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Old 07-23-2021, 07:29 PM   #1
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Question 2005 Saturn Relay Voltage Drop

I have a 2005 Saturn Relay (3) reporting a B1516.

The battery, alternator, battery voltage sensor all have been replaced, and the terminals on the battery cable have been newly terminated with new terminals.
Service Engine Soon light still goes on, and when code is cleared, the voltage drops from 14.2 to 14.7 regular operating voltage, to around around 12.8 - 13.0 volts.

Clearing the code brings its back to regular voltage, until it fails the test exactly 2 minutes. New battery was tested and found good, as well as the alternator. I am at a loss and hoping its not the BCM. Any hints would be great.
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Old 06-29-2022, 11:23 AM   #2
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2002 L-Series 3.0L Wagon
2002 L-Series 2.2L Sedan
Default Re: 2005 Saturn Relay Voltage Drop

Does this vehicle idle with high electrical load for an extended length of time before the light comes on? Or is it random with no pattern?
2002 LW 300 loaded, just rolled 100,000 miles, new timing belt and goodies
2002 L200/5 Loaded, 280k grandsonís car
2000 LS1, TMU love those bcm failures., grand daughterís car
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alternator, battery, relay, voltage

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