Code po894 - 2006 Chevrolet Silverado 2500HD 2WD

Clutches burnt needs rebuilt if clutches fry there's no grabbing it

Direct drive clutch plates need to be replaced. Take it to a tranny shop.

Torque converter clutch fluid diagram, check transmission fluid

TRANSMISSION SLIPPING.

Code 894 is for a problem with the torque converter or the flow of fluid inside the transmission.

transmission component slipping
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That could be something like the wrong fluid in the tranny or it could be time for an overhaul. Depends on the mileage and use

This one could be any of them. If you tackle this yourself start with the cheapest and move to the most expensive. The other way is to take this in for a diagnostic, pay them for that, and then fix it yourself knowing what it is for sure.

P0113 - related to Intake Air Temperature (IAT) circuit
P0894 - related to transmission slippage detected

what is trouble shooting code po894 for 2005 chevy avalanche