Transmission not shifting out of first gear

1996 CHEVROLET TAHOE
178,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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RICHARD 57
  • MEMBER
  • 1 POST
Transmission is not shifting out of first gear. Checked for transmission dtc codes and none are present. Fluid is clean with new filter. What could be the problem?
Mar 28, 2022 at 12:57 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

If there are no codes and you changed the fluid and filter, then it is mechanical.

It could be in the valve body not allowing the valves to move correctly. causing the issue.

The pressure control valve in the front pump is a common failure bey requires removal of the transmission to access and confirm.

https://www.2carpros.com/articles/automatic-transmission-problems

https://www.2carpros.com/articles/how-to-remove-an-automatic-transmission-rwd

Nothing simple here to help you. Sorry but you have an internal issue.

Roy
Mar 28, 2022 at 2:26 AM
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