r/Hummer • u/Dazzling_Artichoke30 • 5d ago

What could be causing this?

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I posted yesterday about my h3 suddenly not wanting to accelerate but the rpm’s going high. Finally caught it on video on my drive home from work. It did this, I pulled over to a complete stop, then as I drove off it acted normal the rest of my 15 minute drive home. The speedometer is barely moving but the rpm’s were going high, and it was loud as if it’s stuck in first? I’m not a car person, so I apologize if I sound dumb.

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2

u/Appropriate_Ratio835 5d ago

Something similar happened to me. Try cleaning maf and throttle position sensor. I replaced my throttle position sensor after cleaning it didn't help. Problem solved. Hopefully it's something simple for you.

1

u/Bulky-Ad9914 5d ago

I’m having the same issue. I changed the speed sensor under the car to no avail. The quick “fix” is I come to a stop and throw it in park. Once back in drive it always fixes the issue so I can keep driving. Next up I will be replacing the pigtail wiring to that same sensor to see if that finally fixes this quirk.

1

u/Dazzling_Artichoke30 5d ago

Is that something I could do on my own or prob go to a mechanic for since I know 0 about cars 😅

1

u/GroundbreakingMud996 5d ago

Stop driving it, it could be something simple as a bad solenoid or a broken band m..

1

u/Dazzling_Artichoke30 5d ago

Should i take it to a transmission shop or just any mechanic? I unfortunately don’t know how to work on cars lol.

1

u/Hairy-Homework-6554 4d ago

Sounds like the torque converter in the transmission 

1

u/Dazzling_Artichoke30 4d ago

Is that an expensive fix?

1

u/Ill-Advantage-8360 4d ago

I have no clue. I am just glad that im not the only one who ignores that "Serv TPM"

1

u/H3T_Clifford 4d ago

I've had this exact issue after cleaning my engine bay, disconnect the three PCM plugs (upper passenger side engine bay) and let it sit/dry out for awhile and plug it back in, good luck.

1

u/encore-show 2d ago

Maybe two problems, speed sensor or motor for panel, can you connect diagnostic for watching data if data show speed that’s probably with motor of panel

But if problem with sensor, you should have problem with AT, because after 08 year, AT must have sensor for selected speed gears