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Transmission wont shift into 3rd or overdrive

Transmission wont shift into 3rd or overdrive

Postby ozzie4208 [OP] » Nov 21 2012, 2:45am

HI I bought my old company work truck about 6 months ago. It is a 2007.5 sierra 1500 extended cab with the 4.8 with auto trans.
About 2 weeks ago I was getting on the freeway and it shifted from 1st then 2nd and then like it was in neutral. I got off the freeway and it will only go into 1st and 2nd. transmission fluid is good. what else should I be looking at.
Thanks Ozzie
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Transmission wont shift into 3rd or overdrive

Postby Machster69 » Nov 21 2012, 2:54am

Possible solenoid issues, any codes?
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Re: Transmission wont shift into 3rd or overdrive

Postby ozzie4208 [OP] » Nov 21 2012, 2:55am

The check engine light is on, its at my work right now. I will pull the codes tomorrow.
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Transmission wont shift into 3rd or overdrive

Postby Machster69 » Nov 21 2012, 3:01am

Yup, good start
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Re: Transmission wont shift into 3rd or overdrive

Postby ozzie4208 [OP] » Nov 23 2012, 3:34am

OK I was finally able to pull the codes from my truck. They are P0121 and P0171. Any Ideas if they could effect my tranny?
Thanks Ozzie
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Re: Transmission wont shift into 3rd or overdrive

Postby castlebravo » Nov 23 2012, 3:41am

P0121 is a throttle position sensor and the P0171 ha to do with the engine running too lean
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Re: Transmission wont shift into 3rd or overdrive

Postby GM Customer Service » Nov 25 2012, 11:56pm

Any luck getting this addressed since your last post, Ozzie?

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Re: Transmission wont shift into 3rd or overdrive

Postby ozzie4208 [OP] » Nov 26 2012, 12:26am

Not yet, I think I will try replacing the solenoids in the transmission first. If that doesn't work then I guess its time to have it rebuilt.
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Transmission wont shift into 3rd or overdrive

Postby SilveradoSweetheart » Dec 04 2012, 1:33am

I've been having a similar issue with my 2007.5 Silverado. My check engine light will come on periodically and the only codes are for a lean fuel mixture. It'll shift perfectly fine then all of a sudden not want to shift into 3rd/4th and when of shifts into second it slams into gear...also feels almost like someone hit my rear bumper when I slow down quickly to a stop. I've been trying to figure this out for awhile and it's really got my stumped. Thought it might be the aftermarket ram air intake but everything seems to be in order (ESP the mass airflow sensor). Any thoughts is to why this is happening would be greatly appreciated!
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Re: Transmission wont shift into 3rd or overdrive

Postby ozzie4208 [OP] » Dec 04 2012, 2:04am

I haven't had a chance to change the solenoids yet. I thought I would try that first before a tranny rebuild. My check engine light has been doing the same thing for a couple of years. be on for a day then go out and not come back on for a month or so. I also have a K&N intake system. If anyone has any other ideas that would be great.
Thanks Dave
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