P0AF9

Hybrid/EV Battery System Voltage Unstable

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$167–1111 (est.)

Symptoms

Reduced vehicle power
Switching to emergency mode
Warning messages on the dashboard
Reducing electric range
Unstable operation of the power plant

Causes

Degradation of high-voltage battery cells
Problems with balancing battery cells
Battery management system (BMS) malfunction
Damage to high voltage connections
Problems with the battery cooling system

How to Fix

Diagnosis of high-voltage battery condition
Checking and replacing faulty battery cells
Battery Management System (BMS) Testing
Checking the integrity of high voltage connections
Diagnostics of the battery cooling system

Related codes

P0AFA P0AF8 P0A80