In my case, I have got a new OVP and the same problem remained, I have also removed the bottom cover with little or no difference. It is mainly the heat that builds up under the hood when parked or in slow traffic that causes the bad signal. i have also looked into the throttle linkage and reprogrammed the CPU without success. It leaves no fault codes at all....

Btw, if I can build up the limp home speed enough to engage the cruise control, it will override the limp setting and usually the car cools down enough to work normal again pretty soon...