Hello I will help you with your question,
This code means that the computer is not seeing a change in the slippage of the Torque converter when the converter clutch is commanded on. The most likely cause of this code is that the TCC solenoid in the transmission has failed or the wire harness to the solenoid is shorted or open.
In either case the fix is to remove the side cover of the transmission and replace the solenoid and inspect the harness. This is about an 8 hour job and the solenoid is about $50.
Please let me know if you have further questions about this