Accelerator Pedal Position, Reduced Engine 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 General Tech Q&A > General

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  #1  
Old 11-20-2010, 11:17 PM
KennyTN KennyTN is offline
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2003 Chevy TrailBlazer LT
Sandstone Metallic 4.2L I6 2WD
Join Date: Nov 2010
Location: Nashville, TN
Posts: 2
Accelerator Pedal Position, Reduced Engine Power

I recently purchased a 2003 Trailblazer 6 cyl 4.2 with 45000 miles on it. With in the first week, the reduced engine power came on and check engine light. I took it to Autozone, and the OBD displayed two codes for Accelerator Pedal Position Sensor. They didn't have one in stock so I ordered one for Autopartwarehouse.com, a Dorman RB699100. Once I replaced it, everything seemed to be fine, then I took a trip to Texas (800 miles each way) and on first leg of the trip the Reduced Engine power and check engine light came on after 8 hours of driving and for the next 5 hours came on a total of 24 times. I had to pull of the road each time and turn off and start engine 3 times to reset the CEL and Reducer Engine Power. After I returned from Texas, contacted the seller and they arranged a return authorization but wouldn't sell me another. I place the original part back in and since then it has gone to Reduced Engine Power 5 times in 4 weeks. I take it in to Autozone and the codes are the same... Accelerator Pedal Position Sensor (either not enough voltage or failure). I;m about to make a trip to San Diego, a 30 hour drive both ways.. I'm a little nervous about this truck shutting down in the middle of the nowhere. Any suggestions???
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  #2  
Old 11-20-2010, 11:59 PM
the roadie's Avatar
the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
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The exact codes (not the Autozone interpretation, which can be wrong) would be very useful. The reference 5V voltage for the pedal sensors is shared by the throttle butterfly valve sensors and the fan clutch RPM speed sensor.

Or it could be damaged wiring between the PCM and those three sets of sensors.

Didn't we have an owner in here in the last month or two saying he couldn't find this sort of intermittent problem and he was just going to trade it in and stick the next owner with this problem?

Seriously, we hear this sort of thing monthly - owners without the chops to troubleshoot properly and they shotgun the problem poorly and end up losing their shirt on a trade-in if they're honest, or losing karma if they sell the vehicle and aren't honest.

Did you buy it from a place that gave you a warranty, or from the previous owner in a private sale?
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  #3  
Old 11-21-2010, 12:28 AM
KennyTN KennyTN is offline
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2003 Chevy TrailBlazer LT
Sandstone Metallic 4.2L I6 2WD
Join Date: Nov 2010
Location: Nashville, TN
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from private sale

Thank you for your reply. I purchased the 2003 Trailblazer from a widow of a GMC company man here in Spring Hill. When he passed, his widow had the truck gone over and detailed by the local GMC dealership. It's a very clean auto just this weird problem. I'm hesitant to take it to the dealership as they usually charge an exorbitant price for their work. Can you recommend any honest mechanics for this vehicle in the Nashville/Franklin TN area? The codes I based my decision on was from the OBDII unit they sell in the store. I have since misplaced the sheet with the code on it but I believe it was P1271. Your recommendations? From reading the posts here, it sounds like this is a frequent problem with these vehicles. I previously had a 2003 Envoy and never had a problem like this. Thank you for your insight.
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  #4  
Old 10-19-2012, 08:14 PM
Kyle931 Kyle931 is offline
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2002 Chevy TrailBlazer LS
Magnetic Red Metallic 4.2L I6 2WD
Join Date: Sep 2012
Location: Fort Irwin, CA
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Dorman OE Pedal Position Sensor Problems p1271

I bought an 02 trailblazer 3 months ago and soon got the Service Engine Soon light and Reduced Engine Power light. I invested in a $60 code reader from Auto Zone (the best investment that I have ever made). I pulled up the code on the code reader and it read p1271 and p1271 p/d which means Excessive voltage difference between Accelerator Pedal Position Sensor 1 and 2. After looking at my Hayne's manual and forums I decided to order a new APP Sensor which is built into the gas pedal. I went cheap and bought the Dorman OE replacement APP Sensor fir $70. For those of you who don't know, OE is a cheaper (in both ways) version of the original part. I put the new APP sensor in and it ran without lights or codes for a few weeks before getting the SES and REP lights. After tons of forums, checking wires, a throttle body, and later I found on a forum that the Dorman OE replacement is junk and there is a high chance of it going bad after a few weeks. I am about to buy an OEM replacement and I will keep you posted on how it turns out.

I have found a lot of people on forums with no decent answers, so hopefully this helps the people in the same boat as myself.
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  #5  
Old 10-19-2012, 11:32 PM
wcosh's Avatar
wcosh wcosh is offline
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2003 Chevy TrailBlazer LT EXT
Dark Green Metallic 4.2L I6 4X4
Join Date: Aug 2009
Location: Vancouver BC
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Ditto..
I replaced my factory pedal because it was making funny clunk-clunk noises.
Went through no less than 3 aftermarket pedals that all failed after a few weeks. One actually lasted 3 months.
I am now running a new factory pedal and everything works perfect.

Sometimes it pays to stay with GM parts on certain critical components.
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  #6  
Old 09-04-2013, 08:51 AM
LisaPEI LisaPEI is offline
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2003 GMC Envoy SLT XL
Summit White 4.2L I6 4X4
Join Date: Sep 2013
Location: St Peters PEI
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OEM

I have been having the same problem with my envoy for a few months now. Everything that I find says you HAVE to order OEM from dealership. NO ONE has had any luck with after market part. It will work for a month or two and then they end up replacing it. Everyone that has replaced with OEM from dealership says it's fixed the problem....On my way to the dealer tomorrow
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  #7  
Old 09-04-2013, 09:15 AM
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dwright406 dwright406 is offline
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2006 SAAB 9-7x
Black 5.3L V8 AWD
Join Date: Jan 2009
Location: Houston, TX
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When I had the same problems with my '02 Trailblazer, I ended up getting a pedal assembly out of a wrecked TB from the salvage yard for $30, never had a single problem again after that.

The bushing that the original pedal pivots on actually wore out, causing the rheostat to lose contact, tripping the code and reduced power.
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