P0B31
Hybrid/EV Battery D Voltage Low
P0B31 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery D Voltage Low. Common causes: battery module d fault, problems with module connections. Estimated repair cost: $167–556.
Symptoms
- Reduced vehicle power
- Reducing electric range
- Check Engine Light Illuminated
- Battery warning on instrument panel
- The car may go into emergency mode
Causes
- Battery module D fault
- Problems with module connections
- Battery management system (BMS) malfunction
- Problems with the cell balancing system
- Excessive battery wear
How to Fix
- Diagnosis of battery module D status
- Checking module connections and wiring
- Testing the Battery Management System
- Replacing a faulty battery module if necessary
- Repair only from an authorized dealer
Related codes
Error P0B31 by Vehicle Brand
FAQ
What does the P0B31 code mean?
P0B31 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery D Voltage Low
What causes a P0B31 error code?
The most common causes of P0B31 include: Battery module D fault; Problems with module connections; Battery management system (BMS) malfunction; Problems with the cell balancing system.
How do I fix a P0B31 diagnostic trouble code?
To fix P0B31: Diagnosis of battery module D status. Checking module connections and wiring. Testing the Battery Management System. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B31?
Do not drive — repair immediately
How much does it cost to fix P0B31?
The estimated repair cost for P0B31 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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