011, 11:42 AM
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truefire98 truefire98 is offline
1999 GMC sierra ls 1500
Majestic Red Metallic 5.3L V8 2WD
Join Date: Feb 2007
Location: RIVERVIEW, FL.
Posts: 117
normally its related to the t/b and the accelerator pedal because the system is drive by wire, and there is no throttle cable, so ether the pedal is bad or the t/b is bad, and even sometimes the computer needs a reflash to update the problem. best bet is to take it to a dealer to see what is going on.
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Old 06-05-2011, 12:07 PM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
Posts: 26,181
Many discussions here mention that code.
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Old 06-05-2011, 12:08 PM
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christo829 christo829 is offline
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2004 Chevy TrailBlazer LT
Silverstone Metallic 4.2L I6 4X4
Join Date: Mar 2009
Location: Fairfax, VA
Posts: 1,298
Take a look at these two threads:

In that second thread, there's a resistance value listed for the APP. If you're
handy with a multimeter, you could check that. If it's bad, replace it. If
it's good, then could be solvable with a PCM reflash/update. Or...maybe a good excuse
to get a PCMforless tune...

Some members have found a throttle body clean to help as well: aning

Good Luck!

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