[ibsfusion]

Was there any codes that the car was showing to determine that it was hybrid powertrain control module 2 ?

Thank you

 

[pawlow]

Thank you very much! From what I understand a HPCM2 replacement will require dealer programming or some kind of initialization. Is this correct?

Hi, I have read this everywhere , I am going to look around for other tech.s , remember the modules are probably proprietary. I was just quoted a price of $460.00 to replace existing unit and reprogram from a GM dealer.

 

[brianbri6]

Digging up an old post because of some misinformation. The onboard charger is directly connected to the hybrid2 module via the high voltage management bus on the auxiliary OBD2 port on the passenger side. It's not on the single wire bus at all. None of the high voltage charging stuff is on swcan. Everything for charging is on the high voltage management bus. Hopes this straightens this out.

HPCM2 is essentially the most important module in the Volt's management system as (as you've listed) it integrates with so many systems and activities. It is located under the right front passenger seat and If you move the seat all the way back and flip up the small carpet cutout you can easily access it.

FYI the HPCM2 does not directly connect to the on-board charging module as you (or the LEAR document) suggest. That module shown is actually something only LEAR utilizes for bench calibration. It is not HPCM2 or even one of the modules in the Volt.
The HPCM2 communicates with the OBCM (and other modules) via the GMLAN network (SWCAN) used in the Volt
HTH
WOT