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2004 chevy trailblzr-throttle position sensor replace


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stevieray89
New User

Aug 15, 2009, 9:43 AM

Post #1 of 7 (7174 views)
  post locked   2004 chevy trailblzr-throttle position sensor replace  

2004 chevy trailblazer-4.2liter-78k miles
Wifes truck--She called and said the truck was all of a sudden running real sluggish.....max speed 5-10mph-Has had "check engine"lite on for about 3-4 weeks---Just now when the sluggishness started .....this message was replaced with something like" low engine power" or "reduced engine power"-diagnostics check by uncertified personnel revealed engine codes relating to the throttle position sensor......it appears that there is one located on the throttle body and possibly one @ the pedal????? If so..........how do i determine which sensor.......and how hard is it for the average unmechanic guy to change out the sensor on the throttle body? I don't even know where the throttle body is so you get an idea of how much of a mechanic i am..........and is it possible for it to be a fuel filter problem? Thanks beforehand for any help on this matter.

Stevie Ray


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 15, 2009, 9:58 AM

Post #2 of 7 (7157 views)
  post locked   Re: 2004 chevy trailblzr-throttle position sensor replace  

You have a "Drive by wire" throttle system. It uses 2 TPSs, one ranging up and one ranging down. If one goes bad, the computer defaults to only partial throttle. You will have to replace the pedal position sensor to resolve the problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



stevieray89
New User

Aug 15, 2009, 10:10 AM

Post #3 of 7 (7153 views)
  post locked   Re: 2004 chevy trailblzr-throttle position sensor replace  

Thanks again for the quick response. One more question.....so i have some sense of how this works.............how would i know if i had to replace the "other" sensor? Once again.....thanks beforehand.............
Stevie Ray


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 15, 2009, 10:11 AM

Post #4 of 7 (7149 views)
  post locked   Re: 2004 chevy trailblzr-throttle position sensor replace  

They are both together in one part so you don't have a choice.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



stevieray89
New User

Aug 15, 2009, 10:14 AM

Post #5 of 7 (7149 views)
  post locked   Re: 2004 chevy trailblzr-throttle position sensor replace  

Great......first time i've used this type of site for anytype of repair or diagnostic information.........looks like it works great............


soglesby66
New User

Nov 2, 2016, 11:16 AM

Post #6 of 7 (124 views)
  post locked   Re: 2004 chevy trailblzr-throttle position sensor replace  

Hello - is this a dead thread? I have a related question... I've searched through the forum and not found anything quite like this issue.

I have a 04 Trailblazer I bought recently. The transmission had been rebuilt in it. Between 1500 and 2000 rpm - on level ground, no load - the transmission will start cycling up and down. Speeding up or slowing down will stop the cycling, as will going up or down hill.

A transmission shop diagnosed it based on those symptoms - to be the TPS and not the transmission. How can I confirm, or where should I go for next steps?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 2, 2016, 11:17 AM

Post #7 of 7 (121 views)
  post locked   Re: 2004 chevy trailblzr-throttle position sensor replace  

Of course it's a dead thread. It's 7 years old.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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