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Home / DTC / U0518 — Invalid Data Received From “Door Switch C”

U0518 — Invalid Data Received From “Door Switch C”

Detailed page for trouble code U0518.

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U0518

HYUNDAI U — Network/User

Invalid Data Received From “Door Switch C”

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

Causes

  • Damaged wiring or poor connector at Door Switch C
  • Corroded or loose connector pins (door harness or BCM/door module connector)
  • Failed door switch (mechanical or electrical fault)
  • Intermittent or low battery/vehicle voltage affecting data
  • Faulty Body Control Module (BCM) or door module
  • CAN/CAN-FD bus error, noise, or bus termination problem

Symptoms

  • Interior lamps or dome light behavior incorrect for affected door
  • Door ajar indicator incorrect or flashing
  • Central locking or keyless entry not operating consistently for that door
  • Related convenience features (auto lock/unlock, alarm) may behave incorrectly
  • Possible presence of other network communication fault codes

What to check

  • Read all stored U/C/B codes and freeze frame with a capable scan tool
  • Check vehicle battery voltage (should be ~12.4–12.8 V at rest, >13.5 V with engine running)
  • Visually inspect door harness, boots, and connectors for damage/corrosion
  • Check for other related U-codes (CAN/ECU communication errors)
  • Check grounds and power feeds at BCM and door module
  • Perform wiggle test on harness while observing live data/messages

Signal parameters

  • Door switch signal: typically a switched ground or pull-up to ~12 V when open — expected stable digital states (0 V or battery voltage) depending on design
  • CAN High / CAN Low differential idle ~2.5 V each, differential ~0 V idle; active differential ~1–3 V
  • Module supply voltage: ~9–15 V (depending on vehicle conditions)
  • Resistance of closed door switch: near 0 Ω (if switch is ground-type) or
  • Continuity between door switch pin and BCM/module pin should be present (< a few ohms with harness disconnected at both ends)

Diagnostic algorithm

  1. Use an OEM-level scan tool to read U0518 and any related codes; note freeze frame and occurrence conditions.
  2. Verify battery state and charging system before electrical tests (low voltage can create network errors).
  3. Inspect door wiring, boots, and connectors for damage, corrosion, or pin deformation at the affected door and at the BCM/door module.
  4. With harness connected, monitor door switch input on scan tool (live data) while opening/closing the door. Look for expected state changes and note any invalid values or no-change conditions.
  5. Perform a wiggle test: move harness and connectors while monitoring live data to find intermittent faults.
  6. If live data abnormal or absent, backprobe the door switch connector and measure voltage/continuity: check supply, signal, and ground pins per wiring diagram. Verify switch open/closed voltage behavior.
  7. If wiring and switch read correct at the door but module still reports invalid data, check continuity from door connector to BCM/door module connector. Repair any high resistance or opens.
  8. Check CAN bus health: measure CANH/CANL voltages and look for excessive noise, shorts, or improper termination. Use oscilloscope if available.
  9. Inspect for other modules causing bus errors by disconnecting suspect modules one at a time and observing if the code clears (follow OEM safe procedures).
  10. If wiring, connectors, and switch are good, consider reflashing/reprogramming the affected module per OEM procedures before replacing hardware.
  11. After repairs, clear codes and test drive/operate doors to confirm code does not return. Re-scan to verify no related faults remain.
  12. If intermittent and unresolved, consult manufacturer TSBs/wiring diagrams and consider professional diagnostics or module replacement only after confirming root cause.

Likely causes

  • Open/short or high resistance in door switch wiring (most common)
  • Corrosion or poor pin contact in door harness connector
  • Failed door switch (stuck or intermittent open/short)
  • Intermittent BCM or door module power/ground issue
  • CAN network messages malformed due to noise or a failing node

Fault status

⚠️ Status
Invalid data received from Door Switch C — communication or signal integrity fault between door switch and network/module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
371

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