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1999 GMC Yukon Denali Question: engine replacement leads to no 3rd or 4th gear ?

 

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backyard mechanic 469, Ashtabula, OH, December 06, 2012, 14:33
 Rookie

i just put a new engine in a 1999 gmc yukon denalie it has a rebuilt transmission with less than 500 miles on it , i left the tranny in the truck dureing removeal and installation of the engine i have checked for broken wires with no luck and nothing is unpluged 1st and 2nd work fine but when it shifts to tird it's ike yo put te truck in neutral any suggestions ?

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  • Answer #1

    Greg's Orange Auto (13485 Answers) , Orange, CA - (714) 361-9386
    globalhelper December 06, 2012, 16:16
     Master

    do u have a ck eng light on

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    backyard mechanic 469, December 07, 2012, 11:35
     Rookie

    yes but all the obd2 scan tool pulls is a cam shaft position sencer , no tranny codes at all even after test driveing 3 times to see if issue was resolved

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    globalhelper, December 07, 2012, 12:36
     Master

    that will cause serveral issues seek complete diag from your mech

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