Question about 2003 Hummer H2

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My 2003 h2 hummer will initally not shift from

My 2003 H2 Hummer suddenly started having some problems and will not shift from gear one to gear two. Just stuck in gear one. After a while, it now will not move on gear at all. what could be the problem

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Check the linkage that goes from the shift lever down to the transmission. It sounds like somewhere along the line, it has become disconnected or has broken.
if that parts are clean then It sounds like you have a shift control solenoid that has high resistance causing the hard shift you describe. Scan the PCM for trouble codes if none are present you could have a internal transmission problem.

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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At what RPM 1st gear should shift on a H2 Hummer 2003


well is that hummer that a 2 ton or 4 ton vehicle ?

would take a lot of revs for first gear to make it roll from a standing start
think it will be fitted with an 6 speed automatic transmission

guessing only from my heavy vehicle driving experiences
first should change below 3000 rpm

if transmission was slipping in first gear you would know

suggestion
ring up the local hummer service division for the correct answer





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2003 h2 hummer transmission will not shift out of first gear


if you changed selinoids i hate to say it but i think its toasted. but before dropping the cash on a new ****** i would go to the nearest chevy dealer and have it put on the computer. this way if when they update your software it doesnt fix the problem you need a ****** shop.
my hummer set for nearly six months and when i started driving it again i thought my ****** was toast, it would go through all the gears but slipped like no other, i went online and bought a superchips programmer and all was well again. somtimes the computer just needs kicked in the ***!

Nov 18, 2011 | 2003 Hummer H2

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Hummer H2 2003, shifting problem


Yea, hummers are notoriously unreliable. They are gas gusslers too.
I'm assuming this is an automatic?
When the transmissions computer detects any malfunctions, it will give you a check engine light, or something along those lines.
Do the normal checks such as checking the transmission fluid level as per the user manual.

For further diagnostics you'll need to take it to a mechanic. It's impossible to diagnose a problem like this without driving the car and being able to reproduce the problem.

Aug 09, 2009 | 2003 Hummer H2

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MY 2004 H2 Hummer is in park... I can start it but no matter what I do I cant get it out of park??? any Idea's


Do your brake lights work? It might be the brake switch or the shift interlock solenoid.

Jun 08, 2009 | 2003 Hummer H2

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