Hummer h2 2003 reduced engine power - Hummer Forums - Enthusiast Forum for Hummer Owners


Hummer H2 For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.

Reply
 
 
 
Thread Tools Search this Thread
  #1  
Old 08-19-2017, 04:13 PM
Junior Member
Thread Starter
 
Join Date: Aug 2017
Posts: 1
Default Hummer h2 2003 reduced engine power

Hi,


my hummer 2003 h2 had check engine light on and reduced engine power. Clear the code back on the road, drove for few miles and code came back few times, got these few things done to fix the issue:


Replaced the throttle sensor at first that didn't do the trick,
second time
replaced throttle body, (with gm parts) not aftermarket
and it was running great up tp 1600 miles after 1620 miles reduced engine power came back on again.
Now i am tired of this problem. I have changed the accelerator padel sensor as well and it gave me code 2 times today after doing all this!
If someone could please help me out with this issue
what do i need to do with this madness!!
Reply With Quote
  #2  
Old 08-21-2017, 06:27 AM
H2 Chief's Avatar
Junior Member
 
Join Date: Jan 2017
Posts: 16
Default

Look at your temperature gauge, is it overheating? Hummer does this as a safety feature. Just a thought..
Reply With Quote
  #3  
Old 08-23-2017, 09:12 AM
Member
 
Join Date: Apr 2010
Posts: 88
Default

There are a few common issues that can cause this problem,

A wire breaks about 6" from the throttle body in the harness,
corrosion at the plug on the TACM,
Disagreement of the position sensors
Loose grounds

Do you have a way to pull the freeze frame data record to see what was going on at the time the code was set?

Neal
Reply With Quote
  #4  
Old 08-24-2017, 04:21 AM
oceanbrave's Avatar
Senior Member
 
Join Date: Feb 2015
Location: Birmingham (UK)
Posts: 212
Default

The "codes could be very significant, what were they?

Last edited by oceanbrave; 08-29-2017 at 04:40 AM.
Reply With Quote
  #5  
Old 08-28-2017, 05:13 PM
Zombie01's Avatar
Member
 
Join Date: Jul 2012
Location: North of Denver
Posts: 36
Default

I had a guy crack the temp. sending unit and it put the ECM into reduced power mode on another GM 6.0 LQ4 engine. Check the connection at the temp sender, check the temp sender.

Otherwise, spend the $100 and have someone with a TECH II find the problem for you. Otherwise you are just throwing money a the problem.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Reduced Engine Power BigSam1971 Hummer H2 7 07-20-2016 07:43 PM
Engine dies, "Reduced Power," no start for about 3 minutes bureau13 Hummer H3 20 12-05-2014 03:44 PM
reduced engine power H2 Hummer H2 19 07-24-2013 10:58 AM
H2 2005 reduced engine power. jasonsdad Hummer H2 10 12-25-2011 10:39 AM
Reduced Power, Stabilitrak failure, engine light on...Whats up??? markthetech Hummer H3 1 02-02-2011 12:55 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertising
Featured Sponsors

All times are GMT -5. The time now is 12:50 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.