P0BBB

Hybrid/EV Battery Voltage Sense Z Circuit High

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Illuminates
Hybrid system power reduction
The car goes into emergency mode
Unstable operation of the hybrid power plant
Reduced efficiency of regenerative braking

Causes

Malfunction of balancing resistor in circuit Z
Damage to wires or connectors in the measurement circuit
Short circuit in voltage measurement circuit
Battery Monitoring Module (BMS) malfunction
Increased real voltage in cell group Z

How to Fix

Check the integrity of wires and connectors in circuit Z
Test group Z balancing resistors
Check the operation of the BMS module
Measure the actual voltage in a group of cells Z
Repair only from an authorized dealer

Related codes

P0BBA P0BBC P0AFA