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2001 Chevy Silverado Hard shift 1 to 2

Tiny
BROWNJOE
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 143,000 MILES
I had my auto trans rebuilt and it shifts hard 1 to 2 what controlls the shift is it in the trans or something called the throtle position sensor?

Joe
Sunday, October 10th, 2010 AT 8:48 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,244 POSTS
The TCM (trans control module) controls when the shift happens. However, the shift solenoid makes it shift. Is the engine reving higher than normal before shifting? Have any warning lights come on?

Let me know.

Joe
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Sunday, October 10th, 2010 AT 10:41 PM
Tiny
BROWNJOE
  • MEMBER
  • 1 POST
No the engine rpms don't change, just shifts hard and quick, no engine lights.

Joe
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Monday, October 11th, 2010 AT 3:58 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,244 POSTS
It sounds like a bad shift solenoid. I would have that checked first.

Let me know what you find.
Joe
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Monday, October 11th, 2010 AT 11:14 AM

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