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My wife is on a solo road trip in our 2017 Canyon with Duramax diesel. I’m an overkill guy for preventive maintenance. I thought the battery was turning over the engine a little slow in February and with the truck and battery being 4 years old I decided to swap out the battery for a new one. Everything was fine until my wife began her solo road trip. She stopped for a bathroom break about 400 miles in. She came back out and the engine turned over maybe one turn and then was done. Right at that point I got the onstar error message via email, “The battery in your 2017 GMC Canyon is critically low. Start your vehicle as soon as possible and let the engine run to charge the battery.”
No error messages were indicated before that in the DIC.
She got a jump start and continued 200 miles to the hotel. After arriving at the hotel it started right up. She called AAA who came out and tested the battery. Here are the results:
So, the next morning it started right up. She went to Autozone and asked them to replace the battery. They tested the battery and charging system. Again, they told her everything is normal. All they said is the idle charge was initially low at 12.6 but it popped up to 13.1 quickly. But, as we know, that is likely normal for these computer controlled alternators.They also talked her out of replacing the battery.
She left Autozone with a very nice jump pack.
I explained to her how to check the charge in the DIC. It was up to 14.5 while driving.
With all systems seeming normal, she is back on the road. Im headed out to meet her with a new battery and alternator. I was surprised the new OEM alternator was only $180.
Anyone ever had such a weird occurrence, the battery charge dropping so low with no logical cause? She was driving on the interstate and only left the truck off for about 10 minutes.
No error messages were indicated before that in the DIC.
She got a jump start and continued 200 miles to the hotel. After arriving at the hotel it started right up. She called AAA who came out and tested the battery. Here are the results:
I wanted them to replace the battery but they talked my wife out of it. I’m surprised they said nothing about the 66% state of charge.BATTERY TEST
GOOD & RECHARGE
The battery is not fully charged, but is considered to have useful life remaining. Charge per manufacturer’s specifications before returning to service.
State of Health: 100 %
State of Charge: 66 %
Voltage: 12.49 V
Battery Type: AGM SPIRAL
Set Capacity: 300 CCA/SAE
Measure Capacity: 662 CCA/SAE
OCV: 12.49
SYSTEM TEST
CRANKING VOLTS: 10.84 V NORMAL
ALT. IDLE VOLTS: 12.55 V LOW
ALT. LOAD VOLTS: 13.31 V NORMAL
DIODE RIPPLE: 0.08 V NORMAL
Click to expand...
So, the next morning it started right up. She went to Autozone and asked them to replace the battery. They tested the battery and charging system. Again, they told her everything is normal. All they said is the idle charge was initially low at 12.6 but it popped up to 13.1 quickly. But, as we know, that is likely normal for these computer controlled alternators.They also talked her out of replacing the battery.
She left Autozone with a very nice jump pack.
I explained to her how to check the charge in the DIC. It was up to 14.5 while driving.
With all systems seeming normal, she is back on the road. Im headed out to meet her with a new battery and alternator. I was surprised the new OEM alternator was only $180.
Anyone ever had such a weird occurrence, the battery charge dropping so low with no logical cause? She was driving on the interstate and only left the truck off for about 10 minutes.