Hi all...I have an '03 Yukon XL 1500.
Sometime last week, the alarm went off and I could not shut it off. In the past, I have accidentally hit the horn alarm icon on the key fob, but pressing the button again, always shut it off, but not this time. After a few minutes, it just stopped. I had also noticed the key fob was intermittently not opening the doors and had to insert the key into the lock. I also noticed a little drag on the starter when turning on the ignition, but all these random incidents seemed to clear up...until yesterday. I put a new battery in the key fob, just to be safe. When I jumped in the Yukon and put the keys into the ignition, turned the key, as if to start the engine, nothing happened. No dash lights were on either. The battery was over 5 years old, and only had about 11 volts when I used the meter on it, so I pulled out the old one and bought a new one. Same specs, except instead of 800 CCA, this one was 700 CCA. I'm in AZ, so it's not cold.
The old battery was disconnected overnight. Once I installed the new one the following afternoon, I turned the key in the ignition, all the dash lights, et.al lit up, but when turning the key to the final forward position, intending for the starter to work, nothing happened. I have read and tried all the "quick fixes" and so far, none of them have worked. So I left the new battery connected and called it a night. The next morning, the battery was drained down to 8.3 volts! I don't recall leaving any interior lights on and no dash lights were on over night. I have no idea what caused this? So I was able to return the new battery for another new one. So now after hours of trying to troubleshoot again, I noticed the Daytime Running Lights were now staying on, after trying to fix this, so I pulled out it's fuse from the fuse block to preserve the charge in the new battery, rather than mess with the electric system by leaving it disconnected for another extended period of time.
Then, I bought an OBD reader, thinking with this, I could at least see what's up, but after numerous attempts to retrieve error code data, the reader failed to download any potential error codes, each time resulting in "ERROR". (Yes, the key in the ignition was in the "on" position and dash lights, et. al turned on.) The app for the phone connected with the reader via Bluetooth, but there was nothing for it to download and present to me.
Anyone have any idea what's happening here and how to fix it?
UPDATE: after walking outside, to check things, because I left the new battery connected, all lights, except headlights, were on, even dash lights were on. I had no choice but to once again, disconnect the battery.
Sometime last week, the alarm went off and I could not shut it off. In the past, I have accidentally hit the horn alarm icon on the key fob, but pressing the button again, always shut it off, but not this time. After a few minutes, it just stopped. I had also noticed the key fob was intermittently not opening the doors and had to insert the key into the lock. I also noticed a little drag on the starter when turning on the ignition, but all these random incidents seemed to clear up...until yesterday. I put a new battery in the key fob, just to be safe. When I jumped in the Yukon and put the keys into the ignition, turned the key, as if to start the engine, nothing happened. No dash lights were on either. The battery was over 5 years old, and only had about 11 volts when I used the meter on it, so I pulled out the old one and bought a new one. Same specs, except instead of 800 CCA, this one was 700 CCA. I'm in AZ, so it's not cold.
The old battery was disconnected overnight. Once I installed the new one the following afternoon, I turned the key in the ignition, all the dash lights, et.al lit up, but when turning the key to the final forward position, intending for the starter to work, nothing happened. I have read and tried all the "quick fixes" and so far, none of them have worked. So I left the new battery connected and called it a night. The next morning, the battery was drained down to 8.3 volts! I don't recall leaving any interior lights on and no dash lights were on over night. I have no idea what caused this? So I was able to return the new battery for another new one. So now after hours of trying to troubleshoot again, I noticed the Daytime Running Lights were now staying on, after trying to fix this, so I pulled out it's fuse from the fuse block to preserve the charge in the new battery, rather than mess with the electric system by leaving it disconnected for another extended period of time.
Then, I bought an OBD reader, thinking with this, I could at least see what's up, but after numerous attempts to retrieve error code data, the reader failed to download any potential error codes, each time resulting in "ERROR". (Yes, the key in the ignition was in the "on" position and dash lights, et. al turned on.) The app for the phone connected with the reader via Bluetooth, but there was nothing for it to download and present to me.
Anyone have any idea what's happening here and how to fix it?
UPDATE: after walking outside, to check things, because I left the new battery connected, all lights, except headlights, were on, even dash lights were on. I had no choice but to once again, disconnect the battery.
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