U0110 – Lost Communication With Drive Motor Control Module

System: Network | Standard: ISO/SAE Controlled | Fault type: General

Definition source: SAE J2012/J2012DA (industry standard)

DTC U0110 indicates the vehicle detected a loss of communication with the Drive Motor Control Module over the vehicle network. In practical terms, one or more other control modules expected to exchange messages with the drive motor controller but stopped receiving them for long enough to flag a fault. This is a network-level problem report, not a direct measurement of a specific sensor or actuator, and it does not prove the module itself has failed. The exact enabling conditions, timeouts, and which functions are limited when communication is lost vary by vehicle, so always confirm the affected network, module location, and pinouts using the correct service information before testing or replacing parts.

What Does U0110 Mean?

U0110 – Lost Communication With Drive Motor Control Module means one or more controllers on the vehicle’s communication network have determined that messages from the Drive Motor Control Module are missing or invalid. Under SAE J2012, the U-category identifies a network communication fault, and this specific entry points to the drive motor controller as the module that is no longer being reliably “heard” on the network. The code is set when expected network traffic is interrupted, which can result from wiring/network faults, power or ground issues affecting the module, connector problems, or (less commonly) an internal module/software issue. Diagnosis focuses on restoring proper network communication and verifying module power/ground integrity.

Quick Reference

  • Subsystem: Network communication path to/from the Drive Motor Control Module (vehicle communications bus, related module power/ground, and connectors).
  • Common triggers: Module not powered up, missing ground, network bus open/short, high resistance at terminals, disconnected connector, or network traffic interruption.
  • Likely root-cause buckets: Wiring/connector faults, power/ground distribution issues, network bus faults, module internal fault, or module software/configuration issues (varies by vehicle).
  • Severity: Often high; can cause reduced propulsion, limited torque, warning indicators, or a no-start/no-ready condition depending on vehicle strategy.
  • First checks: Scan for multiple network DTCs, confirm module is present in the scan tool topology, verify fuses/feeds and grounds, and inspect connectors/harness routing.
  • Common mistakes: Replacing the Drive Motor Control Module before verifying power/ground and the network bus integrity, or ignoring other U-codes that identify the true network segment fault.

Theory of Operation

The Drive Motor Control Module typically exchanges operational status and requests over the vehicle network with other controllers (for example, those managing torque requests, system enable, and diagnostics). When operating normally, it periodically transmits and receives messages that confirm it is online and responding. Other modules monitor this traffic and may also expect direct diagnostic responses when queried by a scan tool.

U0110 is set when those expected messages stop arriving or are not usable, indicating a communication breakdown rather than a specific “circuit high/low” sensor condition. Common reasons include the module losing power or ground, a disrupted network bus (open, short, or excessive resistance), poor terminal contact, or a module that is locked up and not communicating. Monitoring logic and reaction (warnings/limited function) vary by vehicle and should be verified in service information.

Symptoms

  • Warning lamps related to propulsion or system status illuminated.
  • Reduced power or limited propulsion performance due to fail-safe operation.
  • No-start or no-ready condition if the system requires drive motor controller communication to enable operation.
  • Intermittent operation where the condition comes and goes with bumps, vibration, or temperature changes.
  • Communication loss where a scan tool cannot communicate with the Drive Motor Control Module or it appears offline.
  • Multiple U-codes stored in other modules indicating broader network communication issues.

Common Causes

  • Open, high-resistance, or intermittent connection in the network communication wiring between the drive motor control module and the rest of the network
  • Poor terminal fit, corrosion, water intrusion, or pin damage at the drive motor control module connector or at a network splice/junction (varies by vehicle)
  • Short between communication circuits or a short to power/ground affecting the network segment used by the drive motor control module
  • Loss of power feed(s) to the drive motor control module (blown fuse, failed relay, damaged feed circuit, or excessive voltage drop under load)
  • Loss of ground path(s) for the drive motor control module (loose fastener, ground point corrosion, damaged ground circuit, or high voltage drop)
  • Network bus fault caused by another module, connector, or harness section on the same bus disrupting communication
  • Drive motor control module internal fault that prevents it from communicating (confirm with power/ground and network checks first)
  • Software/configuration issue after service work (module replacement, programming, or network configuration mismatch; varies by vehicle)

Diagnosis Steps

Useful tools include a scan tool capable of full-network scans and module identification, a digital multimeter for power/ground and voltage-drop checks, and manufacturer service information for connector views, pinouts, splice locations, and network topology. If available, a breakout lead kit and back-probing pins help reduce connector damage during testing.

