U04AC
Invalid Data Received From Hybrid/EV Battery Interface Control Module L
U04AC is an OBD-II diagnostic trouble code meaning: Invalid Data Received From Hybrid/EV Battery Interface Control Module L. Common causes: battery management module malfunction, damage to the wiring harness between modules. Estimated repair cost: $167–556.
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
Error U04AC by Vehicle Brand
FAQ
What does the U04AC code mean?
U04AC is an OBD-II diagnostic trouble code that indicates: Invalid Data Received From Hybrid/EV Battery Interface Control Module L
What causes a U04AC error code?
The most common causes of U04AC include: Battery management module malfunction; Damage to the wiring harness between modules; Poor contact in connectors; Software problems.
How do I fix a U04AC diagnostic trouble code?
To fix U04AC: Check connections and integrity of wiring harness. Scan the battery module for errors. Update module software. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U04AC?
Do not drive — repair immediately
How much does it cost to fix U04AC?
The estimated repair cost for U04AC is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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