tim leineke

My 2018 chevy silverado has twice had shifting issues with the tow haul on. It would not go into 3rd geer. Luckily both times i stope removed the battery cables amd the truck shifted properly with tow haul on after that. But the secomd time it happened i was going down the highway. It was acting strange, reving up, not reacting when id push the gas, speed up suddenly then lose power until it wouldnt shift into 3rd. I had to ride on the side of the road, rpms 4 to 5000 until i got off. I decided to pull battery cable , and reattach after about 5 min, everything went back to normal. Im thinking bcm issue, or electrical issue. All cables were tight, no corrosion. Maybe, a corroded ground could be an issue? Im not sure, but it shouldnt happen!