  1. Confirm the complaint and document conditions: Verify the DTC is U0110 and record freeze frame and any stored/pending network or module-related codes. Note warning indicators, reduced-power behavior, or no-start conditions if present.
  2. Run a full network scan: Check which modules communicate and which do not. Attempt to establish communication with the drive motor control module directly. If the scan tool cannot connect, treat the issue as a communication loss or module offline condition rather than a single-sensor fault.
  3. Check for supporting DTCs and prioritize: If there are power supply, ignition feed, battery voltage, or other network communication DTCs, diagnose those first. A shared power/ground or bus issue can set multiple communication codes.
  4. Verify DTC behavior (hard vs intermittent): Clear codes and cycle ignition as specified by service information. Recheck for immediate reset. If the code is intermittent, plan to use live-data logging and a wiggle test to reproduce the dropout.
  5. Perform a focused visual inspection: With power off as required by service procedures, inspect the drive motor control module connector(s) and nearby harness routing for damage, chafing, pinch points, aftermarket splices, loose locks, backed-out terminals, corrosion, or moisture. Inspect known network splices/junctions on that bus (location varies by vehicle).
  6. Check module power feeds under load: Using wiring diagrams, identify all power feeds to the drive motor control module (battery and ignition-switched, if applicable). Confirm fuses/relays are correct and seated. Use voltage-drop testing from the power source to the module pin while the circuit is loaded (key-on and/or commanded on per service info) to catch high resistance that a simple continuity test can miss.
  7. Check module grounds with voltage-drop testing: Measure voltage drop from the module ground pin(s) to the battery negative while the module is powered and the circuit is loaded. If voltage drop is excessive, inspect and service the ground point, fasteners, and ground splice(s) as applicable.
  8. Verify network circuit integrity at the module connector: With the module disconnected as required, check for signs of shorts to power/ground and shorts between communication circuits using the multimeter and the service-information procedure. Avoid guessing “normal” values; follow the specified test method for the vehicle’s network design.
  9. Isolate the network segment if needed: If service information shows multiple modules share the same bus branch, disconnect modules or junction connectors one at a time (following the approved procedure) to see whether communication returns. This helps identify whether another node or harness section is pulling the network down.
  10. Wiggle test with live logging: Reconnect components and log network/module status PIDs (and any communication counters, if available) while gently manipulating the harness, connectors, and splice areas. If U0110 resets or the module drops offline during movement, focus on that exact area for terminal fit, broken conductors, or intermittent shorts.
  11. Confirm repair and re-verify: After repairing wiring, terminals, power/ground, or a network fault, clear codes and complete the enable criteria/drive cycle specified by service information. Repeat the full network scan to confirm stable communication and that U0110 does not return.

Professional tip: If the scan tool intermittently identifies the drive motor control module (appears/disappears on the network list), prioritize power/ground voltage-drop testing and connector terminal fit checks before suspecting the module itself. Intermittent contact and high resistance frequently mimic module failure by causing brief resets or bus disruptions that look like “lost communication.”

Need network wiring diagrams and module connector views?

Communication stop and network faults require module connector pinouts, bus wiring routes, and power/ground diagrams. A repair manual helps you trace the exact circuit path before replacing any ECU.

Factory repair manual access for U0110

Check repair manual access

Possible Fixes & Repair Costs

Repair costs for U0110 vary widely because the correct fix depends on where communication is being lost (power/ground, network wiring, connectors, or a module issue). Parts availability, access time, and required setup or programming can also change the final total.

