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Home / DTC / B2581 — Rear RH Tail Lamp Circuit Open

B2581 — Rear RH Tail Lamp Circuit Open

Detailed page for trouble code B2581.

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22,491specific
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Code

B2581

HYUNDAI B — Body

Rear RH Tail Lamp Circuit Open

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out tail lamp bulb or LED module
  • Open or broken wiring between the rear RH lamp and the body control module (BCM)
  • Corroded, loose or damaged connector at the lamp socket
  • Faulty lamp socket or poor ground connection
  • Blown fuse or relay (less common for a single lamp)
  • Faulty BCM or lamp driver circuit (internal to module)

Symptoms

  • Right rear tail lamp does not illuminate with parking/tail lights
  • Dash lamp-out message or bulb warning (if equipped)
  • Intermittent operation or works when wiring is wiggled
  • Possible other lighting anomalies if BCM driver is failing

What to check

  • Verify customer concern with engine off and tail lights ON
  • Inspect RH tail lamp assembly: lens, bulb or LED module and socket
  • Visually inspect wiring harness and connectors for damage, corrosion or poor mating
  • Check related fuses and relays in fuse/relay boxes
  • Scan BCM for active/frozen DTCs and lamp status (compare LH vs RH outputs)
  • Backprobe lamp socket to measure voltage and ground with lights ON

Signal parameters

  • Expected battery voltage at lamp power pin with tail lights ON: ~11–14 V
  • Expected continuity from lamp ground to chassis:
  • Typical filament tail bulb resistance (cold): 1–10 Ω depending on bulb type
  • Open-circuit condition: near infinite resistance or 0 V at power pin when commanded

Diagnostic algorithm

  1. Recreate symptom and confirm code B2581 with scan tool. Note any other related lamp codes.
  2. Visually inspect RH tail lamp assembly, sockets and mating connectors for corrosion, water intrusion or damage. Replace bulb or LED module if visibly failed.
  3. Check fuses/relays for the lighting circuit. Replace if blown and retest. If fuse blows again, suspect short to ground.
  4. With tail lights ON, backprobe the power terminal at RH lamp socket. Expected: ~12 V. If 12 V present and lamp not lit, replace bulb/LED module or socket.
  5. If no voltage at socket, check continuity between socket power pin and BCM lamp output pin. If open, locate repair section of harness (common break points: trunk hinge, bumper area) and repair.
  6. Verify ground continuity from lamp ground terminal to chassis; repair any high-resistance grounds.
  7. If wiring and connectors are good but no output from BCM, test BCM lamp driver output per factory procedure or substitute BCM if confirmed faulty.
  8. After repair, clear codes and verify repair by cycling lights and rechecking for DTC and lamp operation.
  9. If intermittent: perform wiggle tests on harnesses while observing socket voltage and scan tool live data to find intermittent opens.

Likely causes

  • Burned-out bulb or failed LED module
  • Corroded or disconnected connector at RH tail lamp
  • Broken wire or chafed harness near trunk hinge or bumper
  • Bad ground at tail lamp assembly

Fault status

⚠️ Status
BCM detected open circuit on Rear Right (RH) tail lamp circuit — no expected voltage/continuity when tail lights commanded ON.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B2580 B2591 B2551 B2611
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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Code

B2581

Other B — Body

Passenger Seat Occupant Detection Circuit Short To Ground

Brand: Other
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Burned-out tail lamp bulb or LED module
  • Open or broken wiring between the rear RH lamp and the body control module (BCM)
  • Corroded, loose or damaged connector at the lamp socket
  • Faulty lamp socket or poor ground connection
  • Blown fuse or relay (less common for a single lamp)
  • Faulty BCM or lamp driver circuit (internal to module)

Symptoms

  • Right rear tail lamp does not illuminate with parking/tail lights
  • Dash lamp-out message or bulb warning (if equipped)
  • Intermittent operation or works when wiring is wiggled
  • Possible other lighting anomalies if BCM driver is failing

What to check

  • Verify customer concern with engine off and tail lights ON
  • Inspect RH tail lamp assembly: lens, bulb or LED module and socket
  • Visually inspect wiring harness and connectors for damage, corrosion or poor mating
  • Check related fuses and relays in fuse/relay boxes
  • Scan BCM for active/frozen DTCs and lamp status (compare LH vs RH outputs)
  • Backprobe lamp socket to measure voltage and ground with lights ON

Signal parameters

  • Expected battery voltage at lamp power pin with tail lights ON: ~11–14 V
  • Expected continuity from lamp ground to chassis:
  • Typical filament tail bulb resistance (cold): 1–10 Ω depending on bulb type
  • Open-circuit condition: near infinite resistance or 0 V at power pin when commanded

Diagnostic algorithm

  1. Recreate symptom and confirm code B2581 with scan tool. Note any other related lamp codes.
  2. Visually inspect RH tail lamp assembly, sockets and mating connectors for corrosion, water intrusion or damage. Replace bulb or LED module if visibly failed.
  3. Check fuses/relays for the lighting circuit. Replace if blown and retest. If fuse blows again, suspect short to ground.
  4. With tail lights ON, backprobe the power terminal at RH lamp socket. Expected: ~12 V. If 12 V present and lamp not lit, replace bulb/LED module or socket.
  5. If no voltage at socket, check continuity between socket power pin and BCM lamp output pin. If open, locate repair section of harness (common break points: trunk hinge, bumper area) and repair.
  6. Verify ground continuity from lamp ground terminal to chassis; repair any high-resistance grounds.
  7. If wiring and connectors are good but no output from BCM, test BCM lamp driver output per factory procedure or substitute BCM if confirmed faulty.
  8. After repair, clear codes and verify repair by cycling lights and rechecking for DTC and lamp operation.
  9. If intermittent: perform wiggle tests on harnesses while observing socket voltage and scan tool live data to find intermittent opens.

Likely causes

  • Burned-out bulb or failed LED module
  • Corroded or disconnected connector at RH tail lamp
  • Broken wire or chafed harness near trunk hinge or bumper
  • Bad ground at tail lamp assembly

Fault status

⚠️ Status
BCM detected open circuit on Rear Right (RH) tail lamp circuit — no expected voltage/continuity when tail lights commanded ON.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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B2580 B2591 B2551 B2611
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