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Home / DTC / U0110 — Lost Communication With Drive Motor Control Module A

U0110 — Lost Communication With Drive Motor Control Module A

Detailed page for trouble code U0110.

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10,569generic
22,461specific
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Code

U0110

Generic U — Network/User

Lost Communication With Drive Motor Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 17 EN: 29 RU: 30
AI status
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Page language: EN

Causes

  • Drive motor control module (inverter) powered off or faulted
  • Blown fuse or opened relay for motor controller power or ignition supply
  • Open, shorted, or high-resistance wiring in CAN bus to motor controller
  • Corroded or loose connector pins at motor controller or wiring harness
  • CAN bus termination resistor open or incorrect resistance
  • CAN high/low shorted to each other, to battery, or to ground

Symptoms

  • Malfunction indicator lamp (MIL) or network warning illuminated
  • Reduced or no drive power, limp or fail-safe mode
  • Drive motor controller does not show on scan tool or returns 'no response'
  • Multiple network communication DTCs present or intermittent faults
  • Vehicle may not shift, disable EV drive, or display drivetrain warnings
  • No live datastream from motor controller (RPM, inverter status, torque)

What to check

  • Read and record all network and motor-controller DTCs and freeze frame data
  • Verify battery/resting voltage and charge if low; check for voltage drops during key-on
  • Inspect fuses and relays that supply the drive motor control module and CAN bus
  • Visually inspect connectors and wiring at the motor controller and nearby harness for damage or corrosion
  • Use a scan tool to attempt communication with the motor controller and other modules on the same CAN segment
  • Measure CAN High and CAN Low voltages with key ON (engine off) at motor controller connector

Signal parameters

  • CAN bus idle voltages (key ON, no traffic): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
  • CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ~2.0 V)
  • Termination resistance: ≈ 60 ohms measured between CAN_H and CAN_L (two 120 ohm terminators in parallel)
  • Expected communication rate: vehicle-specific (common rates: 125 kbps, 250 kbps, 500 kbps — confirm with wiring diagram)
  • No response: absence of valid CAN frames from motor controller when queried by scan tool

Diagnostic algorithm

  1. Record all DTCs, freeze frame, and current bidirectional data. Note whether U0110 is active or historical.
  2. Verify battery voltage and key-on power rails. Recharge battery if voltage is low and recheck communication.
  3. Inspect fuses/relays for the drive motor controller power and any bus power supplies; replace or test as needed.
  4. Visually inspect the drive motor controller connector and harness for damage, pin push-out, corrosion, or water ingress.
  5. With connector connected and key ON, measure CAN_H and CAN_L at the motor controller connector; compare to expected ranges.
  6. Measure resistance between CAN_H and CAN_L with power off; confirm ≈60 ohms. If open or very high, trace for missing terminator.
  7. If voltages/resistance are abnormal, isolate wiring sections: disconnect suspected branches and re-measure to locate open/short.
  8. Use an oscilloscope on CAN_H and CAN_L to view waveform integrity and noise while attempting communication with a scan tool.
  9. If wiring and bus are good but module does not respond, verify power and ground pins at the module under load. Wiggle test for intermittent faults.
  10. If available, swap in a known-good drive motor control module or use a bench-tested unit following manufacturer safety and programming procedures (only if qualified).
  11. Clear codes and perform a road or functional test to confirm repair. If intermittent, monitor for recurrence and inspect related modules/devices that share the bus.
  12. Safety note: Drive motor controllers are often part of high-voltage systems. Do not perform internal HV component repairs unless trained and equipped. Isolate high-voltage system per manufacturer procedures before servicing.

Likely causes

  • Blown power fuse or failed contactor/relay supplying the drive motor controller
  • Connector contamination or pin pushed out at the motor controller
  • Broken CAN-H or CAN-L wire near motor or chassis harness entry
  • Failed drive motor control module (internal communication circuit)
  • Open/miswired CAN termination (missing 60 ohm total)
  • Short to chassis ground on CAN low or to battery on CAN high

Fault status

⚠️ Status
No communication received from Drive Motor Control Module A on the vehicle network. The fault may be active (current) or stored. Check power, grounds, connectors, and CAN bus integrity before replacing the module.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-4.0 hours

Similar codes

U0100 U0073 U0121 U0164 U0131
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