2018 Mazda CX-5 Various Electrical Issues

[RedBaron]

I seem to recall seeing on here that there was a known problem with the liftgate mechanism draining the battery. I'll see if I can find it.

UPDATE: This was what I found, but may not apply to your car: https://static.nhtsa.gov/odi/tsbs/2020/MC-10180692-0001.pdf

 

[SparkYellow]

For my 2017 CX-3, the original battery started to act out in 6/2023. Over the span of a couple of months, every time I finished loading/unloading from the hatch, the car would need to get jump-started. The hatch mechanism seems to draws quite a bit of wattage when left unlocked for more than half an hour, but a good battery would have enough juice to accommodate it.

My replacement battery from AutoZone failed in two years.

 

[calmad55]

Ah, great, thanks for this. This makes sense then aligned to that recall, I suspect its a combination of malfunction of the PLG control module not going to sleep/power saving mode despite ignition off and it's sucked the life out of the battery (quickly, given the large draw from the battery).

After reading that recall and further googling, seems a parasitic draw from the battery linked to the PLG module isn't uncommon