U01AA
Lost Communication With Hybrid/EV Battery Interface Control Module K
U01AA is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module K. Common causes: broken or damaged wires in the can bus, battery management module malfunction. Estimated repair cost: $167–556.
Symptoms
- Check Engine light comes on
- Reduced vehicle power
- Battery charging problems
- The car goes into emergency mode
- Inability to start the engine (on all-electric models)
Causes
- Broken or damaged wires in the CAN bus
- Battery management module malfunction
- Module power problems
- Contact corrosion
- Software error in the module
How to Fix
- Check the integrity of the CAN bus and connections
- Check the power and ground of the control module
- Scan the module for additional errors
- If necessary, replace the battery management module
- Update module software (if available)
Related codes
Error U01AA by Vehicle Brand
FAQ
What does the U01AA code mean?
U01AA is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module K
What causes a U01AA error code?
The most common causes of U01AA include: Broken or damaged wires in the CAN bus; Battery management module malfunction; Module power problems; Contact corrosion.
How do I fix a U01AA diagnostic trouble code?
To fix U01AA: Check the integrity of the CAN bus and connections. Check the power and ground of the control module. Scan the module for additional errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U01AA?
Limited driving only, diagnose soon
How much does it cost to fix U01AA?
The estimated repair cost for U01AA is $167–556. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat