P0894 4l80e. When cruising at highway speeds. Despite no felt slippage, faulty pressure regulation can trigger this code. I have a 2005 1500HD 2wd 6. going for a drive and . 0 4l80e . P0894 is a generic code for the ECM detecting slippage. you need a scanner that will read live data and watch the data from the speed sensors and the TCC slippage. The makes the transmission operate at high pressure which leads to rough shifting in 1-2. That’s enough for the T42 to flag P0894 Code P0894 indicates a transmission component slipping, often linked to the 4L80E’s pressure control solenoid or valve body issues. after getting on the freeway and reaching at least 60MPH for 5 to 10 min my engine load and rpms will rise a little and the transmission will begin to A small amount of TCC slip is normal, but ~130 RPM in 4th gear with the converter commanded locked is pretty high, especially on a 4L80E. I get the code P0894 - Transmission component slipping.


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