POB45 - Hybrid Battery Voltage Sense "C" Circuit Error? (2017 Optima PHEV)

Got the vehicle back from the dealer (18 days later....) They had problems replicating the issue and called us back a few times so I could tell the "hybrid guy" that the check engine light pops up when the EV range is exhausted and the car is put into "CHARGE" mode.

Their final statement was: "Found Hybrid battery to be too low to charge itself in hybrid mode
(12%). Plugged in vehicle and allowed to charge hybrid battery fully. Cleared codes and test drove vehicle. Vehicle is operating as designed. No further service is recommended at this time."

(They also kept asking if we ever plugged it in to charge and let it "reset".....as if we didn't do 90% of the miles on pure electric, and only hit this check engine light when going farther than the battery only range....)

How they explained it to me was if the battery gets to low, the BMS won't let the engine charge it back up (and throws the DTC P0845 trouble code) and then you have to plug the vehicle in to re-charge the battery.

This seems suspect, as the whole point of a hybrid is that the ICE maintains the hybrid battery so it doesn't get too low, but, the error code had cleared itself both times it occurred, so it may not be a big deal....but it's worrying for the vehicle to just throw random check engine lights related to the battery / BMS, and after the electric water pump failure we were on edge when a new check engine light popped right up on the drive home.

Yep...and last night it popped up another one as my wife drove home from work, this time in full EV mode with 70% battery charge. Back to the dealer tomorrow.....

General Update: Dealer didn't want the car over Thanksgiving, and seeing as how it was still driving, told us to bring it back after Thanksgivng. Over the break a new DTC showed up:
"
P0C73 - Powertrain
Motor Electronics Coolant Pump "A" Control Performance. ... The power management control module (HV CPU) performs the role of electronically controlling and regulating the water pump. The code P0C73 is set whenever the HV CPU notifies a failure in the water pump.
"
We also developed an issue where charging from an EVSE (J1772) would be interrupted/stop after 10-30 minutes, and I'd have to re-start it using the Kia access app (or hit the start/stop button inside the car), especially after the vehicle had been driven 20+ miles and the battery was low. And then of course the Kia Access app shows new safety recall:
SC218
-Connecting Rod Bearing can become damaged for different reasons.
-abnormal knocking noise from the engine can occur. (or oil pressure light)
-possible fire if connecting rod punctures the engine block, allowing
engine oil to leak onto the hot exhaust.

So, it's back at the dealership, where they are doing the recall work and have opened a trouble ticket with Nissan USA for help diagnosing the DTCs and other issues.

So, the dealer didn't fix the issue, sent the car home (without providing proof they even did the SC211 recall work), said they would call me back the next week, and never did. Ileft a message asking for a callback, nothing. I sent a message to Kia America via the website and had zero response after 11 days.

Symptoms continue:
-Check engine light on continuously
-Unable to charge for more than 10 minutes at a time. (Start charging, charging is cut off/fails within 1-10 minutes.
-"Check Hybrid system. Turn off engine" Dash messages w/ HEV ! triangle and check engine light. (Also the red battery icon sometimes.)

Then we got stranded at a park. Car reports battery charge at zero percent (was around 45% when parked) and gives a
"Stop vehicle to charge battery" (square box around a P) error message. The green car icon with the double headed arrow under it is flashing, car won't move.


So, I called for a tow (3 hour wait projected by AAA), called the dealership (who said our service advisor was unavailable, but she could email him for a callback), called Kia America and requested a callback. After about 30 minutes (and 10 tries restarting the car) the battery reported it was at 47% and would let me drive (So I drove it directly to the dealer, where surprise, our service advisor was at his desk.). About this time I got a callback from Kia Corporate, and after they put me on hold to speak with the service manager at the dealership, informed me that the dealership was unable to diagnose the issue because both of their EVSE (chargers) were out of service and they expected it to be 2 weeks before they were back in service.

(This was confirmed to me by the dealer service manager in person, but was the first I had heard of this from them.)

It is clear to me that this dealer does not want to work on the PHEV, so I drove it across town to a different dealer. I'm hoping for better service from them. I am also dissapointed in Kia America, as they never responded to my initial complaint submitted via the web message system, and were not helpful in dealing with the dealer. At this point we are venturing into breach of warranty terrotiroy, as it was at the dealer for the same issue four different times.

My "percent uptime" for this vehicle is 80% (in the shop 20% of the days I've owned it), which should explain my frustration. At this point my wife has also lost faith in the car after it has stranded us three times (brake issue, electric water pump failure, battery at zero issue....). [Althugh the 3rd stranding halfway resolved itself over time...]