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Posted

2018 Sierra Texas edition. 5.3l v8. Just put a remanufactured transmission in and when you put it in any gear the throttle doesn't respond. Throttle works in park and neutral. Any ideas?

Posted

Yup, the transmission has to be flashed with the correct file that matches the PCM calibration in the truck.

 

Either a GM dealer or some aftermarket software can do it.

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