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NHTSA — Power Train: Automatic Transmission Problems


hardly worth mentioning
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
92,000 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Hummer H2 transmission problems

transmission problem

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2004 Hummer H2 Owner Comments

problem #1

Oct 272008


  • 92,000 miles


GM 4L65-E or 4L65E transmission problem. Engine light has been on and frequently the 4 speed automatic transmission loses first and fourth gears. Will not automatically downshift from third to second (this can be done manually - only 2nd and 3rd work though) - feels like it will not come out of drive automatically when slowing all the way to a stop. It has been acting erratic from normal to problematic - error code indicates 'torque converter clutch solenoid lock up' a youtube video might describe it here: I could see where it very well could cause an accident because the transmission slips when it decides it wants to.

- Torrington, WY, USA

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