Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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1680 usually means the PCM needs to have updated programming installed. Check the VIN with TSB 04-06-04-038 for a possible Powertrain Control Module (PCM) or PCM program update, you can call dealership and see if it has been done. P0894 means transmission detected a slip, usually means the solenoid has failed but can also mean transmission is failing. Let me know if you have questions, thanks.
I would start with a transmission flush and replace the torque converter solenoid, if you are having problems still then you are looking at more serious transmission problems that will require rebuild or replacement. Let me know if you have questions or run into questions, you can reply to this answer at any time even after rating without additional fees. Thanks.