"Torque converter lockup clutch has excessive power consumption"

This is what the Mbz code reader shows. It is more detailed than the common reader. The car, 2006 CDI, runs good. I reset the code as I believe it may be a one off. What may have gone wrong? The torque converter or the solenoid? Something sinister or I can ignore?

Btw: car has 320k but runs great.

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.