Question about 2006 Hummer H3

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

I have had my H3 for about 2 1/2 years and now it is making a rather loud noise and losing power for a brief second when the car is shifting from 1st to 2nd gear. It is an automatic so I am only guessing that it is the shift between 1st and 2nd. When I shift the car manually it does not have a problem at all. Is this a transmission problem?

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

Posted on Nov 02, 2009

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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
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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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Transmission making loud grinding/sucking sound, doesn't go when in drive or reverse


Is it an automatic John? When was the last time you checked the level of your ATF (automatic transmission fluid)?

There are many different types, so make sure you get the right one.

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1) Loosing antifreeze 2) tranny shifts funny


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Only runs in 1st and 2nd gear and reverse.


This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

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Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

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2 Answers

Seems to stick in 1st and 2nd gear


First signs of the trans going out. rebuild or replace.

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