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OBD-II · Network and communication (U)

U0111

Lost communication with battery energy control module A

What it means

Another module has stopped receiving messages from the control unit that manages the high-voltage (hybrid/EV) battery.

Symptoms

  • Hybrid/EV system warning
  • Car will not go into READY or drive mode
  • Charging not possible

Likely causes, most likely first

Likely causes, most likely first
No.Cause
01weak or flat 12V battery (very common on hybrids and EVs)
02blown fuse for the battery management module
03loose or corroded connector at the high-voltage battery
04CAN wiring fault
05failed battery management module

What to check, step by step

  1. 01Test and charge the 12V battery first
  2. 02Check the battery management fuse
  3. 03Check whether the battery management module answers a scan tool
  4. 04High-voltage battery connectors and internals must only be checked by a high-voltage qualified technician