2003 Hummer H2 Shifting Problems Sometimes No 3rd Gear UPDATED

2003 Hummer H2 Shifting Problems Sometimes No 3rd Gear

1. 02-13-2014,11:48 PM #1

   

   Baldheaded Tire

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   2007 H2 SUT won't shift into high gear. Delight advice/assist

   Houston, we have a problem!

   I have an 2007 H2 SUT with~ 80K miles that I have ain for about a twelvemonth. Information technology has been running fine untill about a week ago when information technology just would not shift by tertiary gear. It besides has problem shift from 2nd to third too. To reach threescore mph, the engine RPM is almost 5K. AFAIK, there has been no modification or tuning done to the engine. Since I am not remotely anywhere as knowledgeable as a mechanic, I accept no idea what'due south going on. Please help. Cheers in advance.

   Last edited by maddogg; 02-xiii-2014 at 11:53 PM. Reason: Spelling

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3. 02-14-2014,12:xi AM #ii

   Oasis't heard of that event but more knowledgable people should chime in soon...

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5. 02-14-2014,12:20 AM #three

   2007 H2 SUT won't shift into high gear. Delight advice/aid

   Bank check engine light on? Could be every bit easy equally just shift solenoids. Y'all have a ane-2 and a 3-4 solenoid. Take replaced both of mine for it not going into first. Then once again difficult to tell with just what yous have explained. Try hit an auto parts store or at worst case a dealer to encounter if at that place is any codes stored. I know AAMCO's used to advertise running codes for gratis. Not certain if they all the same do that

   2005 H2 Take chances
   

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7. 02-14-2014,12:40 AM #4

   

   Bald Tire

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   Cheque engine light not on. Thanks for the advice. I will take it to the dealer since I don't even know where the solenoid are.

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9. 02-14-2014,12:46 AM #5

   They are in the trans on the valve body. Once you drop the pan, they are higher up the filter. Could be some codes stored and not throw the light. Have had it happen before

   2005 H2 Adventure
   

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11. 02-17-2014,02:47 PM #half-dozen

    

    Baldheaded Tire

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    Thank you Zach. Will let you know what I find.

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13. 02-17-2014,03:28 PM #7

    Check your speed sensor, located, every bit I recall, on meridian of the transmission (or it is on my 03).

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15. 02-19-2014,12:45 AM #viii

    

    Baldheaded Tire

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    You don't have the tow button pushed exercise you?

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17. 04-24-2016,06:34 PM #ix

    

    Bald Tire

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    Hey just wanted to know if you always figured out what the problem was with you lot hummer non shifting correct? Mines doing the exact same thing

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19. 04-25-2016,09:11 AM #10

    Originally Posted by Darkcalm83@aol.com

    Hey merely wanted to know if you ever figured out what the problem was with you lot hummer non shifting right? Mines doing the exact same affair

    I hate to bespeak this out, but this thread is the sum full of maddogg's participation on this board. He never posted once again anywhere after that answer telling united states he'd allow u.s.a. know what he found, so he's probably never going to meet your question.

    Did your problem happen all at once, or did it develop gradually i.e. in that location was a period where information technology worked sometimes and non others, or there was a particular speed where it seemed to have trouble staying in 4th, or something like?

    I ask considering I am also seeing odd beliefs from my '05'due south transmission, or at least I believe it's transmission-related: At around 43-47 mph it feels as though the torque converter doesn't desire to lock up properly, and this gets worse when the trans temp gets upwardly effectually 200 degrees. When it's fully hot, the behavior can occur at speeds from effectually 37-38 upward to over 50mph. I accept also noticed that the trans sometimes has problem fully shifting into gear from park, where I'll shift, I'll feel it engage, but when I footstep on the gas it hesitates for a second, moves sluggishly, so something happens that feels like it fully connects upwardly and and so information technology works usually. I'grand really concerned that I'g going to have to have the damn thing rebuilt or I'll have to purchase a reman unit and bandy, and that's a big clamper of money.

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21. 04-26-2016,08:53 PM #eleven

    

    Bald Tire

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    Mine doing similar, another forum says information technology'south feature of the torque converters used on the 4L6x'south in the earlier trucks. Guy on the same forum inverse his for other reasons and says shifts are crisper, improve acceleration, less hunting.

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23. 07-31-2020,09:49 AM #12

    

    Baldheaded Tire

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    WOW, here it is 2020 and now my 2007 SUT is doing the same thing. It feels like I just have 1st and 4th gear. I wish he would take posted what was the gear up. I am going to endeavour to read the lawmaking but if annihilation I demand to change the fluid anyways. And then I might also alter the solenoids.

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25. 08-02-2020,01:19 AM #13

    Originally Posted by Cardodger

    WOW, hither it is 2020 and now my 2007 SUT is doing the same matter. It feels like I simply have 1st and 4th gear. I wish he would accept posted what was the prepare. I am going to attempt to read the code but if anything I need to change the fluid anyways. So I might likewise change the solenoids.

    Yup! 2020, pretty soon 2021, well few months. Love raising expressionless posts.

    But, seriously, post number 10 if you are experiencing however issues. Replace the trans and call it a twenty-four hours. I had the torque converter shutter at different speeds. And so, trans temp spiked. And smoked the trans. With the year and probably mileage you have. Trying to patch it or chase information technology volition price y'all more in the long run

    2005 H2 Adventure
    

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2003 Hummer H2 Shifting Problems Sometimes No 3rd Gear UPDATED

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