Lightning keeps going into deep sleep, 12v appears fine

[muels7]

Ever since the cold weather started here (teens and colder), my lightning has started going into a deep sleep if it sits for longer than a few minutes. That means that I'm unable to use remote climate start, which isn't great when it is this cold. Also the touch unlock handles don't function and the interior lighting doesn't work until the truck is on. I have to use the fob to get in to the truck because PAAK doesn't function either, at least not to unlock the doors.

I initially thought that my 12v might be going bad. I got the truck synced up with home assistant, and bought an OBDII reader as well to track historical 12v charge and a live rate. From what I am seeing, the 12v never goes below 82% charge, and the average is closer to about 88%. I thought that you usually didn't start seeing these issues until the charge percentage was much lower.

Is it possible that the 12v is going bad even though it appears to be charging just fine?

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[TaxmanHog]

Do you have the welcome lighting feature active?

If you are in the house and moving around with PAAK enabled phone, do you see the trucks lights come on at random times, if so and combined with cold weather and a 3+ year old battery, she might be being pushed to the limits.

I turned that feature off on my truck.

 

[Adventureboy]

Is your 12v battery original? If so, I'd say that is most likely your problem.

I'm wondering if it might be dropping off too quickly for it to be tracked by the OBD2 with your polling frequency. Once the truck sees the dropoff, it will shut down non-essential modules (deep sleep) and charge the 12v, so you may simply be missing that dropoff on your tracking. Also, depending on the OBD2, it may be exacerbating the problem since they keep modules alive instead of normally shutting them down after 30 minutes.

 

[Ncasini]

Ever since the cold weather started here (teens and colder), my lightning has started going into a deep sleep if it sits for longer than a few minutes. That means that I'm unable to use remote climate start, which isn't great when it is this cold. Also the touch unlock handles don't function and the interior lighting doesn't work until the truck is on. I have to use the fob to get in to the truck because PAAK doesn't function either, at least not to unlock the doors.

I initially thought that my 12v might be going bad. I got the truck synced up with home assistant, and bought an OBDII reader as well to track historical 12v charge and a live rate. From what I am seeing, the 12v never goes below 82% charge, and the average is closer to about 88%. I thought that you usually didn't start seeing these issues until the charge percentage was much lower.

Is it possible that the 12v is going bad even though it appears to be charging just fine?

Clean and tighten your 12volt battery connections. You will find that they’re not as tight as they should be. That fixed mine from doing the same thing

 

[dkrueger]

I'm having the exact same issue. I have a 23 Lariat and assumed the 12v was going - I brought it in 2 weeks ago, and they replaced the 12v under the warrantee but I am still having the same deep sleep issue.

 

[TaxmanHog]

Clean and tighten your 12volt battery connections. You will find that they’re not as tight as they should be. That fixed mine from doing the same thing

Wow, the production line continued to not torque the fasteners even in 25, this was a problem way back in 22 production.

 

[Thndrdwg]

I just got home from dealership and my battery failed load test. It always checked health and 100% SOC but their load test immediately failed. New battery should be here Monday, warranty replacement. It's only been 13 months since purchase.

 

[muels7]

Is your 12v battery original? If so, I'd say that is most likely your problem.

I'm wondering if it might be dropping off too quickly for it to be tracked by the OBD2 with your polling frequency. Once the truck sees the dropoff, it will shut down non-essential modules (deep sleep) and charge the 12v, so you may simply be missing that dropoff on your tracking. Also, depending on the OBD2, it may be exacerbating the problem since they keep modules alive instead of normally shutting them down after 30 minutes.

I'm not sure. I have only had the truck for a year, I bought it used. Is there any way that I can tell?

 

[Adventureboy]

I'm not sure. I have only had the truck for a year, I bought it used. Is there any way that I can tell?

Yes, there is usually an "in service" date sticker on the battery. Hopefully it is on the top or the front so you can see it easily.

 

[SSNutz]

Clean and tighten your 12volt battery connections. You will find that they’re not as tight as they should be. That fixed mine from doing the same thing

I can second this. My truck was acting weird, randomly going into deep sleep and one day it was "bricked". Well I thought it might be the 12v so I was going to take it in for testing. I touch the neg wire and the truck came back to life. 10 mm wrench and few turns and never had an issue again.

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