P0B51
Hybrid/EV Battery Voltage Sense E Circuit Low
P0B51 is an OBD-II diagnostic trouble code meaning: Hybrid/EV Battery Voltage Sense E Circuit Low. Common causes: malfunction of cell e of the high-voltage battery, problems in the voltage measurement circuit (open, short circuit). Estimated repair cost: $56–167.
Symptoms
- Check Engine light comes on
- Reduced vehicle power
- Reducing electric range
- Incorrect battery level readings
- The car may go into emergency mode
Causes
- Malfunction of cell E of the high-voltage battery
- Problems in the voltage measurement circuit (open, short circuit)
- Poor contact in the measuring circuit connectors
- Battery management module (BMS) malfunction
- Corroded contacts or damaged wiring
How to Fix
- Check the condition of cell E of the high-voltage battery
- Check the integrity of the voltage measurement circuit
- Inspect connectors and contacts for corrosion or damage
- Check Battery Management Module (BMS) operation
- Replace faulty battery or measuring circuit components
Related codes
Error P0B51 by Vehicle Brand
FAQ
What does the P0B51 code mean?
P0B51 is an OBD-II diagnostic trouble code that indicates: Hybrid/EV Battery Voltage Sense E Circuit Low
What causes a P0B51 error code?
The most common causes of P0B51 include: Malfunction of cell E of the high-voltage battery; Problems in the voltage measurement circuit (open, short circuit); Poor contact in the measuring circuit connectors; Battery management module (BMS) malfunction.
How do I fix a P0B51 diagnostic trouble code?
To fix P0B51: Check the condition of cell E of the high-voltage battery. Check the integrity of the voltage measurement circuit. Inspect connectors and contacts for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0B51?
Do not drive — repair immediately
How much does it cost to fix P0B51?
The estimated repair cost for P0B51 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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