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From what I am hearing...the first TSB was a way to direct dealers to target specific components for replacement. Those components were sent to the engineers for testing and inspection. Now that they have been able to inspect & test these suspect components they have found they root cause. If it does turn out to be a reflash or new ECU then it was never a mechanical issue.
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2020 GMC Canyon Denali Duramax, 2021 Forester Sport, 2000 Subaru Legacy B4 RSK 5MT (JDM Import) and random 86 chassis rebuilds....
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