12v drain stopped on Aug 12th?
I got my 2026 C-HR mid May. Shortly after I started reading about the parasitic drain on the BZ and Uncharted subs. I installed an Ancel bm200 beginning in June and confirmed I too had the drain. At the time the fix was to turn off DCM which I did by removing my car from the app. 12v drain stopped.
I never had the battery die. I drive the car 20-60 miles daily. I am located in the US.
August 9th I decided to get an upgraded H5 AGM battery so I could turn DCM back on. I was going to do the charging schedule hack but was monitoring to see what the drain looked like with the AGM. And scheduling wise I was trying to figure how I'd do it cause I change at work and I can't have an interrupt on their charger or else charging stops and won't reinitialize. I'm also on Android so the locking hack was more difficult, I was attempting to vibe code a solution.
Then on August 12th like others are reporting on the BZ/Uncharted subs, the sawtooth drain stopped. it's now been 6 days without drain.
I did see drain on the 10th and 11th after the battery change and turning DCM back on. So I don't think the drain stopped because of a reset of battery/DCM.
My app hasn't updated edit since the 8/3* and doesn't look like the car updated either. The best explanation I saw in the BZ sub was maybe they did a server side up update.
Either way I hope the fix is in and everyone sees an end to it.