4L60E Only Goes into 1st and Reverse - What Could Be Wrong?

I’m facing a frustrating issue with my vehicle’s 4L60E transmission. It seems to only allow shifting into first gear and reverse, and I’m at a loss as to what might be causing this.

Symptoms

  • When I start the car, it goes into first gear without any issues.
  • I can also shift into reverse without problems.
  • However, when I try to shift into second gear or higher, nothing happens. The engine just revs without engaging the higher gears.

What I’ve Tried

  • Checking the transmission fluid level, and it looks fine.
  • Flushed the fluid recently, so I’m hoping that’s not the issue.
  • I’ve also scanned for error codes, but nothing came up that suggested an electronic issue.

Potential Causes?

  • I’ve read about the possibility of a stuck solenoid or a malfunctioning valve body. Could something like that be the culprit?
  • Is there a chance of clutch issues even though I can shift into 1st and reverse?
  • Any advice on how to diagnose this further?

Any Help is Appreciated!

I’m looking for any tips, shared experiences, or possible fixes from those who’ve dealt with similar transmission problems. Any insight would be incredibly helpful as I don’t want to jump to replacing the transmission without trying to solve this first.

Thanks in advance for your help!