Alerts

The computed alpha estimate for a brick is repeatedly below the alert alpha threshold. The threshold comes over the Controller Area Network (CAN) via signal MCU_dSocAlertThreshold.

This alert is primarily informational and is used for logging purposes. No expected impact on vehicle functionality.

High voltage processor (HVP) comms are OK and pack contactors were closed and pack contactors are now open / opening and BMS_packContactorRequest has remained closed.

Inability to charge, drive, or support the low voltage (LV) system

The BMS detects a condition that prevents it from closing pack contactors.

Inability to charge, drive, or support the low voltage (LV) system

The BMS detects a VSH impedance value above the threshold.

Inability to charge, drive, or support the low voltage (LV) system

Upon a periodic wake, after an ECU reset, or every 6 hours, the Battery Management System (BMS) will test all bleed switches by switching them on in turn. If the sensed brick voltage does not significantly change, this alert is set.

The bleed FET will prevent the battery from properly balancing the brick by bleeding the voltage down. There is a decrease in available energy to the vehicle potentially leading to decreased range.

Any BMB device reports an uncorrectable error in the OTP memory.

This alert is primarily informational and is used for logging purposes. BMB device behavior may be impacted.

The BMS runs the BMB pattern diagnostics and detects a deviation from the expected results for any device in the chain.

This alert is primarily informational, and may indicate a potential BMB hardware failure.

The maximum module temperature is greater than the warning threshold.

Vehicle performance is limited.

The battery management system (BMS) has detected a mismatch between the pack voltage and DC Link voltage.

Inability to charge, drive, or support the low voltage (LV) system

Any BMB device in the daisy chain reports any of the monitored fault indicators.

This alert is primarily informational, and may indicate a potential BMB hardware failure that results in unreliable measurement data.

Mute is disabled for any device while balancing, or otherwise enabled for any device.

Bleeding bricks that do not mute during balancing can impact the state of charge (SOC) estimation.

The BMS detects that the HV isolation was below the warning threshold when pack contactors closed.

This alert indicates that HV isolation is low, but above the sufficient level for vehicle operation.

The BMS detects a prolonged communication issue with the BMB daisy chain that is known to cause a loss of BMB sensor data.

The BMS is likely performing BMB sensor data substitution to replace data missing due to the communication issue.

The BMS detects a change in CAC above the limit threshold.

This alert is primarily informational.

The hardline from the CP to the BMS is active.

Vehicle charging is unavailable.

One more BMS alerts that prevents pack contactors from closing is present.

Inability to charge, drive, or support the low voltage (LV) system

One or more battery management system (BMS) alerts that reduce the maximum charge limit are set, and the instantaneous charge level is higher than that limit.

Vehicle will not be able to charge if connected to a power source, as the reduced maximum HV battery charge level is exceeded.

The discharge current is above an acceptable threshold while DC charging is enabled

The vehicle will not charge until the charge cable is removed and the alert is cleared

The BMS detects that the HV pack has been discharged to below the set threshold while charging.

Inability to charge

The HV battery is charging and the BMS detects a condition that prevents it from disabling the charge session.

This alert is primarily informational and used for logging purposes.