P0B77

Hybrid/EV Battery Voltage Sense M Circuit

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Reduced vehicle power
Reducing electric range
Check Engine Light Illuminates
Hybrid system warning
Incorrect battery level display

Causes

Open or short circuit in the voltage sensor circuit
Battery module voltage sensor malfunction
Poor contact in wiring connectors
Wiring harness damage
Internal battery module failure

How to Fix

Check the integrity of the wiring and connectors in the sensor circuit
Test module M voltage sensor
Check the insulation resistance of high-voltage circuits
If necessary, replace the voltage sensor or wiring
Perform Battery Management System (BMS) calibration

Related codes

P0B76 P0B78 P0AFA