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Discussion Starter · #1 ·
Our 2017 Optima PHEV just turned on the HEV warning light (solid yellow triangle with
HEV and exclamation point). The Kia app says:
Powertrain
POB45 - Hybrid Battery Voltage Sense "C" Circuit

"Possible condition(s) with your Battery Management System
has been detected. KIA recommends a full system check when convenient."


Just wondering if anybody had ran into this error message before and what the resolution was? We've got an appointment to drop it off tomorrow for a check, but I wanted to know how hard I should push for a loaner vehicle.... (the last HEV warning light turned out to be only a burnt out fuse...but that was a different error code/message...)

Thanks,
Jay
 

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Discussion Starter · #3 ·
Drove it to the dealer the next day, the HEV warning light had gone out, but the check engine light was still on. The "Hybrid" guy wasn't in that day, so they asked me to bring it back the next day. The next day the check engine light had cleared itself, but they pulled the code from the history and cleared the codes, and told me to bring it back if they re-appeared.
Day after that the car threw a different code and went into "blinking green car/arrow" emergency driving mode. The code now was: "U1116 Lost communication with EWP". This is a code we had seen before (5 months ago), and the dealer said a fuse had blown, they replaced the fuse and cleared the code, but now it's back. Not sure if it's related to the previous code that cleared itself or not (electric water pump and BMS are somewhat different systems), but the car is at the dealer now.
 

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Discussion Starter · #5 ·
Update: Dealer called, the electric water pump was replaced, we picked up the car (21 days later...). BUT, on the way home, my wife was using the "Charge" mode to charge the battery up a little (came back from the dealer with no charge) and the check engine light popped up, with the same POB45 Hybrid Battery Voltage Sense "C" Circuit error message as before. Guess we know what we will be doing tomorrow morning....
 

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Discussion Starter · #7 ·
That sucks that you have to take it back to the dealer immediately after picking it up.
Seems that some dealers just can't handle working on hybrids.
In all fairness to the dealer, it appears to be two separate (and possibly unrelated) problems that just happen to be happening at the same time. The water pump they replaced had surfaced as a blown fuse 5 months ago, and the BMS error appears to be intermitant and self clearing, but we do want to make sure it's addressed before the warranty expires....
 

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Discussion Starter · #8 · (Edited)
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.
 

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I call BS on their explanation.
If the system was working as designed why would it intentionally throw a CEL?
How is a vehicle that is operating as designed throw an error light?
I would have asked them to name any other manufacturer that has their vehicles programmed to throw a CEL when the vehicle is operating as designed.
 

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Discussion Starter · #10 ·
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.....
Speedometer Trip computer Odometer Vehicle Tachometer
 

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Discussion Starter · #11 ·
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.
 
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