P0B29
Hybrid/EV Battery B Voltage Low
P0B29 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery B Voltage Low. Common causes: degradation of high-voltage battery cells, malfunction of the element balancing system. Estimated repair cost: $278–1667.
Symptoms
- Reduced motor power
- Reduced electric range
- Warning messages on the dashboard
- Problems with charging a high-voltage battery
- Switching to petrol engine more often than usual
Causes
- Degradation of high-voltage battery cells
- Malfunction of the element balancing system
- Problems with the Battery Management System (BMS)
- Damage to wiring harnesses or connectors
- Short circuit in battery cells
How to Fix
- Diagnosis of battery cell condition
- Checking the operation of the balancing system
- Battery Management System (BMS) Testing
- Inspection of high voltage system circuits and connectors
- Replacing faulty battery cells or the entire module
- Repair only from an authorized dealer
Related codes
Error P0B29 by Vehicle Brand
FAQ
What does the P0B29 code mean?
P0B29 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery B Voltage Low
What causes a P0B29 error code?
The most common causes of P0B29 include: Degradation of high-voltage battery cells; Malfunction of the element balancing system; Problems with the Battery Management System (BMS); Damage to wiring harnesses or connectors.
How do I fix a P0B29 diagnostic trouble code?
To fix P0B29: Diagnosis of battery cell condition. Checking the operation of the balancing system. Battery Management System (BMS) Testing. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B29?
Do not drive — repair immediately
How much does it cost to fix P0B29?
The estimated repair cost for P0B29 is $278–1667. Actual cost depends on your vehicle, location, and labor rates.
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