GPS Drift after coding in ACC

Hello,

After Ive used a guide for adding some features for ACC it, my GPS drifts a bit and occasionally it wanders off by about 200m, which throws a lot of traffic sign errors.

What Ive changed (and reversed): traffic lights online, pacc learning drivers offset.

I reverted the settings and tried to reset the personalization settings which throws an error "Function cancelled, disruption in control module".

Any recommendations?