2015 Fiesta St outside temperature reading wrong

[FiestaSTRGV]

my Fiestas ambient temperature reading drops to below 30F when its well in the 90s then my AC stops blowing cold air. if i unplug the battery for a while it resets and temperature reading works for a bit. i have replaced the ambient sensor in the front grill but still has issue. if anyone knows of a solution i would greatly appreciate it.

 

[phez]

I have the same issue. Did you resolve it?

 

[Intuit]

Voltage drop test between various grounds and battery. All circuits must be fully loaded in order for the test to be effective. Disconnect any/all aftermarket additions until the issue ceases. For example, I had intermittent issues with delayed wiper malfunction on turn signal activation. Turned out the aftermarket LED headlights were dumping a bunch of noise off the ground, which messed with BCM (Body Control Module) function.