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Home / DTC / B2557 — Left Headlamp(Low Beam) Open

B2557 — Left Headlamp(Low Beam) Open

Detailed page for trouble code B2557.

34,405codes
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11,914generic
22,491specific
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Code

B2557

HYUNDAI B — Body

Left Headlamp(Low Beam) Open

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

Causes

  • Burned-out or open low-beam bulb (filament failure)
  • Open or damaged wiring between BCM/headlamp relay and left low-beam socket
  • Corroded, loose or disconnected headlamp connector or ground
  • Blown fuse or failed headlamp relay for the left low beam circuit
  • Faulty Body Control Module (BCM) or headlamp driver/module
  • Aftermarket modifications or poor prior repairs causing an open circuit

Symptoms

  • Left low-beam headlamp does not illuminate
  • Instrument cluster headlamp warning or indicator lamp may be on
  • Asymmetric lighting while driving at night (one low beam out)
  • Possible reduced visibility on left side
  • DTC B2557 stored in BCM or body control module

What to check

  • Visually inspect left headlamp assembly, bulb condition, and connector for corrosion/damage
  • Verify headlamp operation: switch ON low beams and confirm other lamps function
  • Check related fuses and relays for continuity and correct operation
  • Wiggle test the harness and connector while observing lamp or scan tool live data
  • Scan the BCM for stored codes and freeze-frame data; check for related body/module faults

Signal parameters

  • Expected battery voltage at lamp socket with low beams ON: ~11–14 V
  • Bulb filament resistance (halogen low-beam): typically ~1–6 ohms (cold); open = infinite
  • LED modules: measure supply voltage at module and expected current draw per service info (no simple filament resistance)
  • Ground continuity: close to 0 ohms from socket ground to chassis
  • BCM output/control signal: verify commanded ON state in scan tool (digital control or CAN status)

Diagnostic algorithm

  1. Use a scan tool to confirm B2557 is current or historic and view any related body/lighting codes.
  2. Turn ON low beams and visually confirm the left lamp is off while the right lamp is on.
  3. Inspect the left headlamp bulb and socket. Remove the bulb and inspect filament/LED and socket for corrosion or heat damage.
  4. Measure voltage at the bulb socket with low beams ON. If ~12 V present and bulb removed, check bulb resistance separately.
  5. If socket voltage is present and bulb is good, check continuity between socket ground and chassis; repair poor ground if found.
  6. If no voltage at socket, trace wiring back toward the BCM/relay: check fuses, relays, connector pin continuity, and wiring for opens or damage.
  7. If wiring and hardware appear intact, check BCM/headlamp driver outputs with a scan tool or oscilloscope per factory procedure; confirm BCM commands and driver response.
  8. Repair or replace the faulty component (bulb, wiring, connector, fuse/relay, or BCM/driver) as identified. Use manufacturer parts and routing/fastening practices.
  9. After repair, clear codes, cycle the headlights, and confirm lamp operation and that B2557 does not return.

Likely causes

  • Failed bulb or broken filament
  • Loose/disconnected connector at the left headlamp
  • Open/shorted wiring harness (pinched or chafed) to left low-beam
  • Corroded socket or poor ground connection

Fault status

⚠️ Status
Open circuit detected on left headlamp low-beam circuit — left low-beam lamp not drawing expected current or not illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2556 B2567 B2551 B2566
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

B2557

Other B — Body

Left Power Sliding Door Open/Close Output Circuit Short to Battery

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

Causes

  • Burned-out or open low-beam bulb (filament failure)
  • Open or damaged wiring between BCM/headlamp relay and left low-beam socket
  • Corroded, loose or disconnected headlamp connector or ground
  • Blown fuse or failed headlamp relay for the left low beam circuit
  • Faulty Body Control Module (BCM) or headlamp driver/module
  • Aftermarket modifications or poor prior repairs causing an open circuit

Symptoms

  • Left low-beam headlamp does not illuminate
  • Instrument cluster headlamp warning or indicator lamp may be on
  • Asymmetric lighting while driving at night (one low beam out)
  • Possible reduced visibility on left side
  • DTC B2557 stored in BCM or body control module

What to check

  • Visually inspect left headlamp assembly, bulb condition, and connector for corrosion/damage
  • Verify headlamp operation: switch ON low beams and confirm other lamps function
  • Check related fuses and relays for continuity and correct operation
  • Wiggle test the harness and connector while observing lamp or scan tool live data
  • Scan the BCM for stored codes and freeze-frame data; check for related body/module faults

Signal parameters

  • Expected battery voltage at lamp socket with low beams ON: ~11–14 V
  • Bulb filament resistance (halogen low-beam): typically ~1–6 ohms (cold); open = infinite
  • LED modules: measure supply voltage at module and expected current draw per service info (no simple filament resistance)
  • Ground continuity: close to 0 ohms from socket ground to chassis
  • BCM output/control signal: verify commanded ON state in scan tool (digital control or CAN status)

Diagnostic algorithm

  1. Use a scan tool to confirm B2557 is current or historic and view any related body/lighting codes.
  2. Turn ON low beams and visually confirm the left lamp is off while the right lamp is on.
  3. Inspect the left headlamp bulb and socket. Remove the bulb and inspect filament/LED and socket for corrosion or heat damage.
  4. Measure voltage at the bulb socket with low beams ON. If ~12 V present and bulb removed, check bulb resistance separately.
  5. If socket voltage is present and bulb is good, check continuity between socket ground and chassis; repair poor ground if found.
  6. If no voltage at socket, trace wiring back toward the BCM/relay: check fuses, relays, connector pin continuity, and wiring for opens or damage.
  7. If wiring and hardware appear intact, check BCM/headlamp driver outputs with a scan tool or oscilloscope per factory procedure; confirm BCM commands and driver response.
  8. Repair or replace the faulty component (bulb, wiring, connector, fuse/relay, or BCM/driver) as identified. Use manufacturer parts and routing/fastening practices.
  9. After repair, clear codes, cycle the headlights, and confirm lamp operation and that B2557 does not return.

Likely causes

  • Failed bulb or broken filament
  • Loose/disconnected connector at the left headlamp
  • Open/shorted wiring harness (pinched or chafed) to left low-beam
  • Corroded socket or poor ground connection

Fault status

⚠️ Status
Open circuit detected on left headlamp low-beam circuit — left low-beam lamp not drawing expected current or not illuminated.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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B2556 B2567 B2551 B2566
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