P0B21
Hybrid/EV Battery Pack Voltage Sense D Circuit High
P0B21 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Pack Voltage Sense D Circuit High. Common causes: battery voltage sensor fault, damage to the wiring in the measurement circuit. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- Hybrid system power reduction
- Reducing electric range
- The car may go into emergency mode
- Possible problems with battery charging
Causes
- Battery voltage sensor fault
- Damage to the wiring in the measurement circuit
- Corrosion or poor contact in connectors
- Problems with the battery management module
- Malfunction of the highest voltage battery
How to Fix
- Carry out diagnostics of the high-voltage system
- Check the integrity of wiring and contacts
- Test voltage sensors
- If necessary, replace faulty components
- Reset the error and check the system after repair
Related codes
Error P0B21 by Vehicle Brand
FAQ
What does the P0B21 code mean?
P0B21 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Pack Voltage Sense D Circuit High
What causes a P0B21 error code?
The most common causes of P0B21 include: Battery voltage sensor fault; Damage to the wiring in the measurement circuit; Corrosion or poor contact in connectors; Problems with the battery management module.
How do I fix a P0B21 diagnostic trouble code?
To fix P0B21: Carry out diagnostics of the high-voltage system. Check the integrity of wiring and contacts. Test voltage sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B21?
Do not drive — repair immediately
How much does it cost to fix P0B21?
The estimated repair cost for P0B21 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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