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Home / DTC / U0289 — Lost Communication With DC to AC Converter Control Module “B”

U0289 — Lost Communication With DC to AC Converter Control Module “B”

Detailed page for trouble code U0289.

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U0289

HYUNDAI U — Network/User

Lost Communication With DC to AC Converter Control Module “B”

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
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Completed 100%
Page language: EN

Causes

  • Open, short or high-resistance wiring on the CAN bus between the module and gateway
  • Poor power supply or ground to the DC–AC converter control module
  • Blown fuse or failed relay supplying the module
  • Faulty DC–AC converter control module (internal failure)
  • Corroded / loose connector or pin damage at the module or harness
  • CAN bus termination or network topology problem (missing resistor, incorrect wiring)

Symptoms

  • Inverter/converter warnings or MIL (malfunction indicator light)
  • Reduced electrical system functionality or loss of inverter operation
  • Hybrid/electric system may enter limp/limited mode or refuse to start
  • Related systems that rely on inverter data may show errors or be disabled
  • No CAN messages from the module when monitoring the bus

What to check

  • Read and record all U and B codes with a capable scan tool and check freeze-frame/history
  • Check for presence of the DC–AC converter module in the module list on the scan tool
  • Visually inspect the module connector, harness and grounding points for damage or corrosion
  • Verify fuses and relays that supply the converter control module
  • Measure +12V/ignition feed and ground at the module connector with a multimeter
  • Measure CAN_H and CAN_L voltages at the module connector (idle and active states)

Signal parameters

  • CAN bus physical layer: CAN_H approx. 2.5–3.5 V, CAN_L approx. 1.5–2.5 V at idle; dominant states show expected voltages (e.g. ~3.5V/1.5V)
  • Presence/absence of module CAN messages (module-specific message ID/heartbeat frequency) on vehicle CAN and gateway channels
  • Supply voltage to module: +12V (or vehicle-specific supply) present with ignition ON
  • Module ground resistance: low ohms to chassis
  • Battery pack voltage and inverter status bits if available from other modules
  • Message error counters (if supported) such as CAN error frames, bus-off state

Diagnostic algorithm

  1. Connect a factory-level or capable OEM scan tool. Record all U-codes and related module codes and any freeze-frame data.
  2. Check if the DC–AC converter control module appears in the tool’s network/module list. Note whether it responds to basic requests.
  3. Clear the code and attempt to reproduce. If the code returns, continue with physical checks.
  4. Visually inspect the module connector and wiring for damage, corrosion, water intrusion or loose pins. Repair as needed.
  5. Verify fuses/relays feeding the module and replace if blown. Confirm +12V/ignition power is present at the module connector with a DVOM.
  6. Verify solid chassis ground(s) at the module (measure voltage drop to chassis during cranking/operation).
  7. With ignition ON, measure CAN_H and CAN_L at the module connector. Compare idle and active voltages to specification. If voltages are out of range, trace wiring for opens/shorts or improper termination.
  8. Use a scope or CAN sniffer to look for module CAN frames/heartbeat. If no frames are present at the module, trace upstream (toward gateway) verifying continuity and presence of other module traffic on that bus segment.
  9. Perform a wiggle/pressure test on connectors/harness while monitoring CAN to locate intermittent faults. Repair harness/connector faults found.
  10. If wiring/power/ground and termination are verified good and the module still does not communicate, consult OEM service information for reprogramming or module replacement procedures. Replace the DC–AC converter control module only after confirming it is faulty.
  11. After repairs or replacement, clear codes, verify communication restored, and perform functional tests/road test to ensure fault does not return.

Likely causes

  • Faulty DC–AC converter control module “B”
  • Open/short in CAN High/Low wiring to the module
  • Missing or poor ground or +12V/ignition supply at the module
  • Connector corrosion or bent pins at the module harness
  • Blown fuse or relay feeding the control module
  • Gateway/module configuration or software error preventing messages

Fault status

⚠️ Status
Lost Communication With DC to AC Converter Control Module “B” — module not responding on vehicle CAN network
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0121 U0285 U0288 U0299
371

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