U01AC
Lost Communication With Hybrid/EV Battery Interface Control Module M
U01AC is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module M. Common causes: broken or damaged wires in the communication circuit, oxidation or damage to connectors. Estimated repair cost: $167–889.
Symptoms
- Check Engine Light Is On
- The car goes into emergency mode
- Reduced power or inability to start
- Errors in the hybrid/electric powertrain system
- Lack of battery status information on the dashboard
Causes
- Broken or damaged wires in the communication circuit
- Oxidation or damage to connectors
- Battery management module malfunction
- Module power problems
- Software failure in the control module
How to Fix
- Check the integrity of the wiring harness and connectors
- Check fuses and relays associated with the module
- Diagnose the battery management module for errors
- If necessary, reflash or replace the module
- Repair only from an authorized dealer
Related codes
Error U01AC by Vehicle Brand
FAQ
What does the U01AC code mean?
U01AC is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module M
What causes a U01AC error code?
The most common causes of U01AC include: Broken or damaged wires in the communication circuit; Oxidation or damage to connectors; Battery management module malfunction; Module power problems.
How do I fix a U01AC diagnostic trouble code?
To fix U01AC: Check the integrity of the wiring harness and connectors. Check fuses and relays associated with the module. Diagnose the battery management module for errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U01AC?
Do not drive — repair immediately
How much does it cost to fix U01AC?
The estimated repair cost for U01AC is $167–889. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat