Question about 1994 Chevrolet C1500

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Code 43 when it shifts into 2nd it falls on its face, unless you stomp on it. Service engine light is on computer is reading code 43

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  • yadayada
    yadayada May 11, 2010

    DTC - 43 Knock sensor error

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Should clearify by providing engine info. However, this will likely be what you need...

Code 43:
knock sensor or electronic spark control circuit fault

Posted on Jun 25, 2009

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I have a 42re trans (4x2). My previous trans would always pull out in 2nd gear shifting regular thru the rest. Rarely did it pull out in 1st gear. Eventually the trans went while on the highway. Vehicle...


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nor years of all parts swapped.
swaps are super complex topics, endless possibles.

dont expect magic from any TCM.
they cant tell you ever possible way things can be wrong
it will fail to shift right if things are wrong,
the trans TCM can go to limphome mode, read the service manual chapter 21 yet its free, posted here 300 times.
forget the silly engine , light (CEL) use only a scan tool one that can read all factory codes not some $20 tool.
CEL lamp is for failing smog. only. never trust it, if out.

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all inputs to the TCM must be correct for the shift to 2nd happens.
check all inputs.
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solenoids have many failure mods
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stuck open, valve open.
or leaking. (leaking can cause stuck in 1st and confuse any TCM)

leaking means breached, valve leaks where it must not. ever.

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