Question about 2004 Hummer H2

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I have reduce power in my 03 H2 warning came on. where do I start troble shooting

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Call first to confirm but most of the chain auto parts stores will do a free scan of your computer and retrieve the error codes you need to start troubleshooting.

Posted on Apr 02, 2011

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Posted on Jan 02, 2017

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1 Answer

MY H2 REDUCE POWER


My hummer H2 2003 did the same and I checked the coolant it was low.Refill the coolant and start the vehicle,if problem of reduced power persists check the thermostat if its not faulty.Hoping this will solve your reduced poweproblem

Sep 26, 2014 | 2003 Hummer H2

1 Answer

Reduced engine power warning


there is a acuator that contolls the throttle they dont use a cable anymore. thats were i would look 1st

Jun 12, 2012 | 2003 Chevrolet Tahoe

1 Answer

Reduced engine power, warning displayed in panel. No acceleration Hummer H2 ,2003- 4.3 vortex. Tried disconnecting battery to reset, failed.


Needs to be put on computer to read codes to see whats going on.Could be one of many things going on there.

Mar 08, 2011 | 2003 Hummer H2

1 Answer

H2 reduced engine power


Check the throttle body first see if it's opening all the way when you press the gas

Jan 29, 2011 | 2003 Hummer H2

1 Answer

03 h2 heated seat problem


Check the wires under the seat sometimes they frae when moving the seat back and forth.

Also they will auto turn off it is getting to hot or a wire inside the seat is contacting another wire so check where you can for bad contact.

Hope this helps

Jan 22, 2010 | 2003 Hummer H2

1 Answer

Cadillac 2003 Reduce engine power


when you replace the throttle actuator, you need to calibrate the part with a proper diagnostic tool

Jun 02, 2009 | 2003 Hummer H2

1 Answer

Need Service Manual for Hummer H2


THIS IS THE PAGE WERE YOU CAN DOWN LOAD THE OWNERS MANUAL 400 PAGES TOTAL. WWW.HUMMERXCLUB.COM/MANUALS/2003H2.PDF

May 28, 2009 | 2003 Hummer H2

3 Answers

03 H2 HUMMER WONT START


Does your scan tool have a reset eeprom mode?

if not, try disconnecting the battery for a 30 min period, then try

Feb 27, 2009 | 2003 Hummer H2

1 Answer

My hummer h2 03 is not gettig start it shows big lock in the dash. some one told me its security lock?


The security transmitter in the key could be bad, or the passlock system is bad. try taking it to a GM dealer, so they can reprogram the system

Feb 25, 2009 | 2003 Hummer H2

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