vortec 6.2L big trouble

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vortec 6.2L big trouble

Postby Cheyhigashiguchi » Fri Aug 14, 2020 6:43 am

Last month the check engine light on my sierra came on, I took the truck to a mechanic. He ran a diagnostic check which showed that the knock sensors were bad. He reset the light and it stayed off for about 50 miles but came back on after hard acceleration.
I replaced both knock sensors and the harness. I went to a shop and a mechanic reset the check engine light.
I drove the truck for about 60 miles and the light stayed off. The light came on again after hard acceleration. I bought an auto scanner, it says that transmission check is incomplete, check the harness.
I believe that the powertrain control module may be bad.
I have checked the wiring and connectors, everything seems good. Guys, I really need help. What am I to do to finally reset check engine light on gmc sierra without further incidents?
Production year 2011, 1500 Denali AWD, Vortec 6.2L V8

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