4l60e transmission problem

Chevrolet Silverado 1500 2007 lt crewcab 4.8 214696 miles
Bought the truck used, it ran fine for bout a year then transmission starts acting strange. Wouldnt shift out of second gear, troublecode po967, low voltage shift solenoid b. I changed that still no imporovement. Changed ignition switch cuz everyone was saying it had a voltage drop at the switch, still didnt fix it. I found a bad ground wire so i fixed that, kind of improved but now the speedometer doesnt work sometimes and when it isnt working it wont shift out of second gear. But when it is working i have to shift manually for it to work correctly other wise when taking off from a stop it will start off in 3rd gear. Troublecode still only shows p0967. One other thing aotomatic door locks dont work
youngblood48 from United States 4 years ago  
YO
1 report 
V Drive from United States 2 months ago
Exactly! Replaced trans, worked a few months then 2nd gear, replaced input speed sensor twice and entire ignition.
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