2006 Sierra

Tiny
RBAMSTUTZ
  • MEMBER
  • 2006 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
My 2006 1/2 ton Sierra wont go in D but will go in 1 and 2, what could be wrong?
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Saturday, January 22nd, 2011 AT 1:21 AM

6 Replies

Tiny
DRCRANKNWRENCH
  • EXPERT
There is a safety lock out that will not allow you to put the truck into drive on some models not even move the shifter out of park.

There should be an override around the shifter with a small cover that you remove and use your key to disengage the safety lock.

There may be some variances in the safety lock out that they are generally time to the brake pedal.

Push on the brake pedal and see if you can hear something moving in and around the shifter. Also look around the brake pedal for a linkage arm which can be worn or out of adjustment causing this problem.

I hope this helps.
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Saturday, January 22nd, 2011 AT 5:29 AM
Tiny
RBAMSTUTZ
  • MEMBER
I can move the shifter, and the vehicle will go when first of seond gear is selected.
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Saturday, January 22nd, 2011 AT 5:41 AM
Tiny
HMAC300
  • EXPERT
I think what you are maening here is that it will shift into 1and 2 while drivign but not into Drive. If that s the case then taek it to a trans guy as it may be a shift valve bad or a wiring problem. He can scan it and see if everything is ok with it or not. It also could be a trans problem as well like a clutch or seal bad.
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Saturday, January 22nd, 2011 AT 3:14 PM
Tiny
DRCRANKNWRENCH
  • EXPERT
I did misunderstand. I hope I did not cause you to waste any time. Hmac is the expert and I thank him for the help.
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Saturday, January 22nd, 2011 AT 6:37 PM
Tiny
RBAMSTUTZ
  • MEMBER
No problem, I do have more info if you would like to know. When shifting the transmission manually it works normally in first, slips a little in second and locks up in third. Overdrive is the same as neutral. I took it to our local GM dealer this morning, but I won t have any further detail until Monday afternoon. If you wish I can pass along their findings.
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Saturday, January 22nd, 2011 AT 7:38 PM
Tiny
HMAC300
  • EXPERT
It sounds as if the trans is toast. Especially with the slippingpart. And Overdrive not working. You didn't need to takeit to a dealer, thereare many qualified independent trans shops around as well.
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Saturday, January 22nd, 2011 AT 7:47 PM

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