OBD-II trouble code
U0110: Lost Communication with Drive Motor Control Module
A module on the network can no longer hear from the drive motor control module. Usually a power, ground, or wiring fault — and because this module runs the electric traction motor, a hybrid or EV may lose propulsion, cut power, or refuse to move.
Quick facts
- System
- Network
- Category
- Network Communication
- Severity
- High severity
- Drivable
- No — stop driving until repaired
- Repair cost range
- $150 – $2,500
- DIY difficulty
- Shop recommended
What does U0110 mean?
U0110 is set when another module on the vehicle's communication network — usually a hybrid or vehicle control module — stops receiving messages from the drive motor control module. On hybrid and electric vehicles this module (often the inverter/motor controller) manages the high-voltage traction motor: it converts DC battery power into the AC the motor needs, controls torque and regenerative braking, and reports motor status back over the network. When the network loses contact with it, U0110 records the dropout.
The causes follow the familiar communication-code pattern. The module may have lost low-voltage power or ground through a blown fuse, corroded ground, or failed relay. The communication wiring or connector at the module can be damaged or corroded. The module's internal communication circuitry can fail, or another module on the bus can disrupt communication for everyone. Low 12-volt system voltage can also cause intermittent dropouts. Because this module sits in the high-voltage system, diagnosis must follow the manufacturer's high-voltage safety procedures.
Because propulsion depends on this module, the symptoms are usually severe. The vehicle may enter a reduced-power or fail-safe mode, lose electric drive, refuse to enter Ready mode, or not move at all; warning lights and 'service powertrain' or 'reduced power' messages are common. The check engine light or hybrid/EV warning comes on, often with companion hybrid-system codes. A vehicle that may lose propulsion is both a driveability and a safety concern — and the high-voltage components involved make this a job for a qualified hybrid/EV technician, not roadside DIY.
Common causes
- Blown low-voltage power or ground fuse for the drive motor control module
- Corroded or loose ground at the module
- Damaged communication wiring to the drive motor control module
- Corroded or backed-out terminals at the module connector
- Failed internal communication circuitry in the module
- Another module on the bus disrupting network communication
- Low 12-volt system voltage from a weak auxiliary battery
- High-voltage system fault disabling the motor controller
Symptoms
- Reduced-power or fail-safe mode; loss of electric drive
- Vehicle won't enter Ready mode or won't move
- Hybrid/EV warning light and 'service powertrain' or reduced-power message
- Check engine light on, often with hybrid-system codes
- Scan tool can't communicate with the drive motor control module specifically
- Symptoms may be intermittent with a marginal connection
- Other U-codes stored in modules that depend on motor data
Diagnostic steps
- 1.Scan all modules; confirm the drive motor control module is the one that's unreachable while others respond.
- 2.Follow the manufacturer's high-voltage safety procedures before working near the inverter/motor controller.
- 3.Check the module's low-voltage power and ground fuses and the relevant relays.
- 4.Inspect the module ground and communication connector for corrosion, looseness, and damage.
- 5.Measure the communication bus lines at the module connector and verify continuity back to the bus.
- 6.Test the 12-volt auxiliary battery and charging, since low voltage can cause intermittent communication loss.
- 7.If power, ground, and wiring are good but the module still won't communicate, the module is the likely failure and will need replacement and programming by a qualified hybrid/EV technician.
Repair cost
$150 – $2,500
A blown fuse, corroded ground, or connector repair is the cheapest fix at $150-$400 once located. Wiring repair runs $250-$700. Diagnostic time commonly adds $200-$400 given the high-voltage safety steps. Replacing a drive motor control module (inverter/motor controller) is the most expensive outcome at $1,000-$2,500 or more including programming, and is a last resort after cheaper causes are ruled out. This work should be done by a qualified hybrid/EV shop.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with module communication / can bus diagnosis preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
Leave this one to a qualified shop. It typically involves emissions-critical components, refrigerant handling, or other work that requires manufacturer-grade tooling, training, or certification. DIY attempts often produce a more expensive problem than the original code.