BMS_a068 — CAC Imbalance Limp
Full alert identifier: BMS_a068_CAC_Imbalance_Limp
Message shown in the car
High voltage battery requires service Acceleration and charging performance reduced
Alert description
Calculated Amp-hour Capacity (CAC) difference of bricks within a module exceeds acceptable threshold. This results in reduced battery performance and limits maximum range. Vehicle enters Battery Management System (BMS) limp mode.
Potential impact
Maximum charge and discharge current limits and maximum energy available are reduced, causing reduced battery performance and limiting maximum range. BMS limp mode is triggered, with another alert present to indicate this condition.
Set condition
The estimated imbalance between the average CAC and minimum CAC within a single module exceeds the alert set threshold (CAC imbalance is not within acceptable range)
Clear condition
The estimated CAC imbalance is under the alert clear threshold (CAC imbalance is within acceptable range)
Signals to check
Open this alert in Service Mode Plus and review the Payload tab. Use the field names below to identify the values shown by your vehicle.
| Signal | Unit |
|---|---|
Avg Brick Cac
BMS_
|
Ah |
Min Brick Cac
BMS_
|
Ah |
Mod Cac Imbalance Pct
BMS_
|
% |
| Signal | Unit |
|---|---|
Min Brick Cac Id
BMS_
|
— |
Check other alerts
With Service Mode Plus enabled, open Service Alerts → All. Review the other alerts for clues to the cause of BMS_a068.