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Home / DTC / B2579 — Rear RH Tail Lamp Circuit Short To Ground

B2579 — Rear RH Tail Lamp Circuit Short To Ground

Detailed page for trouble code B2579.

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11,895generic
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Code

B2579

HYUNDAI B — Body

Rear RH Tail Lamp Circuit Short To Ground

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

Causes

  • Wire insulation damaged and contacting chassis ground (pinch, chafe, corrosion)
  • Corroded or bent connector pin making unintended ground contact
  • Failed or shorted tail lamp bulb or LED module
  • Water intrusion in lamp assembly or connector
  • Aftermarket trailer harness or accessory wiring incorrectly tied into circuit
  • Faulty BCM or lighting driver (rare)

Symptoms

  • Right rear tail lamp does not illuminate (parking lights, tail lights)
  • Bulb may be dim or flicker or fuses related to rear lighting are blown
  • Dash warning for exterior lamp or BCM malfunction message
  • Other lighting circuits on same harness may show abnormal behavior
  • Lamp works intermittently or only when connector is manipulated

What to check

  • Scan BCM for code data and freeze frame, verify B2579 is current/confirmed
  • Visually inspect RH rear lamp, lens, socket, and connector for corrosion, water, or damage
  • Remove lamp bulb/module and inspect filament or LED board for signs of short or burn
  • Check related fuses and fusible links for continuity and signs of overheating
  • Measure battery voltage at tail lamp connector with lights ON
  • Perform continuity/ohm test from harness lamp positive pin to ground with lamp disconnected

Signal parameters

  • Ignition ON / parking lights ON: ~11–14 V at tail lamp positive terminal (with lamp connected)
  • With lamp removed: expected open/infinite resistance from positive lamp terminal to chassis ground (no short)
  • Resistance of a good 12V incandescent tail filament: typically a few ohms (varies by bulb); LED modules will show higher resistance or electronic driver characteristics
  • Tail lamp steady current draw (typical incandescent tail lamp ~0.3–0.6 A; brake filament higher). A near‑zero resistance will draw excessive current or blow a fuse
  • If short present: resistance from positive circuit to ground will be near 0 Ω

Diagnostic algorithm

  1. Step 1 — Verify: Use a scan tool to confirm B2579, note freeze frame and whether code is current or historic. Check for related lamp codes.
  2. Step 2 — Visual: Inspect RH tail lamp assembly, lens, socket and wiring for moisture, corrosion, broken insulation, pinched wires and damaged harness routing.
  3. Step 3 — Bulb/module: Remove the bulb or LED module. Inspect for burnt contacts or melted plastic. Re-test circuit with the lamp removed to see if the short clears.
  4. Step 4 — Voltage test: With ignition and lights ON measure voltage at the lamp harness positive terminal. If near 0 V or fuse blown, suspect short to ground upstream.
  5. Step 5 — Continuity/ohms: With battery disconnected, measure resistance between the lamp positive terminal (harness side) and chassis ground. A low resistance (< a few ohms) indicates a short to ground.
  6. Step 6 — Isolate harness: Disconnect the RH rear lamp connector. If the short disappears when connector is unplugged, the short is in the lamp assembly or connector. If it remains, trace wiring toward front/BCM.
  7. Step 7 — Inspect route: Follow wiring from connector toward the body/BCM, inspecting high‑risk areas (doors, trunk hinge, rear quarter, grommets) for chafed insulation or exposed conductors.
  8. Step 8 — Repair: Repair or replace damaged wiring, clean/replace corroded connectors, replace faulty lamp or LED module, and restore proper ground connection. Use dielectric grease to prevent future corrosion.
  9. Step 9 — Verify BCM: If harness and lamp check good and short persists, test outputs at BCM per manufacturer procedures; consider BCM replacement only after wiring and lamps are ruled out.
  10. Step 10 — Clear codes and test: Clear DTCs, operate lights through cycles, and road test to confirm repair. Re-scan to ensure B2579 does not return.

Likely causes

  • Corroded/contaminated lamp connector allowing a short to chassis ground
  • Damaged wiring harness near rear quarter panel or lamp mounting area
  • Failed LED tail lamp module or internal short in incandescent lamp
  • Loose or missing ground strap/ground connection at lamp
  • Connector pushed into metal body or foreign object bridging terminals

Fault status

⚠️ Status
BCM reports short to ground on right rear tail lamp circuit (B2579). Circuit low resistance or overcurrent detected; lamp may not operate and related fuses or BCM outputs may be affected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours (depending on access and extent of wiring damage)

Similar codes

B2578 B257B B2577
371

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