Thank you so very much, it worked like a champ and I am now logging my battery voltages as well as the charge state. I will see if I can find any anomalies and hopefully fix them.

 

Up to about 50A, you should not have a deviation larger than 0.2V between the highest and lowest block voltage. 0.3V may be workable, but it's indicative of an ailing pack.

Under heavy loads, 80A+, deviations of up to 0.6V seem pretty common, but they are usually transient and will slip back to the 0.2-0.3V range IF your pack is in good shape.

If you see blocks that are outliers on the order of 1V, you have a failed cell in that block.

If you see a block swinging from being the high voltage one during charge to the low voltage one during discharge - failed cell.

Good luck.

 

Thanks for providing the PIDs!! I've been having issues with stalling at stop signs and at times the RPMs just reving up when I come out of AutoStop - usually happens when I am within the first 5-10 minutes of first driving (hot inside). I had vacuumed my HV battery vents (a few months) ago, but didn't realize the spot Hillbilly (and others) mention is located on the actual battery. I pulled the cover, last night, and it looked like a dryer vent after a load of towels.

Now, that I have the PIDs, I have been monitoring my performance today. It was about 90*, but I never had an issue. So, I have my finger's crossed it was due to a lack of air getting into the battery.

However, I noticed my SoC was about 50 and throughout my stop and go driving it varied from 49 to 65, but the last few miles to my house it got up to 70. My banks all stayed within .3 of each other and ranged from about 17.5 down to the high 14s, but stayed in the 17 range the majority of the time..

My question, does the SoC ever get up to 100%? My Tahoe was still going into AutoStop no matter the SoC.

 

The SoC should never be 100% unless there's a malfunction.

Given that this is a Toyota built battery, it's likely the SoC range is 40-80% with a "resting" SoC of 60%.