P0DB1 — Hybrid/EV battery cell-balancing circuit B — stuck active

P0DB1 concerns hybrid/EV battery cell-balancing circuit B. The monitored circuit or control function is reported as remaining active when that state is not expected. B identifies the balancing circuit named by the manufacturer, not a universal cell number or battery location.

Affected system: Hybrid/EV battery cell balancing

Symptoms

• System warning may illuminate
• Affected feature may be unavailable
• Symptoms depend on the vehicle

Possible causes

• Hybrid powertrain sensor, actuator, power supply, connector, or control issue
• Module power, ground, or connector fault
• Vehicle-specific mechanical or control issue

What to check

• Record all available module faults
• Record hybrid and electric powertrain module faults with a compatible scan tool. Check the specified low-voltage supplies and module data first; follow vehicle-specific high-voltage safety procedures for further diagnosis.
• Compare results with vehicle-specific service information
• Verify the repair
• Record hybrid and electric powertrain module faults with a compatible scan tool. Check the specified low-voltage supplies and module data first; follow vehicle-specific high-voltage safety procedures for further diagnosis.
• Repair the verified cause and rescan all affected modules

Also written as: P0DB1-00, P0DB100, PODB1 (some scan tools add the fault-type byte, e.g. -00).