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we installed a used transmission and when we started the car the check engine came on and we got the code P1790

Vehicle: 2014 Chevrolet Spark
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How do u fix ur problem?

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Best answer
P1790 Transmission control module checksum

You need to reprogram the TCM (transmission control module)
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P1790 Chevrolet Code - Transmission Control Module Checksum
Read more: https://www.autocodes.com/p1790_chevrolet.html

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