CAN network

U0113 — Lost Communication with Battery Pack Control Module

Severity: high Drive with care, to a shop

What U0113 means

U0113 means one or more control units stopped receiving messages from the high-voltage battery pack control module over the CAN bus. That module monitors cell voltage, temperature and current and controls the battery contactors. Without its data, the system cannot safely connect the battery to the drive circuit.

Symptoms

  • Hybrid system warning message
  • Ready indicator does not come on
  • Several warning lights on at once
  • Reduced power or no drive power
  • Functions tied to the battery module, such as charging, unavailable

Possible causes

  1. Dead or weak 12V auxiliary battery
  2. Fault in the high-voltage battery or its control module
  3. Service plug removed or not fully seated
  4. Open, shorted or chafed CAN wiring to the battery pack
  5. Corroded connectors or terminals
  6. Missing power or ground at the battery control module
  7. Another faulty module loading down the CAN bus

How to diagnose

  1. Test the 12V battery voltage and terminals; charge or replace it if low, then clear codes
  2. Run a full-module scan to see which modules are not communicating
  3. Confirm the HV service plug is fully installed if it was removed
  4. Measure CAN bus resistance at the diagnostic connector (typically about 60 ohms between CAN H and CAN L) and check line voltages
  5. Inspect the battery module harness and connectors for corrosion, moisture or damaged insulation
  6. Check the module's power and ground against the factory wiring diagram
  7. Disconnect suspect modules one at a time only with a documented procedure
  8. Leave any high-voltage work to a trained technician

Common fixes

  • Charge or replace the 12V battery
  • Repair or replace damaged CAN wiring and connectors
  • Clean terminals and restore power and ground to the module
  • Replace a faulty module that is loading the bus
  • Repair or replace the battery control module or HV battery at a qualified shop

Questions and answers

What does code U0113 mean?

It means communication with the battery pack control module was lost. Other modules are not receiving its data over the CAN bus, so the hybrid system may not start.

Can a weak 12V battery cause U0113?

Yes, it is one of the most common causes. Low voltage makes modules behave erratically and drop off the network, so check the 12V battery first.

Can I remove the service plug and test the HV battery myself?

Not without proper training. High-voltage systems can be lethal, so this work should be done by a qualified technician.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.