NHTSA Complaint #11487161 — 2017 CHEVROLET TAHOE

About 3 weeks ago my vehicle began shuddering during acceleration only at low speeds, and I had an appointment to regularly scheduled maintenance next week and planned to have the dealer look at it during that appointment. However, 3 days ago, at about 84,479 miles I was merging on to the highway and when I attempted to accelerate to highway speeds the tachometer jumped to 6000 rpm’s and became very sluggish when accelerating. It calmed down, but shortly after calming down, the tachometer spiked again to around 4500 rpm’s at 70mph, the check engine light came on and the vehicle temporarily stopped responding to any input except to raise the tachometer reading. After shifting into manual and back into automatic the transmission reengaged but would not allow for normal acceleration. The vehicle was able to be driven at approximately 30-35mph while the tachometer stayed consistently at around 3500-4000 rpm’s. The trouble codes given were P0700 and P0796, both relating to transmission indicating a problem with it.