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Home / DTC / U0200 — Lost Communication With “Door Control Module B”

U0200 — Lost Communication With “Door Control Module B”

Detailed page for trouble code U0200.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
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Code

U0200

HYUNDAI U — Network/User

Lost Communication With “Door Control Module B”

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

Causes

  • Faulty or disconnected Door Control Module B (DCM-B)
  • Broken, shorted, or corroded CAN/communication wiring or connectors
  • Loss of module power or ground (fused power, ignition feed, or ground open)
  • Failed or intermittent CAN bus termination or short to battery/ground
  • Fault in another module on the same network interfering with communication
  • Water intrusion or physical damage to door harness or module

Symptoms

  • Door functions (power locks, windows, mirror folding, courtesy lights) in one or more doors do not operate
  • Keyless entry or remote lock/unlock not working for affected doors
  • Multiple network-related DTCs or communication errors present
  • Instrument cluster or BCM may display warning messages related to door modules
  • Intermittent operation or sporadic faults that change with door position or harness movement

What to check

  • Use a scan tool to read all U-codes and frozen data; identify which module(s) report loss of comm and time stamps
  • Check for related codes (other door modules, BCM, IPC, ABS) to locate affected network segment
  • Visually inspect door harness, connectors, and module for corrosion, water entry, pin damage, or chafing at hinge areas
  • Verify module power and ground at the Door Control Module B connector with a DMM (battery voltage, ground continuity)
  • Measure CAN bus voltages at the module connector: CANH, CANL and differential resistance across CANH–CANL
  • Check wiring continuity between the module and nearest gateway/BCM and for shorts to battery/ground

Signal parameters

  • Typical CAN bus idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (recessive). On dominant bits CANH rises ≈ 3.5 V and CANL falls ≈ 1.5 V — verify with oscilloscope
  • Differential voltage during dominant state ≈ 2.0 V (varies by network and transceiver)
  • Termination resistance between CANH and CANL at room temperature ≈ 60 ohms (two 120 Ω terminators in parallel)
  • Module supply voltage: battery voltage at switched/constant feed (check vehicle wiring diagram for correct pin values)
  • Check manufacturer wiring diagram for correct CAN bus speed (baud) for the body network before advanced signal analysis

Diagnostic algorithm

  1. Connect a capable scan tool and record all communication-related DTCs and freeze-frame data; confirm U0200 is current or intermittent.
  2. Identify the physical location and connector pinout for Door Control Module B using the vehicle wiring diagrams.
  3. With ignition ON, verify battery voltage at the module power pin(s) and good chassis/engine ground at module ground pin(s).
  4. Inspect the connector and harness for corrosion, bent pins, water intrusion, or damage at hinge/door entry points; repair as needed.
  5. Backprobe the CANH and CANL pins at the module connector. With key ON, check idle voltages with a DMM; if voltages abnormal, investigate wiring and termination.
  6. Measure resistance between CANH and CANL with power off. Expect ~60 Ω. Infinite or very low/resistances indicate open or short conditions respectively.
  7. If bus voltages and termination are correct at the module connector, disconnect the Door Control Module B and verify whether other modules regain communication—this isolates a faulty module from a bus fault.
  8. Perform wiggle testing of the harness while monitoring live data/messages for intermittent faults; check hinge area carefully.
  9. If wiring and power/ground are good but the module remains unresponsive, consider reflashing software (if manufacturer procedure available) or replacing the module.
  10. After repairs, clear codes and road test; verify that U0200 does not return and all door functions and network messages operate normally.

Likely causes

  • Open or corroded connector at the door control module (moisture or pin damage)
  • CANH or CANL short to power or ground in door harness
  • No battery power or ignition feed to the module due to blown fuse or broken wire
  • Damaged door harness where it flexes (hinge area) causing intermittent loss
  • Failed module electronics inside Door Control Module B

Fault status

⚠️ Status
Lost communication with Door Control Module B on the vehicle CAN network. Messages from/to DCM-B are not being received.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0164 U0155
371

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