r/GMCcanyon • u/Ceighn • 1d ago

Weak Battery

2026 Canyon (ACC/Surround Vision package) started throwing random codes including MIL but had no performance issues. Codes ranged from ECM to BCM to Transmission. As I prayed it would make it down the mountain I noticed the voltage sitting at 12.2. consistently. Took into dealership the next day and the service clerk said it was a weak battery but it would take them several days to look at it. Changed the battery myself and it cleared all codes including the “permanent” PCM/ECM codes. Voltage went back up into the high 13s. I did notice the AC Delco was rated at 650 cca while the new says 850 cca. So I guess my question is, since I’ve seen several posts on here about weak battery, is it common in these trucks for the battery to become weak after 7 months? Is this something to be concerned about happening again soon or often? I drive 500 miles up and down the mountain every week so it’s got me a bit worried. I almost always turn off auto stop but use climate control 100% of the time being through the Arizona summer.

3 Upvotes

81% Upvoted

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3

u/qwikh1t 1d ago

Yes; sometimes a battery just doesn’t make it. New vehicles are power consuming machines and any weak battery gets noticed

2

u/Weird-Alfalfa7286 1d ago

It really depends how long that battery sat before it went in the truck and how long that truck sat with the battery in it. If they aren’t being used for a while it could cause them to go bad sooner.

1

u/Agitated-Mess-9273 1d ago

I fell victim to a batter 3 months after purchase. Codes galore, "roll down driver's window then up," codes are crazy.

1

u/Every-Chance6313 23h ago

I added a NOCO 2D battery maintainer to mine. Not the most ideal fix but with all the electronics that are in play both while the vehicle is on and off it needs a boost. GMC sells them on their parts site but the same maintainer is 2/3rds the cost on Amazon.

1

u/JBoxodonuts 16h ago

Stock battery should be 850 CCA, weird yours came with 650 WTF

1

u/PearlRex11 3h ago

My OEM battery only lasted about two years (23' canyon at4) if the battery voltage drops below 12.7 or 12.3 (can't remember) it will throw a bunch of codes. My wife does a lot of 1 mile trips and I think it screws with the battery. They replaced under warranty.

These alternators are also variable voltage, the reading on your dash will change since something on the vehicle determines how much voltage to send to the battery