U0110: Lost Communication With Drive Motor Control Module "A"
Other control units no longer receive messages from the Drive Motor Module.
High risk
Have it checked soon. The car may refuse to drive or limit power.
Short answer · Can I keep driving with U0110?
Usually yes, with care. The car may refuse to drive or limit power. Have the network and the module checked soon.
What does U0110 mean?
Code U0110 means a control unit expected regular messages from the Drive Motor Control Module "A" on the vehicle network and they stopped arriving. A power or ground fault at that module, a damaged network wire or corroded connector, low battery voltage or a failed module are typical causes.
What the car does when the code is set
The car may refuse to go into ready mode, limit power or show several warning lights.
How the system works
In hybrid and electric cars, separate control units manage the drive motor, the high-voltage battery and the overall drive system. They exchange messages all the time; if one goes silent, the others store a lost communication code.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Low 12-volt battery voltageHybrid and electric cars still need a healthy 12-volt battery to wake their control units.
- Power or ground fault at the moduleA blown fuse or loose ground stops the module from answering.
- Network wiring or connector faultDamaged or corroded wires break the link to the module.
- Coolant or water entryMoisture in high-voltage system electronics can cause faults.
- Failed modulePossible, but check the basics first.
How it is diagnosed
- Check the 12-volt batteryMeasure and charge it. Many hybrid and EV faults start with a weak 12-volt battery.
- Check fuses and groundsUse the fuse plan for the hybrid or EV control units.
- Scan all modulesRead codes from every control unit to see which one is missing.
- Leave high-voltage work to specialistsTesting beyond the 12-volt side needs training and insulated tools.Never open orange high-voltage cables or components yourself.
Questions about U0110
Can a weak battery cause U0110?
Yes. Low voltage during starting can make modules drop off the network for a moment and store this code. Check the battery before replacing any module.
Is a hybrid network code dangerous?
The car may refuse to drive or limit power. The high-voltage system is designed to shut down safely, but only trained staff should work on it.