U1861
Battery Charger Control Module Lost Communication With Engine Control Module
U1861 is an OBD-II diagnostic trouble code meaning: Battery Charger Control Module Lost Communication With Engine Control Module. Common causes: broken or damaged can bus wires, disconnected or oxidized connector contacts. Estimated repair cost: $17–89.
Symptoms
- Check Engine light is on
- Incorrect battery charge
- Hybrid system power reduction (if equipped)
- Switching to emergency mode
- Errors in other on-board computer systems
Causes
- Broken or damaged CAN bus wires
- Disconnected or oxidized connector contacts
- Charging control module malfunction
- Problems with on-board voltage
- Software failure in one of the modules
How to Fix
- Check the integrity of the CAN bus wiring
- Inspect and clean the connector contacts
- Check the voltage in the on-board network
- Read error codes in related systems
- Diagnose the charging control module
Related codes
FAQ
What does the U1861 code mean?
U1861 is an OBD-II diagnostic trouble code that indicates: Battery Charger Control Module Lost Communication With Engine Control Module
What causes a U1861 error code?
The most common causes of U1861 include: Broken or damaged CAN bus wires; Disconnected or oxidized connector contacts; Charging control module malfunction; Problems with on-board voltage.
How do I fix a U1861 diagnostic trouble code?
To fix U1861: Check the integrity of the CAN bus wiring. Inspect and clean the connector contacts. Check the voltage in the on-board network. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1861?
Yes, but get it checked soon
How much does it cost to fix U1861?
The estimated repair cost for U1861 is $17–89. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat