1G W4A33 not shifting and buzzing while in drive

[blujeans]

Here's the story. I was driving normally when I came to a stop light, all of a sudden the car feels sluggish as hell. Towed the car home and tried to figure out what was going on, and when I put the transmisson into reverse I can hear some buzzing for a second from the area below the air filter, and then into drive which is where it becomes constant. I changed the fluid and filter using Redline D4 ATF about 120 kilometers ago and the fluid level appears to be where it should. Any advice?

 

[motomattx]

Are you checking the fluid right? with the engine running warmed up in neutral? the buzzing is normal, it should go away when you touch the gas pedal. It might be defaulting to third gear if there is a hard part failure.

 

[blujeans]

I checked hte fluid with the tranny in neutral and warmed up, but I think I forgot to run the car while doing so. I also checked the TCU diagnostic pin and it was just constant short pulses so worst case I just need to put some more fluid in.

 

[motomattx]

The problem is that running it low on fluid can do damage to internals, even for a short time.