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I took my jimmy to a transmission shop, they diagnosed it and said the transmission was fine, but that an electronic piece that was some kind of cap was bad and it caused the tranny to not shift properly. I cannot remember the name of the part, I know that i looked it up right after that and found it in the repair manual, and it looked almost like a distributor but with an electronic module and several wires. Now a year later I want to actually fix mine and cannot remember what the part was...

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Q: Why does a Transmission not shift with check engine light on?
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