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

levels good (tranny dip sticked , hot, idle , in park)
shift linkage not bad. PRNDL
does car move in park if car, is in park, and take off all brakes
can car be pushed,? if yes park is failing too, and is bad shift linkage.
this is step 1 and 2 in the service manual on topic
of like 20 test. on car.
RTM read the manual yet? buy it ?

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

Dealer Checked my Hummer. They said all H3's have the same problem ...

www.elcovaforums.com > ... > General H3 Discussion

Sep 15, 2005 - 24 posts - ‎17 authors
rattling sound inespected in my hummer because ... go uphill or press on the gas pedal to ... same time up to 2500 rpm on my H3. .... Buzz or Rattle Noise While DrivingUnder Load from the Exhaust ... 2006 Hummer H3

Slow Gear Shift, Low RPM - Normal for H3? - Hummer Forums ...

www.hummerforums.com > ... > Hummer Lineup > Hummer H3

Mar 6, 2012 - Hey All! I recently bought a used 2007 H3 (automatic). ... for h3"!!.if it dont feel normal,,it aint!! im driving my 2nd h3 and they both felt ... 2006 Hummer H3... you can tell when locked up. go ez on gas and rpms dont jump,they ... Hummer H3 Won't get above 2.5 RPM - Hummer Forums ...
Jun 26, 2014
My h3 loses power and sometimes turns off when i turn
Mar 16, 2010
More results from www.hummerforums.com

RPM bouncing from idle. Caused short bursts of "unintended ...

Sounds like you have a bad shifter or a bad slave cylinder. Check the fluid in the reservoir and if you're losing some, then you need to see where the leak is coming from. If it's at the slave cylinder, you're in for an expensive repiar.

You have a slipping clutch in the first epicycle gearing in the gearbox - it will have to be completely refurbished.

1st you should have it inspected to make shure the compressor is turning, if its not turning all the kits to charge come with instructions. 2nd if its really low u have a leak and need to get it fixed- as if u keep filling a leaking system this is considered a voulantary relase of freon into the atmosphere and is against the law

SOUND LIKE STICKING SHIFT VALVES IN VALVE BODY.ALSO CHECK TRANSMISSION FUSE.

if your exhaust is loose it causes car to run hotter, also if you are running the wrong gas in it, so check on that.HOWEVER your thermostat and water pump are the main suspects here. If you are losing antifreeze, it may be a blown head gasket which is No good, this is caused by your 2 main suspects here. Check oil and tranny fluid levels. you cant keep driving a car thats having problems, .. thats how you get bigger problems like blown head gaskets. TRUST ME. as a teen i owned 3 differnt cars, and had to chang head gasket on every one of them because of POOR MAINTENACE. check these things, and get back to me

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.

Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmission is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the under hood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.

No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

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.

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