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

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I have a problem with my Van . I have a message Service Vehicle Soon on my info center .I understand this is a BCM Code had it retrieved says battery current sensor which I replaced prior to the code so I replaced it again . No luck so now I'm trouble shooting the connector which is a 3 wire 1 is current sensor voltage is 10.3 the second is current sensor low voltage which is .17 to .19 which I am told is out of spec should be .23 to .25 and the 3rd wire is current sensor signal which is 10.3 volts . I need some background on what the voltages should be or help determining what the problem is

mikenbambs in Athol MA

Jun 15, 2018

2 Replies

Popular Answer

casey40510on Jun 15, 2018

Hello, What trouble code is set?

mikenbambson Jun 15, 2018

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 .

casey40510on Jun 18, 2018

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.

mikenbambson Jun 18, 2018

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 .

casey40510on Jun 18, 2018

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

mikenbambson Jun 18, 2018

yes

casey40510on Jun 19, 2018

Ok, How are you getting the .17 to .19? Should be backprobing. Also, see if turning on the rear window defroster and headlamps (KOEO) force a change. This is targeting the electrical power management system which is controlled by the BCM.

mikenbambson Jun 19, 2018

Yes I am back probing and as for the voltage my read is 13.3 volts weather I turn on a/c rear defogger headlights high beam it always reads 13.2 volts at charge , but it should go up to 15 volts with everything on after 1 min. or so.

Reply in Thread

luchock123on Apr 8, 2019

I found after buying 3 battery current sensors . I returned to the dealer and was asked if I purchased the sensor from them . The dealer chips there sensor to make them easy read for Chevrolet . That was it bought the sensor and worked right away . They definitely cornered the market with that chip it thing flashing there components .

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