one or two batter could be bad you will have to see if you have a second code


OR you will need to Test each battery module to find the broken one much better then shipping 40 batteries

as one or two of the modules are hitting the 1.5 volt threshold value

Tell us the Year there is a TSB for the BPCM


There was a Secret Recall


it mentions the battery and reprograming the module as well as other modules

it does not specify if it's the High voltage battery though.. the only way to know is to run the vin at the dealer and see if they were done

 

It's a 2008

 

The GM scan tool can read the Twenty voltmeters inside the pack. Most likely the P0BBD is one of those 40 modules sagging under load for the three seconds it takes for that code to set.

 

May have figured it out. Wish I could get a nice log off of tourqe of this as I seen on another post, but it looks like I have 1 cell block that is drifting periodically. It isnt always different but it comes and goes quite often.

 

That's a **** show. Since you confirmed all module nut torques, I can only conclude they sent you a bad module in block 7

 

So how are the cell blocks laid out, which end starts the pack?

 

Block #1 is the one closest to the fan and intake. The 7th pair of modules from that end is the one giving you problems.

 

If you run a discharge in "N" until you get to a very low SoC, the bad module should stand out with low voltage.

 

In God We Trust... all others show data!

Looks like weak module in Block 7

Keith, can he remove the pair and perform some sort of "light load" test like running an old school headlamp to see which one of the pair is weak?

Just my $0.02 question of the day.

 

A high wattage auto bulb will do. I prefer one of these:


Will hit a module with about 60A. Best to use a separate attached voltmeter for the start/end currents. Record current, hit with tester for 10 seconds, record loaded voltage, terminate load.

A module performing like the one in the graph will stick out like a thumb on fire.

In addition to the utility of this exercise, you now have a 12V load tester, so you'll always know if your 12V is/are good.