Still P0894 (transmission component slipping) after rebuild and a refurbished

laborde2122 · December 23, 2019

I blew a tranny line on the highway about 4 months ago in my Chevy 2006 Silverado 5.3l. I decided to have it rebuilt with a 3 year warranty.

After I got it back, it would drive fine then shift rough after I came down from highway speeds. When I turn off the truck and restart it, it shifts fine. After I get back up to higher speeds and come down, it acts up and shifts rough again. Eventually it threw the P0894 code. The code is for transmission component slipping. I took it back and he said it was a sensor or something. Next day, hard shifting and code again. He said it must be something else with the tranny and fixed fixed that. (Sorry I don’t remember both of these repairs, but I can find out). Couple days later, same code and rough shifting. He replaced the tranny this time with a manufacturers refurbished. Next day, same code and same rough shifting after highway speeds, but in addition to this, a message appeared saying Transmission Hot.

Thoughts? Haha. I’m lost and I think my transmission guy is as well at this point.

Edited December 24, 2019 by laborde2122

sefiroxx · December 24, 2019

Be sure to post code description when posting codes, no one has them memorized.

The computer controls the timing of gear shift based on input from rpm, tps (desired speed), road speed, and current gear. The code is generated when road speed and rpm vary from each other when gear and tps are stable. If one of the sensors are going, then gear shifts would be off.

Use a scanner to monitor the sensors and see what is different than from normal.

As for heat, try pulling and connecting the wire harness.

davester · December 24, 2019

As well, check that the transmission cooler lines are getting warm/hot. If they aren't (after driving around for sometime), then the cooler is plugged.