2000 Sierra 1500 4.3 transmission question?

4l60e overhearing warning came on dash right when the truck didn’t want to change gears. I immediately pulled over. Trans fluid is full and there’s no leak and transmission was fully rebuilt in Jan. New harness new solenoids new everything by a shop. I have a new radiator and there’s no signs of leaking. I have warranty but any ideas?

2 Answers

  • Anonymous
    3 months ago

    With the transmission not shifting the most likely cause is an internal fault  with the torque converter.  Take back to the transmissiion shop for warranty repairs.

  • 3 months ago

    Plugged radiator passages. Radiator flush.

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