This bulletin applies to 2017-2022 Chevy Bolt EV vehicles. The MIL may be on and the driver information center may display “Propulsion Power is Reduced.” Also, the battery will not charge above 30% state of charge (SOC). DTC P0BBD may be set.
There are some driving scenarios which may induce P0BBD without a true battery cell concern. Known cases occur at very low vehicle speeds and perhaps by applying the brake and accelerator at the same time. Other cases have been found to set during DC fast charging on certain models of chargers. Product Engineering has developed a programming solution for the customer driving and charging scenarios.
Note that not all instances of P0BBD will be induced by the customer or charger...some may require replacement of the battery pack.
Use GDS2 to observe the following data parameter:
- Hybrid/electric vehicle battery pack voltage variation exceeded limit – battery cell.
- This parameter is available in GDS2 by navigating to Module Diagnosis - > K114B Hybrid/EV Powertrain Control Module 2 - > Data Display Folder - > Data Display Icon - > Voltage data.
If the parameter Hybrid/Electric Vehicle battery Pack Voltage Variation Exceeded Limit – battery reads cell number 20, 40, 67 or 87, then it is suspected that the customer drives in a way that may set P0BBD or has set during DC fast charging without an actual battery cell problem. The K114B Hybrid/EV PCM 2 will need to be reprogrammed to solve this condition.
Recent revisions to the HPCM2 software to include the DC fast charging solution have been released.
If the value in GDS2 is any other cell number other than 20, 40, 67 or 87, proceed with a pack replacement.
