U01B0

Lost Communication With Battery Monitor Module

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Incorrect display of battery charge level
The car goes into emergency mode
Problems starting the engine
Reduced performance of the hybrid system

Causes

Broken or damaged wires in the communication circuit
Malfunction of the battery monitoring module
Module power problems
Short circuit in the CAN bus circuit
Software error in the ECU

How to Fix

Check the integrity of the wiring harness to the module
Check fuses associated with the module
Diagnose the battery monitoring module
Check CAN bus connections
Update ECU firmware if necessary

Related codes

U01A0 U01B1 U0121