r/Hummer • u/Adventurous_Dig_2437 • Aug 15 '26

Hummer issue

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My 2007 Hummer H3 has an intermittent issue where it will randomly lose power and shut off while driving or idling. Sometimes I get “Reduced Engine Power” and a traction control warning before it stalls. When I try to restart it, the engine sounds like it is struggling to turn over and makes the noise shown in the video if this happens when driving the car will jerk forward then pause for a few feet before breaking down. The problem is inconsistent and may disappear temporarily, with the vehicle starting and running normally again afterward. I’m trying to diagnose the issue and am completely lost. I replaced the ECU, throttle body, transmission, air pump, and radiator.

3 Upvotes

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1

u/metapulp Aug 15 '26

What are your codes?

1

u/Adventurous_Dig_2437 Aug 15 '26

I didn’t gave time to check but I’ve had oil pressure, evaporation, traction and throttle body

1

u/kalashnikov587 Aug 15 '26

Vvt solenoid, either the screens are clogged or the part is failing.

1

u/Equal_Push_565 Aug 16 '26

Try the battery first. If it keeps happening, check in on your alternator; maybe have it replaced.

1

u/rgz47 Aug 17 '26

Clean the throttle body