U01AF
Lost Communication With Hybrid/EV Battery Interface Control Module P
U01AF is an OBD-II diagnostic trouble code meaning: Lost Communication With Hybrid/EV Battery Interface Control Module P. Common causes: open or short circuit in the can bus, problems with power supply to the battery management module. Estimated repair cost: $167–556.
Symptoms
- Check Engine light comes on
- The car goes into emergency mode
- Reduced engine power
- Battery charging problems
- Inability to switch between driving modes
Causes
- Open or short circuit in the CAN bus
- Problems with power supply to the battery management module
- Malfunction of the control module itself
- Oxidation of contacts in connectors
- Problems with the module software
How to Fix
- Check the integrity of the CAN bus and wiring
- Check the power and ground of the control module
- Inspect and clean connector contacts
- Diagnose the battery control module
- If necessary, replace the control module
- Repair only from an authorized dealer
Related codes
Error U01AF by Vehicle Brand
FAQ
What does the U01AF code mean?
U01AF is an OBD-II diagnostic trouble code that indicates: Lost Communication With Hybrid/EV Battery Interface Control Module P
What causes a U01AF error code?
The most common causes of U01AF include: Open or short circuit in the CAN bus; Problems with power supply to the battery management module; Malfunction of the control module itself; Oxidation of contacts in connectors.
How do I fix a U01AF diagnostic trouble code?
To fix U01AF: Check the integrity of the CAN bus and wiring. Check the power and ground of the control module. Inspect and clean connector contacts. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U01AF?
Do not drive — repair immediately
How much does it cost to fix U01AF?
The estimated repair cost for U01AF is $167–556. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat