Traction control/advancetrak engages randomly

[KITTstang]

2010 Mustang GT
Wheels: 19-10.5s front, 20-10.5s rear
Tires have the same revolutions per mile, 755.
New motorcraft clock spring and steering angle sensor calibrated with a Snap on Solus.
Car is also calibrated for larger tire size.
Issue: when driving, the traction control and advancetrak randomly kick in for no reason. This is traveling at 45mph in a straight line. The only code it keeps throwing is C1278 for steering angle sensor 1 and 2. When watching the data display on the scanner, it shows correct rotation in one PID but in the “degrees clockwise” it never resets to 0 when the wheel is centered. It just continues to add clockwise degrees. All speed sensors are reading correctly according to the scanner. The harness at the rear is also not melted as others have found. No other codes present.

 

[86GT351]

Check the ABS harness and Module for Water Intrusion. Calibrate the ABS module. Few things to check

 

[Autokyrios]

Not sure if the steering-wheel plays into the traction control system. My understanding is that the TCS functions off wheel speed sensors and torque response. There's people with better knowledge that may chime in. However, in normal troubleshooting logic, I'd focus on what was changed. Doubt the clock-spring is the issue, it's just a method of connecting spinning wheel to static console. Maybe check that steering angle sensor? Sure it's the correct one and good? Sounds like it's talking a different range than the car expects.