Battery went dead due to inactive use for extended period. Charged at low
rate using the remote battery terminals in engine compartment. Got battery
to about 9 volts and tried to start. engine turned over but weakly. Hooked
up my trucks battery to remote battery terminals and tried to jump start.
Again engine turned over but did not seem to be turning over strongly.
Decided to remove battery to take in to have tested. After I got battery out I
decided to charge some more and got to a 12 volt charge. Put battery back
in and now I have no electrical at all. Can you help please ?
Step 1. Replace battery with new battery. the low voltage disrupts the entire system! Wait this is 2013 under warranty? check the dealer. 3 yr/36,000 mi basic, 5 yr/100,000 mi powertrain
Once you remove a battery from a late model vehicle the BCM looses all of the factory and owners presets, in more extreme cases it totally shuts down and none of the accessories will work, when this happens the vehicle has to be taken to a GM dealer and the system reflashed to match the vehicles VIN. There should be a warning under battery replacement in the owners manual, I found it in my Yukon's manual. So if you are going to leave it sitting you need to install a float charger to keep the battery alive and if you do have to disconnect the battery for any reason there is a tool, see pic, that plugs into the power port, this is a must have device for anyone working on late model vehicles. I have a later version the plugs right into the OBD2 port that does the same thing only has much longer battery life.
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