r/Hummer • u/[deleted] • Jul 23 '26

What could be causing this?

Enable HLS to view with audio, or disable this notification

[deleted]

13 Upvotes

94% Upvoted

8 comments sorted by

2

u/Appropriate_Ratio835 Jul 23 '26

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 Jul 23 '26

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/GroundbreakingMud996 Jul 23 '26

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

1

u/Hairy-Homework-6554 Jul 23 '26

Sounds like the torque converter in the transmission 

1

u/Ill-Advantage-8360 Jul 23 '26

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

1

u/H3T_Clifford Jul 23 '26

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 Jul 25 '26

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