P0B51

Hybrid/EV Battery Voltage Sense E Circuit Low

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–167 (est.)

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

P0B50 P0B52 P0A80