ok so my tach has been dropping for two weeks, didnt check codes, just replaced cam position sensor....I mean really why check codes, only two obvious things could cause that and have never replaced the cam sensor so figured it was time....pull out of shop and drop tach again and throw a code..... do the key thing and get a P0122 which is apps voltage....

do i have a bad wiring harness or is my ecm about to give up the ghost....the two shouldnt be related should they??

truck is same as in tag line

thanks

Tim

 

Seems to be tied to outside temp.... below 50 and I drop the tach and throw codes.... above 50 it's fine.. When the tach drops the alternator continues to hold a charge.... ANYBODY with some feedback on this??