U01A1
Lost Communication With Hybrid/EV Battery Interface Control Module B
U01A1 is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module B. Common causes: open or short circuit in wiring harness, hybrid battery control module malfunction. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Reduced engine power
- Problems charging the hybrid battery
- Inability to switch between driving modes
Causes
- Open or short circuit in wiring harness
- Hybrid battery control module malfunction
- Main control unit malfunction
- Problems with power supply or module ground
- Corrosion of contacts or connectors
How to Fix
- Check the integrity of the wiring harness between the modules
- Check the power and ground of the battery control module
- Inspect connectors for corrosion or damage
- Scan the battery management module for additional errors
- Repair only from an authorized dealer
Related codes
Error U01A1 by Vehicle Brand
FAQ
What does the U01A1 code mean?
U01A1 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module B
What causes a U01A1 error code?
The most common causes of U01A1 include: Open or short circuit in wiring harness; Hybrid battery control module malfunction; Main control unit malfunction; Problems with power supply or module ground.
How do I fix a U01A1 diagnostic trouble code?
To fix U01A1: Check the integrity of the wiring harness between the modules. Check the power and ground of the battery control module. Inspect connectors for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U01A1?
Do not drive — repair immediately
How much does it cost to fix U01A1?
The estimated repair cost for U01A1 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
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