P0B71

Hybrid/EV Battery Voltage Sense K Circuit Intermittent/Erratic

Severity

🔴 High

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–133 (est.)

Symptoms

Unstable operation of the hybrid system
Reducing electric range
Check Engine Light Illuminates
The car goes into emergency mode
Reduced engine power

Causes

Poor contact in voltage control circuit connectors
Broken or damaged wiring
Battery voltage sensor fault
Corrosion of contacts in the circuit
Problems with the Battery Monitoring Module (BMS)

How to Fix

Voltage Control Circuit Diagnostics
Checking the condition of connectors and contacts
Testing battery voltage sensors
Checking wiring integrity
BMS module software update

Related codes

P0B70 P0B72 P0AFA