Question about 2004 Hummer H2

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My 2003 h2 transmission not engaging gears slips in gear.I switch it on off then it engages .what could that be?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: my 2003 h2 hummer will initally not shift from

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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SOURCE: 2006 Hummer H2 tranny problem

sounds like your torque converter is damaged and will need replacing. make sure fluid is up to proper level, but I wouldn't get too hopeful...

Posted on Jun 23, 2011

  • 14 Answers

SOURCE: 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 ***!

Posted on Nov 26, 2011

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1 Answer

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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Git a pressure test done to rule pump and torque convertr out. May hav worn bands n clutches. Or in need of ajustments. Cud hav air in system or cloggd valve body from a flush. Electronic control may b off. First chec fluid level and correct brand for that engine

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When you say the vehicle "won't go into gear," do you mean you cannot move the lever out of PARK, or do you mean that when you move the lever out of PARK the transmission will not engage?
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2006 Hummer H2 tranny problem - recently towed a horse trailer in reg mode and now the tranny slips in 1st gear. It engages after the rpms reach 2000 rpm. Once engaged the truck lunges forward. The...


sounds like your torque converter is damaged and will need replacing. make sure fluid is up to proper level, but I wouldn't get too hopeful...

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1 Answer

1998 GS manual Previa with 140k on clock. Has recently started slipping in 4th gear - if changing up from 3rd or down from 5th its asthough something isn't engaging and no further power from the car can...


Sounds like your transmission has come to the end of its life. You can try getting the transmission flushed , and an additive I.E. No Slip added. That might cure some of the problems but obviously if its slipping the clutchs inside are worn out and transmission needs an overhaul.

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