Transmission problems

2016 Toyota tundra 5.7 eng 4*4 no check on dash, when start the truck and shift all gears inplace shifts normally after warming up D gear late engagement with big sound like hit from behind, connect scanner and drive for 20 miles scanner showed p0766 current ,p0756 pending, p0776 pending, p2714 pending and p0766, I hav the Trans fluid flashed and still the same
Any opinion or Idea about this are welcome

 

Codes indicate issues with solenoids. You may need to get a transmission shop to test all 3 solenoids for resistance, i do believe they can do it from the outside. Worst case they will need to drop the pan and replace these solenoids. If you got the transmission flushed this may be the cause for additional problems. Most people recommend the drain and fill method over time for transmission service.

 

I flashed after the proplem

 

Yeah I understood that, but the solenoid electrical connectors may be damaged, coming loose or the solenoid have failed all together. I may lean towards they've failed since you have a code and a pending code, it's usually a clue.

 

SL1 solenoid replaced and problem solved, truck running smooth , everything seems to be ok. Thanks everyone.