U04B1

Invalid Data Received From Battery Monitor Module

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$28–94 (est.)

Symptoms

Error message on the dashboard
Disabling the start-stop system
Incorrect battery voltage readings
Battery charging problems
Reduced efficiency of the power system

Causes

Battery monitoring module malfunction
Broken or damaged wires in the communication circuit
Poor contact in connectors
Software error in the control module
Problems with the main on-board computer

How to Fix

Check the integrity of the communication circuit between the module and the on-board computer
Inspect and clean the contacts in the module connectors
Check the supply voltage and ground of the control module
Scan the module for additional errors
If necessary, replace the battery monitoring module

Related codes

U04B0 U04B2 U0121