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Home / DTC / U0202 — Lost Communication With Door Control Module D

U0202 — Lost Communication With Door Control Module D

Detailed page for trouble code U0202.

34,405codes
59brands
11,914generic
22,491specific
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U0202

Generic U — Network/User

Lost Communication With Door Control Module D

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

Causes

  • Failed or unpowered door control module (Door Control Module D)
  • Blown fuse or lost module supply/ground
  • Open/shorted wiring or damaged connector to the module
  • Corroded or loose connector pins at module or splice
  • CAN or LIN bus fault (short to voltage/ground, open, missing termination)
  • Intermittent connection (water intrusion, broken wire)

Symptoms

  • Door functions inoperative for the affected door (lock/unlock, window, mirror, puddle lamp)
  • Door ajar, lock or module warnings on dash or message center
  • Remote keyless entry or central locking failure for that door
  • Intermittent operation of door features
  • Related DTCs stored in body control module or other modules

What to check

  • Read and record all stored DTCs and freeze frame data from all modules
  • Check for additional U-codes that indicate broader network issues
  • Visually inspect the module connector and wiring for corrosion, damage, or pin push-out
  • Verify fuses and power/ground at the door module connector with a DVOM
  • Use a scan tool to determine if the door module is present on the network and to watch for module messages
  • Measure CAN_H and CAN_L voltages and waveform with scope or CAN tester at the module connector

Signal parameters

  • CAN bus nominal idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
  • CAN dominant state typical: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (values vary by vehicle)
  • Termination resistance: approximately 60 ohms measured between CAN_H and CAN_L (two 120-ohm terminators in parallel)
  • Common CAN bus speeds: 500 kb/s or 250 kb/s (verify vehicle-specific baud rate)
  • Door module should transmit periodic status/heartbeat messages (frequency varies by vehicle; often ≥1 Hz)
  • No or irregular heartbeat/messages indicates communication loss

Diagnostic algorithm

  1. Confirm code and gather vehicle history: retrieve U0202 plus any other network codes and note when they occur.
  2. Determine scope: identify which physical module is 'Door Control Module D' from service information (which door/connector).
  3. Visual inspection: inspect harness, connectors, pins, and module for damage, corrosion, or moisture.
  4. Verify module power and ground: with ignition ON, measure battery voltage at the module power pin(s) and check ground continuity to chassis.
  5. Check related fuses and relays supplying the module and replace if blown.
  6. Scan-tool network check: confirm whether the module responds to a scan tool or is listed in the network node list; attempt to read module data if present.
  7. Monitor bus traffic: use an advanced scan tool or CAN bus analyzer to see if the door module transmits messages or heartbeats; note message frequency and any errors.
  8. Measure CAN signals: use an oscilloscope to inspect CAN_H/CAN_L waveforms at the module connector for valid levels and differential signals; look for shorts, dominant stuck, or excessive noise.
  9. Isolate the fault: if bus wiring suspected, disconnect the door module and observe if network behavior changes; if disconnecting the module restores network, suspect module or local wiring.
  10. Repair wiring/connectors: repair any damaged wires, corrosion, or poor grounds; replace connector terminals or splices as needed.
  11. Replace or reprogram module: if wiring and power/ground are good and module does not respond, replace or reflash the door control module per manufacturer procedure.
  12. Clear codes and verify: erase DTCs, perform function tests and a road or operational test to confirm repair; re-scan for reappearance of U0202.

Likely causes

  • Fuse or power/ground missing at the door module
  • Corroded or disconnected module connector
  • Damaged CAN bus wiring between module and body control module
  • Failed door control module
  • Network termination or short on CAN_H/CAN_L

Fault status

⚠️ Status
Lost Communication With Door Control Module D
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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Code

U0202

HYUNDAI U — Network/User

Lost Communication With “Door Control Module D”

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

Causes

  • Failed or unpowered door control module (Door Control Module D)
  • Blown fuse or lost module supply/ground
  • Open/shorted wiring or damaged connector to the module
  • Corroded or loose connector pins at module or splice
  • CAN or LIN bus fault (short to voltage/ground, open, missing termination)
  • Intermittent connection (water intrusion, broken wire)

Symptoms

  • Door functions inoperative for the affected door (lock/unlock, window, mirror, puddle lamp)
  • Door ajar, lock or module warnings on dash or message center
  • Remote keyless entry or central locking failure for that door
  • Intermittent operation of door features
  • Related DTCs stored in body control module or other modules

What to check

  • Read and record all stored DTCs and freeze frame data from all modules
  • Check for additional U-codes that indicate broader network issues
  • Visually inspect the module connector and wiring for corrosion, damage, or pin push-out
  • Verify fuses and power/ground at the door module connector with a DVOM
  • Use a scan tool to determine if the door module is present on the network and to watch for module messages
  • Measure CAN_H and CAN_L voltages and waveform with scope or CAN tester at the module connector

Signal parameters

  • CAN bus nominal idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (recessive state)
  • CAN dominant state typical: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (values vary by vehicle)
  • Termination resistance: approximately 60 ohms measured between CAN_H and CAN_L (two 120-ohm terminators in parallel)
  • Common CAN bus speeds: 500 kb/s or 250 kb/s (verify vehicle-specific baud rate)
  • Door module should transmit periodic status/heartbeat messages (frequency varies by vehicle; often ≥1 Hz)
  • No or irregular heartbeat/messages indicates communication loss

Diagnostic algorithm

  1. Confirm code and gather vehicle history: retrieve U0202 plus any other network codes and note when they occur.
  2. Determine scope: identify which physical module is 'Door Control Module D' from service information (which door/connector).
  3. Visual inspection: inspect harness, connectors, pins, and module for damage, corrosion, or moisture.
  4. Verify module power and ground: with ignition ON, measure battery voltage at the module power pin(s) and check ground continuity to chassis.
  5. Check related fuses and relays supplying the module and replace if blown.
  6. Scan-tool network check: confirm whether the module responds to a scan tool or is listed in the network node list; attempt to read module data if present.
  7. Monitor bus traffic: use an advanced scan tool or CAN bus analyzer to see if the door module transmits messages or heartbeats; note message frequency and any errors.
  8. Measure CAN signals: use an oscilloscope to inspect CAN_H/CAN_L waveforms at the module connector for valid levels and differential signals; look for shorts, dominant stuck, or excessive noise.
  9. Isolate the fault: if bus wiring suspected, disconnect the door module and observe if network behavior changes; if disconnecting the module restores network, suspect module or local wiring.
  10. Repair wiring/connectors: repair any damaged wires, corrosion, or poor grounds; replace connector terminals or splices as needed.
  11. Replace or reprogram module: if wiring and power/ground are good and module does not respond, replace or reflash the door control module per manufacturer procedure.
  12. Clear codes and verify: erase DTCs, perform function tests and a road or operational test to confirm repair; re-scan for reappearance of U0202.

Likely causes

  • Fuse or power/ground missing at the door module
  • Corroded or disconnected module connector
  • Damaged CAN bus wiring between module and body control module
  • Failed door control module
  • Network termination or short on CAN_H/CAN_L

Fault status

⚠️ Status
Lost Communication With Door Control Module D
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0140 U0155 U0164
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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