CAN network

U0110 — Lost Communication with Drive Motor Control Module

Severity: high Do not drive

What U0110 means

U0110 means another control unit stopped receiving messages from the drive motor control module (the motor controller/inverter) over the CAN bus. Modules normally exchange data constantly so the drive system can be coordinated. If those messages drop out because of wiring, power or the module itself, propulsion can't be controlled properly.

Symptoms

  • Check Engine light on
  • Hybrid or EV system warning lights
  • Limp mode or no-start condition
  • Loss of power or propulsion
  • Ready mode unavailable
  • Other U-codes stored at the same time
  • Functions of the affected module not working

Possible causes

  1. Damaged or corroded CAN bus wiring or connectors
  2. Open or short in the CAN lines, or in the module's power or ground
  3. Failed drive motor control module or inverter
  4. Software or firmware glitch in the module
  5. Low or unstable 12 V system voltage
  6. High-voltage system fault
  7. High-voltage service disconnect left open

How to diagnose

  1. Test the 12 V battery voltage and check the terminals, since a voltage drop alone can cause lost communication.
  2. Scan all modules and note which ones aren't responding and what they share.
  3. Review freeze frame data to see whether the fault is constant or intermittent.
  4. Inspect the harness and connectors at the drive module and along the CAN bus for chafing, moisture, corrosion or past repairs.
  5. Check the module's power and ground supplies against the wiring diagram.
  6. Measure resistance between CAN-H and CAN-L at the diagnostic connector (typically about 60 ohms with the car off) and check line voltages.
  7. Confirm the high-voltage service disconnect is installed, and follow the manufacturer's safety procedure for any high-voltage work.
  8. Check for available software updates for the module.

Common fixes

  • Repair or replace damaged CAN wiring and connectors
  • Clean and secure module connectors and restore power and ground
  • Update or reflash the module software
  • Replace the drive motor control module or inverter once confirmed faulty
  • Charge or replace the 12 V battery if voltage is low

Questions and answers

What does U0110 mean?

It means communication was lost over the CAN bus with the drive motor control module. Wiring, module power or the module itself are the usual culprits.

Can I drive with a U0110 code?

It's best not to. The vehicle may lose propulsion or not start, and high-voltage faults add risk. Get it diagnosed first.

Can U0110 go away after replacing the 12 V battery?

Sometimes, if low voltage caused it. If the code returns, look for a CAN wiring problem or a faulty module.

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.