I have a problem with my Van . I have a message Service Vehicle Soon on my info

B1516 was code sent . I have tested connection and found above readings. I just don't know where to go from here . I suppose the dealer with there Tech II scanner . I Think they made this system for there benefit . Consumer has no way of accessing this BCM .

Ok, That is most commonly a bad battery, and based on the 10.3v measurement it sounds like the battery sensor is telling you the voltage is below the lower threshold of 11.5 volts.

I had a charging system failure back in April. The lights would dim every time I took my foot off accelerator pedal . Found a bad battery connection and fix that had alternator tested was good . Van died while driving home from work . System went to power save mode and shut down . SO I changed the Alternator put new cables on replaced battery changed battery current sensor . All this and shortly after revived code B1516 . The battery current sensor came in two voltages 5V or 10 Volt this voltage is what activates the magnetic coit in the battery current sensor it is a hall effect monitors voltage at ground cable. Mine is a 10 v which is why the connector reads 10.3 on both inside terminal and outside which I was told was correct voltage . The wire in center is .17 to .19 which is the read from hall effect to BCM this should be .23 to .25 . Thats the problem and I do not understand why this is out of spec. I am going to take to a Chevy dealer so the can read exactly why this voltage is wrong I will post outcome so we all know .

Are all of the negative battery cables connected to the battery running through it?