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4l80e stuck in first gear

Jonathan Mantilla
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Jonathan Mantilla New Member

Jonathan Mantilla

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Hello everybody, I’m really stumped on this issue I’ve been having on my 4l80e, it’s a 1989 c1500 with a 5.3 ls and 4l80e, the transmission has its own stand alone harness, it was working fine for about a year until one day the transmission did not want to shift, the trans ecu is reading tps , rpm, speed perfectly fine , the transmission is not shifting , only reverse and drive works, cannot manually shift, if I power off the trans ecu the transmission will just got into limp mode and stay in 2nd gear , I’m confused what the issue could be? Any help will be appreciated

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