OBD Guide

U01BB

Lost Communication With Battery Charger Control Module B

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Check Engine light comes on
  • Reduced battery charging efficiency
  • Problems starting the engine
  • Power reduction in hybrid systems
  • Errors in the charging system on the dashboard

Causes

  • Broken or damaged wires in the communication circuit
  • Battery charging control module B faulty
  • Connector problems or contact corrosion
  • Failures in ECU software
  • Module power problems

How to Fix

  1. Check the integrity of the wiring harness and connectors
  2. Check the power and ground of the control module
  3. Scan the module for additional errors
  4. Replace the charging control module if necessary
  5. Update ECU software if necessary

Related codes

Error U01BB by Vehicle Brand