Question about 2003 Hummer H2

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2003 H2 Hummer Transmission

My Transmission is shifting from 1rst to 3rd gear. I will not shift into 2nd gear. From first gear i have to gain 2500RPM minimal and completely let out of gas so it will shift up to 3rd so i can continue. I manually put it in 2nd gear with the shifter and accelerated slowly to 4000 rpm and let out of gas, reapplied the gas to check if it shifted into 2nd and it will not go into 2nd gear. all other gears 4 wheel drive ect. work great.

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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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  • 1 Answer

SOURCE: hummer h2 idle rpm too low

I can't solve the problem but was hoping you found the answer. I have a 2003 Hummer H2 and I am having the same problems if started in park or Neutral it will idle fine but if I put it in drive or reverse it will not idle

Did you find the solution and if so could you email me the fix.

tdunham@drainageplus.com

Thanks,

Troy

Posted on Jul 30, 2009

  • 315 Answers

SOURCE: 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.

Posted on Aug 09, 2009

abdoush
  • 12 Answers

SOURCE: change light on 2006 hummer h2

it can be easily changed by removing the plastic cover then u will see the light bulb, don't try to change it from the back, it wont open :)

Posted on Sep 08, 2009

iambanshee74
  • 3489 Answers

SOURCE: Hummer H3 Losing power when shifting from 1st to 2nd gear.

as odd as this may sound, try replacing the fuel filter.

Posted on Nov 02, 2009

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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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My 1999 ford ranger shifts hard from 2nd to 3rd gear what is the problem I recently changed fluid and filter but shifts hard !


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Auto Trans not shifting correctly from 2nd to 3rd Under the Hood. ... Become an EliteExplorer. Lithuania. 1999 5.0. Join Date: Jun 2003. Posts: 107 ... When this happens, the transmission will skip to the next gear like you said.

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1 Answer

H2 shifts gears at 4000 rpm rebuilt tranny could it b a sensor problem


No way to know that until the transmission is diagnosed and the systems control model scanned.

Mar 25, 2014 | Hummer H2 Cars & Trucks

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2003 h2 hummer is having shifting problems with transfercase. and the shifter moves freely even if the truck is off with out using break pedal


I had this problem with my 3002 H2, it was the transfer case. The OEM Transfer case has a plastic shifting fork. this wears out and eventually will cause the transmission to go out, I purchased a re-built transfer case on-line of $700.00 and had it installed for $500.00. problem solved....and the re-built has no plastic shifting forks.

Mar 27, 2013 | 2003 Hummer H2

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Transmission will not shift to 2nd or 3rd gear


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1 Answer

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

1 Answer

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.

Jul 17, 2009 | 2003 Hummer H2

1 Answer

1996 honda ciciv automatic transmission


that could be a result of your clutch being worn.....or worn gears. have it checked by a professional

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