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Home / DTC / U0215 — Lost Communication With “Door Switch A”

U0215 — Lost Communication With “Door Switch A”

Detailed page for trouble code U0215.

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U0215

HYUNDAI U — Network/User

Lost Communication With “Door Switch A”

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

Causes

  • Open or shorted wiring between BCM (or gateway) and door module/switch
  • Corroded, loose or damaged connectors at the door, BCM or gateway
  • Failed door switch, door module (if separate), or BCM
  • CAN bus short to battery or ground, or high resistance on CANH/CANL
  • Missing/failed CAN termination resistor(s)
  • Low battery/poor battery connections or blown fuse supplying modules

Symptoms

  • Door open/closed indicator incorrect or not updating
  • Interior lights, auto-lock/unlock or alarm may not respond properly
  • Possible inability to lock/unlock door from switches
  • Stored U0215 DTC and related communication warnings on scanner
  • Possible other network DTCs if CAN integrity is compromised

What to check

  • Scan all modules for U-codes and related DTCs to identify scope
  • Verify battery voltage (12.6V nominal) and good battery connections
  • Inspect fuses and relays supplying BCM, door module and sensors
  • Visually inspect door harness at hinge for chafing, pinched wires, water intrusion
  • Check connectors at door switch/door module and BCM for corrosion, bent pins or poor mating
  • Use a scan tool to view live data for the door switch status and module presence

Signal parameters

  • CAN bus idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (both centered); dominant state ≈ CANH 3.5 V / CANL 1.5 V
  • Differential voltage during activity: up to ≈ 2 V (dominant), near 0 V when recessive
  • Typical automotive high-speed CAN baud rate: commonly 500 kb/s on body/gateway networks (verify vehicle spec)
  • Termination present as two 120 Ω resistors in parallel ≈ 60 Ω between CANH and CANL

Diagnostic algorithm

  1. Read and record U0215 and any other related codes from all modules. Note freeze frame/live data.
  2. Clear codes and attempt to reproduce the fault while watching live data for Door Switch A and module presence.
  3. Visually inspect door harness at the B-pillar/hinge for damage; move door repeatedly to look for intermittent wiring faults.
  4. Inspect and disconnect the door switch and/or door module connector; check for corrosion, bent pins, water, and secure mating.
  5. With connectors disconnected, check for proper power and ground supply to the door module/switch circuit (verify voltage and ground continuity).
  6. Backprobing: measure CANH and CANL at the door module connector and at the BCM/gateway with key ON. Compare to signal parameter expectations.
  7. Measure resistance across CANH and CANL with power off to verify termination ≈ 60 Ω. Check for shorts to battery or ground.
  8. Wiggle test harness/connectors while monitoring communication/live data to find intermittent faults.
  9. If wiring and connectors are good but no communication from the door module, attempt to communicate directly with the door module using a capable scan tool. If module is non-responsive, consider module replacement or reflashing.
  10. If a module is replaced, reprogram/configure per manufacturer procedure and recheck entire network for additional faults.
  11. After repairs, clear DTCs and verify that Door Switch A reports correctly and the U0215 does not return under normal conditions.

Likely causes

  • Broken or disconnected wiring in the door harness (common at hinge/door jamb)
  • Corroded/loose connector at the door switch or door module
  • Faulty door switch or door module
  • CAN bus fault (short, open, poor termination) between modules
  • Blown fuse or poor power/ground to the BCM or door module

Fault status

⚠️ Status
Lost Communication With 'Door Switch A' — the control network is not receiving messages from the door switch/module. Check wiring, connectors, power/ground, CAN bus integrity, and module operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours
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