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Transmission not shifting

Tiny
WOLF SHOMBER
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 270,000 MILES
So, I have a 4L60E in my vehicle. Just the other day I was given the truck and it was RPMs, it was finally shifted and that would be the only time it shifted. I would ride around 3,000 RPMs at 60 MPH.
There was a code reading for Shift solenoid 1-2. Which I replaced, along with the transmission filter, gasket and even threw 6 brand new NGK spark plugs in.
I also just did a brand-new exhaust manifold, exhaust manifold gasket, O ring and O2 Sensor replacement due to an exhaust leak.

Since doing all of these repairs and replacing all fluids, the truck doesn’t want to shift whatsoever. It will go into drive and will accelerate, kind of sluggish but will not shift.
Please help! I have work in the morning, and I just started this job. Now I fear I won’t make it. :(
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Sunday, April 17th, 2022 AT 10:10 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

First, could you let me know the codes you found originally? Also, does it shift into reverse normally?

What you are describing sounds like a line pressure issue. However, I need to know the codes you had. Also, let me know how dirty the fluid and filter were when you removed them.

Take care,

Joe
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Sunday, April 17th, 2022 AT 9:08 PM

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