P0B21

Hybrid/EV Battery Pack Voltage Sense D Circuit High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

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

P0B22 P0B20 P0A80