that is a discharged battery
Unhooked Battery, now it won't start- Please help! *SOLVED*
- Thread starter Scrapman
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
and just for s@hits& giggles, start checking each fuse, only takes a couple minutes on the top of each fuse is 2 metal tabs, put your meter on continuity and probe each fuse
ya seems weird that it would be higher with the key on than key off, if possible jump it or put it on a charger while checking other things mentioned above
It was higher when I started jacking with it at about Noon today. I have checked all the fuses under hood and in the cab, and even charged the battery with my truck. I have had Zero battery problems until I unhooked it today.
it is like one of the computers (BCM Maybe) turned off and isn't coming back on.
I need to find a shop manual and electrical diagram and dig into them. I have only owned this Tahoe for about a year, but it was well taken care of. The engine is cleaner that my wife's one year old car.
There are a ton of YouTube videos on ways guys got their Theft Deterrent system straightened out. The ones where guys stand on one foot holding their breathe I probably would skip.
One constant in most I scanned was the battery needs to be kept charged, the tow guys all use jumpers during their procedures. I would probably get and keep that battery charged up (should read 12.7+ after a charge). The charge state should be taken with the battery disconnected from the truck or quite a while after shutdown, lots of parasitic drag as things spool down that will look like a low charge state.
The 30 minute key relearn procedure is probably worth a shot.
Last edited:
My security light is Not on. Your saying do the key relearn procedure even though the security light is Not on?
CaptainAmerica1
Full Access Member
Don’t sound so incredulous you’ve tried everything else….
I wasn't trying to, but the key relearn procedure uses the security light going off to relearn the keys. How am I supposed to do it if the light isn't on?
I understand your security light is not on. You told me that before.
What I am suggesting is something in your BCM/PCM is not happy and given you were screwing with components that talk to the BCM and interact with the Theft Deterrent system, perhaps a procedure that resets programming in those modules may clear the state you may have induced.
As I posted before, there are tons of YouTube videos that document n number of ways to reset components in this logic train. One likely will work for you.
good luck.
Last edited:
So make it 13 minutes between off/on/start cycles. Or maybe try in succession the procedures documented in the first 19 YouTube videos that address similar problems.
Without a high end two way scan tool, it is going to be a kind of blind man’s bluff thing.
It is possible it isn’t even a theft deterrent problem. It could be a fried liftgate control module, BCM, PCM, crank relay, etc. etc. etc.
