I think my ECM is taking a crap on me lets see I've been throwing a few codes for about 6 months map sensor voltage to low and too high and air intake temp voltage too low truck has been running fine until last night my check gauges light came on and my voltage dropped threw a bunch of codes but I think because the system was not charging properly hooked it up to jumper cables and it runs fine as if nothing is wrong with it other than not charging have its got year old battery's and altnator is the Same all got replaced at the same time anybody have any suggestions on where I should go from here thanks fellas

 

Wow no one helped ya? a bad connecting ECM can be because of a bad ground, or bad battery connection?