Trac control active when turning

[Chillrtech]

Hi All, Thanks for your help joining Rick. I just picked up a used 2018 XLT. Bought it as-is with a known issue. I thought it would be easier to repair! The traction control will activate just for a moment when I turn a corner but works ok in straight driving. I have flashed the PSCM and ABS to factory. Steering angle appears accurate and offset adjusts while driving. If I deactivate Traction control, problem disappears. Any ideas to fix? I'm not 100% certain of the logic/inputs that activate the TC. Oh, wheel speed sensors all track well (same speed straight, variation when turning) some are new, and the magnetic rings are intact.

 

[FordFlintrock]

Welcome aboard Dr. Freeze.
Put your display in power divide mode which shows amount of power to the front/rear axles. Our vehicles are FWD with clutch applied rear axle. Under normal driving and normal mode just come on a bit for the rear axle. How does yours behave?

 

[Chillrtech]

Welcome aboard Dr. Freeze.
Put your display in power divide mode which shows amount of power to the front/rear axles. Our vehicles are FWD with clutch applied rear axle. Under normal driving and normal mode just come on a bit for the rear axle. How does yours behave?

Seems normal, mostly front, rear illuminates during takeoff

 

[Chillrtech]

Drilled & tapped the PTU to change the oil.. it was fairly dark. Trac control issue remains only when turning the wheel. When I run live data, the connection drops when the trac control activates. Could it be a communication failure? I did get an intermittent DTC for comm failure on TCU. Considering popping out the clockspring to have a look? any other thoughts?