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Tiny
JENASHURST
  • MEMBER
  • GMC C1500
I have a 2003 gmc sierra 1500 2wd 4.8 and im having trouble with shifting. Its an automatic 4speed. I can not get it to shift into 3rd gear. It goes into 1st and 2nd gear but wont go into 3rd gear. I will put it into driveand when it gets to 3rd gear it goes into nuetral. Sometimes I can get it to catch 3rd then it goes into 4th fine. Please help
i had it scaned and the two codes that came up are;
P0220 TP OR APP SENSOR 2 CIRCUIT PROBLEM
P0120 TP OR APP SENSOR 1 CIRCUIT PROBLEM
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Friday, May 12th, 2006 AT 5:31 PM

1 Reply

Tiny
LOSONE
  • MECHANIC
  • 1,616 POSTS
You have a problem with the solonoid pack inside the transmission. Take it to a transmission expert as they are kind of tricky to replace. Good luck
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Saturday, May 13th, 2006 AT 2:25 PM

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