I have ~3.2v coming through my sensor harness, even after removing the pigtail to inspect the splice. If this is the only problem, I'm thinking I will use a 16k resistor to bring the current down to the acceptable volage range for the HPCM2 to read. This calculation is based on the 24.7k resistor values used by the defeat plugs to correct the sensor issue when running at 5v.Edit: Nvm WOT, I found an official document by accident, stating that the 5 V are indeed correct for the HPCM2 and my 3.563 V look like serious trouble
So you went from 400k to 3000k resistance after what sounds like you only replaced the tank (resevoir?) coolant?Ok...I did another battery coolant sample test with the jar and it came out 2ma which is a 6 fold drop from the original reading. I don't know how the coolant loop works as to whether coolant replaced in the tank actually gets mixed in quickly with the rest of the coolant in the loop as the pump runs or it mostly sits there and very slowly gets diffused into the rest of the coolant.
I re-flashed the the control module 2 and since the car never had the battery flash recall done I did that also. The car charges again and the isolation reading is at 3000k. I plan on driving the car for a month as-is (if it keeps charging) and checking the coolant again. At that point I may either take it to the dealer and have the loops flushed or buy my own vac-fill setup. Having always done the vast majority of auto service on my autos I would hate to stop now.