U1838
Lost Communication With Battery Charger Control Module On High Voltage Energy Management CAN Bus
U1838 is an OBD-II diagnostic trouble code meaning: Lost Communication With Battery Charger Control Module On High Voltage Energy Management CAN Bus. Common causes: open or short circuit in can circuit, charging control module malfunction. Estimated repair cost: $56–278.
Symptoms
- Check Engine light comes on
- Problems with charging a high-voltage battery
- Reduced vehicle power
- Errors in the operation of the hybrid system
- Inability to charge the battery
Causes
- Open or short circuit in CAN circuit
- Charging control module malfunction
- Module power problems
- Corrosion of connectors
- Software error in the module
How to Fix
- Check the integrity of the CAN bus wiring harness
- Check the power and ground of the charging control module
- Inspect connectors for corrosion
- Scan other modules for errors
- Update module software
- Repair only from an authorized dealer
Related codes
FAQ
What does the U1838 code mean?
U1838 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Battery Charger Control Module On High Voltage Energy Management CAN Bus
What causes a U1838 error code?
The most common causes of U1838 include: Open or short circuit in CAN circuit; Charging control module malfunction; Module power problems; Corrosion of connectors.
How do I fix a U1838 diagnostic trouble code?
To fix U1838: Check the integrity of the CAN bus wiring harness. Check the power and ground of the charging control module. Inspect connectors for corrosion. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U1838?
Yes, but get it checked soon
How much does it cost to fix U1838?
The estimated repair cost for U1838 is $56–278. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat