U04AC

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

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$167–556 (est.)

Symptoms

Reduced engine power
Warning messages on the dashboard
Battery charging problems
The vehicle goes into emergency mode
Increased fuel consumption (in hybrid models)

Causes

Battery management module malfunction
Damage to the wiring harness between modules
Poor contact in connectors
Software problems
Corrosion or oxidation of contacts

How to Fix

Check connections and integrity of wiring harness
Scan the battery module for errors
Update module software
Check and replace if necessary the battery control module
Repair only from an authorized dealer

Related codes

U04AB U04AD U04AE