U1866
Battery Energy Control Module Lost Communication With Body Control Module
U1866 is an OBD-II diagnostic trouble code meaning: Battery Energy Control Module Lost Communication With Body Control Module. Common causes: open or short circuit in the communication circuit, poor contact in module connectors. Estimated repair cost: $6–167.
Symptoms
- Flashing or failure of lighting equipment
- Window failure
- Errors in the operation of the dashboard
- Problems starting the car
- Incorrect battery level readings
Causes
- Open or short circuit in the communication circuit
- Poor contact in module connectors
- Battery management module malfunction
- Body control module problems
- Wiring harness damage
How to Fix
- Check the integrity of the wiring between the modules
- Inspect and clean the contacts in the connectors
- Check power and ground of modules
- Read fault codes of all modules
- Replace damaged components if necessary
Related codes
FAQ
What does the U1866 code mean?
U1866 is an OBD-II diagnostic trouble code that indicates: Battery Energy Control Module Lost Communication With Body Control Module
What causes a U1866 error code?
The most common causes of U1866 include: Open or short circuit in the communication circuit; Poor contact in module connectors; Battery management module malfunction; Body control module problems.
How do I fix a U1866 diagnostic trouble code?
To fix U1866: Check the integrity of the wiring between the modules. Inspect and clean the contacts in the connectors. Check power and ground of modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1866?
Yes, but get it checked soon
How much does it cost to fix U1866?
The estimated repair cost for U1866 is $6–167. Actual cost depends on your vehicle, location, and labor rates.
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