Screeching sound when accelerating

[Wats_in_a_name]

Hi All, I've got a bit of an issue from time to time with my VZ Exec. Sometimes when I pull out to overtake on country roads there is a screeching sound that seems to come from the middle of the car when I first accelerate. Does anyone have any idea what this might be? Only seems to happen at high speeds on country trips and doesn't happen at all in city driving

 

[ant797]

Im only guessing something to do with your torque converter run a scan and see if there is any torque clutch control codes

 

[krusing]

Could even be the serpentine belt is stretched to its max length,
where a pulley also maybe be faulty and the bearing is starting to seize up, causing the belt to slip.