U04A1

Invalid Data Received From Hybrid/EV Battery Interface Control Module A

Severity

🔴 High

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Hybrid system power reduction
Incorrect battery level display
The vehicle goes into emergency mode
Errors in the operation of the regenerative braking system

Causes

Battery management module malfunction
Damaged wiring harness or connectors
Problems with the CAN bus (interference, break)
Software error in battery module
Corrosion of contacts in the communication circuit

How to Fix

Carry out diagnostics of the CAN bus for communication errors
Check the integrity of the wiring harness and battery module connectors
Read error codes from the battery module to determine the problem
If necessary, update the module software
Repair only from an authorized dealer

Related codes

U04A0 U04A2 U04A3