  • Restore power and ground to the drive motor control module by repairing open circuits, poor connections, or damaged terminals found during testing
  • Repair network wiring faults (open circuit, short-to-ground, short-to-power, or high resistance) affecting the communication lines between modules
  • Clean, re-seat, and secure connectors; correct loose pin fit, corrosion, or water intrusion after verifying the affected connector is in the communication path
  • Correct excessive voltage drop on the module’s power or ground side by repairing splices, grounds, or damaged wiring (verify with voltage-drop testing)
  • Perform required module configuration, setup, or relearn procedures after restoring communication (varies by vehicle and service information)
  • Replace the drive motor control module only after confirming proper power/ground and network integrity and verifying the module will not communicate when commanded

Can I Still Drive With U0110?

Driveability and safety impact can range from minimal warnings to reduced propulsion or a no-start condition, depending on how the vehicle uses the drive motor control module. If you have loss of power, repeated warning messages, stalling, no-start, or any brake/steering/traction warnings, do not continue driving—have the vehicle inspected and repaired. If the vehicle seems normal, drive cautiously and avoid high-demand situations while arranging diagnosis, since communication loss can become intermittent and worsen without notice.

What Happens If You Ignore U0110?

Ignoring U0110 can lead to recurring warning indicators, intermittent loss of propulsion assistance, reduced-power operation, or a future no-start if the module stops communicating entirely. Continued operation with a network fault can also complicate diagnosis later, as multiple modules may log additional communication codes when they lose data they need for coordination.

Compare nearby lost drive trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • U011E – Lost Communication With Motor Control Module "E"
  • U011D – Lost Communication With Motor Control Module "D"
  • U017D – Lost Communication With Control Module “M”
  • U017C – Lost Communication With Control Module “L”
  • U017B – Lost Communication With Control Module “K”
  • U017A – Lost Communication With Control Module “J”

Key Takeaways

  • U0110 indicates a lost communication condition with the drive motor control module, not a confirmed mechanical failure.
  • Most root causes fall into power/ground supply issues, connector problems, or network wiring faults.
  • Verify the module is actually offline by checking communication, not just the presence of the code.
  • Voltage-drop testing and connector inspection are often more useful than replacing parts early.
  • Driving risk varies by vehicle; treat reduced power, stalling, or no-start symptoms as “do not drive.”

Vehicles Commonly Affected by U0110

  • Vehicles that use a dedicated drive motor control module to manage propulsion torque
  • Platforms with multiple networked control modules sharing propulsion and torque requests
  • Vehicles with higher reliance on network messages for start authorization and propulsion enable
  • Configurations with long wiring runs between powertrain components and central controllers
  • Vehicles operated in harsh environments where connectors are exposed to moisture, corrosion, or vibration
  • Vehicles with recent collision damage or underbody impact affecting harness routing
  • Vehicles with recent electrical repairs, accessory installs, or harness modifications near network wiring
  • Vehicles with low-voltage events or repeated battery disconnects that may expose weak connections

FAQ

Does U0110 mean the drive motor control module is bad?

No. U0110 only indicates that communication with the drive motor control module was lost. The underlying cause can be a power supply/ground issue, a network wiring or connector problem, or an intermittent connection. Replace the module only after testing confirms it has correct power/ground and the network is intact but the module still will not communicate.

Can a weak battery cause U0110?

It can contribute. Low system voltage or unstable power can cause modules to drop offline or reboot, which may appear as lost communication. The correct approach is to verify battery and charging system health, then confirm the drive motor control module’s power and ground circuits can carry load with minimal voltage drop.

Why are there multiple U-codes along with U0110?

When one module stops communicating, other modules that depend on its messages often set additional communication codes. Those related codes may be secondary effects rather than separate failures. Prioritize diagnosing the module that is reported as “lost” and the network/power circuits that support it.

Will clearing the code fix U0110?

Clearing codes may temporarily turn off warnings, but it does not repair the cause of lost communication. If the fault is intermittent, it will usually return when conditions repeat (vibration, temperature changes, or electrical load). Use clearing only as part of a test plan to see what returns after a controlled drive cycle or a wiggle test.

What is the first repair to try for U0110?

Start with verification and basics: confirm the module is not communicating, check its power and ground integrity with voltage-drop testing, and inspect connectors and harness routing for looseness, corrosion, or damage. If those items are good, move to network circuit checks for opens/shorts and confirm proper communication resumes before considering module replacement.

For a lasting repair, fix only what testing proves is failing, then confirm stable communication with a post-repair scan and a road test while monitoring network status and module data.