2018 Terrain battery replacement

My duaghter's terrain (2018, 1.5turbo, equipped with start-stop 40k) has been sending SOC notifications by email. She was down with the China flu, so she didnt drive it much for almost 2 weeks. She had no trouble starting the car The battery tested weak, so I replaced it with an AC-Delco AGM as was originally equipped. The car has sent her another battery message since replacement. Is there a relearn that needs to be done? I have a Snap-on Solos Edge, but it is at work and I was off this week. She is back to driving the car daily, and has had no other issues.

The GM procedure for battery replacement does not note any relearn after reinstallation of the battery. Digging around, I did find this under Battery Sensor Module Learn:

Calibration Procedure
Note: To complete the Battery Sensor Module calibration, there must be no significant parasitic electrical drain on the battery. If the parasitic electrical drain does not remain below 100 mA during vehicle rest, the calibration will not be completed successfully and Start/Start system may not operate. Refer to Battery Electrical Drain/Parasitic Load Test

Starting with 2017 model year vehicles with Start/Stop, a new feature called Power On Reset was incorporated. With the addition of this feature the Battery Sensor learn procedure is no longer required after a battery disconnect/reconnect.

Note: The vehicle will continue to use an estimated state of charge until the vehicle sits for the three hours and then it will start using the actual state of charge value. The Stop/Start system will function normally before and after the learn occurs and will be seamless to the customer.

I would guess that the vehicle has indeed sat for more than three hours at least once over the course of a week. :silly: But I thought it was interesting, and worth noting.

Do you have access to a scan tool that can look at the Stop/Start data list in the PCM? It'd be interesting to see what the PCM thinks the SOC is. And look at any stored codes.

Interesting. I have a Snap-On Solus Edge with 18.4 software, but have never had it connected to the car. I will bring it home next week and update you on my findings.
Thanks for thr reply.