I have a 2018 FFE that recently threw a bunch of codes and has had a significant drop in battery capacity. I'm hoping to get some help with diagnosis and opinions if fixable of if car is a lost cause. I love the car and would like to keep it as long as possible.
A couple months ago I noticed the high voltage contactors clicking on and off, repeatedly and constantly. I unplugged the charger, trickle charged the 12V battery and the problem seemed to go away. I didn't think much of it at the time, but I later pulled the code U0100: BECM lost communication with ECM/PCM. Seems like the beginning of the end. After this event the guess-o-meter seemed off (low) and I noticed regen often didn't work as usual. At the time battery voltage was: HEV_BAT_VAR_V: 0.04 V, HEV_BAT_MIN_V: 4.05 V
Just last week the wrench light came on with the following codes: P0BBE - Hybrid/EV Battery Pack Voltage Variation, P0C30 - Hybrid/EV Battery Pack State of Charge High, P0A1F - Battery Energy Control Module 'A' Performance. Currently the battery voltages are HEV_BAT_VAR_V: 0.36 V and HEV_BAT_MIN_V: 3.94 V.
I performed a run down test a couple days ago which showed 17.1 kW battery capacity, which is about 40% loss if I calculate correctly. ETE currently shows just over 14 kW battery capacity in Forscan. It seems like every time I drive then charge it gets less and less. Has anybody seen these codes or this much capacity loss in a such a short amount of time? Is there any way to force re-balance the cells? What is control module "A"? Is the battery dead or dying? Should I take it into the Dealer? Any thoughts appreciated. Thanks