P0B99

Hybrid/EV Battery Voltage Sense S Circuit Intermittent/Erratic

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$33–167 (est.)

Symptoms

Check Engine light comes on
Reduced vehicle power
Switching to emergency mode
Unstable operation of the hybrid system
Battery charging problems

Causes

Damaged or corroded sensor connectors
Open or short circuit in wiring
Battery voltage sensor fault
Problems with the hybrid system control module
Poor circuit grounding

How to Fix

Check the integrity and cleanliness of the sensor connectors
Test wiring for opens and short circuits
Check the resistance and signal of the voltage sensor
Inspect the hybrid system control module for damage.
Repair only from an authorized dealer

Related codes

P0B97 P0B98 P0B9A