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I would be interested if the PHEVs that are having this problem are of any particular VIN series or build dates or if they are in similar situations or conditions. My delivery was at end of July and after three weeks, no problems. I charge to 80% only.
 
Okay, lets add to the list. I bought my CX90 this past wednesday and Friday I started to receive an AWD malfunction, the display goes blank, then I had a loud cooling fan sound that lasted all night long and it never charged my vehicle. The moment I powered of the charger and turned it back on the sound will go away and then it will charge. All of this is working intermittently. It goes to the dealership Tuesday, let you know what happens. Wife is upset can't blame her this is the 15th Mazda in the family and I have driven 3 CX9 since they debut in 2007, and we have had no issues, who would have thought. Possibly having to go down the lemon law and buy a Lexus.
 
Finally got my car back today, bought on 8/20, car towed to the service on 8/21 due to multiple warning messages including "Hybrid System Leakage Detected". They have replaced the water heater to solve the issue. Here's the work has been done to the car. We'll see if this finally fixed the issue.
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Hope that fixes it. Since car has a water heater don't think it uses a heat pump. Under dash ac coils and heater core look the same between phev and 3.3l. Someone in France had the same error on their CX-60. 'Electrical Leakage" check out the whole thread:


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I would hope so, if this happens again, I'm gonna go Lemon route to have Mazda buyback.

Hope that fixes it. Since car has a water heater don't think it uses a heat pump. Under dash ac coils and heater core look the same between phev and 3.3l. Someone in France had the same error on their CX-60. 'Electrical Leakage" check out the whole thread:

 
UPDATE on my car, which got this error but was driving fine: got the car back from the dealer five days later. All diagnostics nl. Reset the alert and have been unable to reproduce it on additional testing. So perhaps a sensor/software glitch? Car continues to drive fine now that I have it back
I got the same error last night and didn’t have any issue driving. I turned it on and off a few times on my way home hoping for the error to disappear but it didn’t. I have to go to work tomorrow. I leased the car 10 days ago and have less than 200 miles on it. I am so upset to read that this isn’t uncommon.
I have to go to work tomorrow and hopefully it’ll work, but will call dealer in the morning. I hope it disappears like yours and stays gone. I understand why they had the 7500 cash back on the lease, now. I should have went with my gut and went with the Hyundai.
 
Just adding my experience to the pile. I leased a CX-90 PHEV at the beginning of June. About a month later, at ~1500 miles, it had a hybrid system malfunction. I tried to start it and it threw a whole series of errors, ranging from "Push button start malfunction", "Charging system malfunction", all the dash lights were flickering and flashing, the brake pedal was "pumping back" at me, like the ABS system was activating for no reason. After a few minutes of that, everything just died. No lights, no buttons, no door locks, etc. Completely bricked.

Luckily this all happened in my driveway. Like everyone else here, or so it seems, we bought this car because we have kids and a newborn baby to haul around town and needed the 3rd row.

Also like others have experienced, we had issues with the Mazda towing service not sending out the right tow vehicle the first time and not being able to put the transmission in neutral when everything is dead.

The dealership ran their diagnostics and claimed the issue was caused by a faulty 12v battery, which they replaced. That was about 700 miles ago and it has been running fine since then, but just yesterday I had a "Low battery mode - Run engine to charge 12v battery" message (or something along those lines, I didn't get a photo in time). That warning combined with the previous issue has me pretty paranoid today.

I spoke with the dealership and they are trying to tell me that this is a normal warning to see occasionally in this vehicle, but their explaination has not been consistent. They originally told me that there is no alternator and that the 12v battery is charged off the high-voltage system, but now that I am getting the low battery warning, they are telling me that I need to be running the gas motor more often to make sure the 12v stays charged.

At this point I don't believe anything coming out of Mazda or the dealership about this issue and am just waiting for it to happen again. I personally think the issue IS related to the 12v battery, and a bunch of the modules in this vehicle do weird things when the 12v battery it totally flat. I just think there is a different underlying cause that is either draining the 12v batteries or just not recharging it adequately.
 
Low 12v battery warning is caused by accumulating more than 30 minutes of battery drain by open doors, liftgate, dome lights or running in accessory mode playing radio or fooling with menus, etc. during car being parked. It doesn't necessarily mean there has actually been much voltage drop off of battery. (1st time for me when spending time with menus in accessory mode battery was 12.3v vs approx 12.6v normal). I always put car in sleep mode (walk away door lock) to prevent any other chance of parasitic drain. Electric motor charges 12v battery, so I would think even running in EV mode would do it.
 
Low 12v battery warning is caused by accumulating more than 30 minutes of battery drain by open doors, liftgate, dome lights or running in accessory mode playing radio or fooling with menus, etc. during car being parked. It doesn't necessarily mean there has actually been much voltage drop off of battery. (1st time for me when spending time with menus in accessory mode battery was 12.3v vs approx 12.6v normal). I always put car in sleep mode (walk away door lock) to prevent any other chance of parasitic drain. Electric motor charges 12v battery, so I would think even running in EV mode would do it.
When I got the low 12v warning, I had been parked for less than 10 minutes after driving in EV mode for ~15 minutes. High-volt battery was still at ~80% charge at the time. It just doesn't seem right to me. It's a hybrid system- if it needs to run the engine to charge the battery, why is it warning ME rather than just firing up the engine when needed?
 
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