U1806
Battery Energy Control Module High Voltage Energy Management CAN Bus Off
U1806 is an OBD-II diagnostic trouble code meaning: Battery Energy Control Module High Voltage Energy Management CAN Bus Off. Common causes: open or short circuit in the can bus, battery management module malfunction. Estimated repair cost: $167–556.
Symptoms
- Check Engine light comes on
- Reduced vehicle power
- Switching to emergency mode
- Problems with charging a high-voltage battery
- Errors in other CAN bus-related systems
Causes
- Open or short circuit in the CAN bus
- Battery management module malfunction
- Module power problems
- Corroded or damaged connectors
- Software error in the module
How to Fix
- Check the integrity of the CAN bus and connectors
- Check the power supply to the control module
- Scan other modules for CAN bus errors
- Update module software
- If necessary, replace the battery management module
- Repair only from an authorized dealer
Related codes
FAQ
What does the U1806 code mean?
U1806 is an OBD-II diagnostic trouble code that indicates: Battery Energy Control Module High Voltage Energy Management CAN Bus Off
What causes a U1806 error code?
The most common causes of U1806 include: Open or short circuit in the CAN bus; Battery management module malfunction; Module power problems; Corroded or damaged connectors.
How do I fix a U1806 diagnostic trouble code?
To fix U1806: Check the integrity of the CAN bus and connectors. Check the power supply to the control module. Scan other modules for CAN bus errors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1806?
Do not drive — repair immediately
How much does it cost to fix U1806?
The estimated repair cost for U1806 is $167–556. Actual cost depends on your vehicle, location, and labor rates.
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