Hybrid/EV Battery B Voltage High

Common symptoms

What you'll notice

• Check for any loose or corroded battery connections and clean or tighten as necessary.
• Perform a battery load test to check for any weak cells or a faulty battery.
• Inspect the wiring and connections leading to the hybrid/EV battery pack for any damage or wear.
• Reset the battery management system (BMS) to clear any error codes and recalibrate the battery pack.
• If all else fails, consider replacing the hybrid/EV battery pack with a new or rebuilt unit.

Common causes

Most likely first

1. Low voltage in the Hybrid/EV battery
2. Faulty Hybrid/EV battery
3. Poor battery connection
4. Faulty charging system
5. Faulty control module

How to diagnose & fix

Work through it in order

1. Decreased power and acceleration
2. Malfunctioning electrical components (e.g. lights, radio, power windows)
3. Engine stalling or hesitating
4. Reduced fuel efficiency
5. Difficulty starting the vehicle