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Home / DTC / B2472 — Low Beam Fault

B2472 — Low Beam Fault

Detailed page for trouble code B2472.

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59brands
11,699generic
22,491specific
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Code

B2472

HUMMER B — Body

Low Beam Fault

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

Causes

  • Burned or failed low-beam bulb (halogen, HID ballast, or LED module)
  • Blown fuse or faulty headlamp relay
  • Poor/ corroded connector or socket at the lamp
  • Damaged wiring (open, short to ground or power, chafe)
  • Faulty headlamp driver, ballast or LED driver module
  • Body Control Module (BCM) or headlamp control module fault

Symptoms

  • One or both low-beam headlights inoperative
  • Headlamps flicker or work intermittently
  • Instrument cluster warning or message for headlamp
  • Reduced nighttime illumination or asymmetric beam
  • Other modules report related communication faults (occasional)

What to check

  • Use a scan tool to read B2472 and any related freeze-frame or module data
  • Visually inspect bulbs, sockets and headlamp lenses for damage or moisture
  • Check fuses and relays for the headlamp circuits
  • Inspect connectors for corrosion, bent pins, or poor contact
  • Measure voltage and ground at the headlamp connector with lamp commanded ON
  • Perform wiggle test on wiring and connectors while watching live data/lamps

Signal parameters

  • Battery supply at lamp connector (engine off/on): ~12.0–14.5 V
  • Typical halogen low-beam current: ~3–6 A (55 W class) — expect ~3–5 A at 13.5 V
  • Typical halogen filament resistance (hot): ~2–5 Ω (varies by bulb type)
  • LED driver input current: can be ~0.5–5 A depending on module (check OEM spec)
  • Ground resistance to chassis:
  • If PWM dimming used: control signal frequencies commonly 100–1000 Hz (module-specific)

Diagnostic algorithm

  1. Safety: park, key OFF, wear eye protection for bulb handling. Use a scan tool with module access.
  2. Capture data: record freeze-frame and related codes. Note which side (LH/RH) is affected if indicated.
  3. Visual: inspect lamp assembly for burned bulb, water ingress, or connector damage. Replace visibly damaged components.
  4. Bulb check: remove and visually inspect filament (halogen) or test replacement with a known-good bulb or swap left/right to see if fault follows bulb.
  5. Fuses/relays: verify headlamp fuses and relays. Replace suspect items and retest.
  6. Measure supply: command low beams ON with scan tool; measure voltage at the lamp power pin and ground. Expect battery voltage. If no voltage, trace back to relay/BCM.
  7. Ground and continuity: check continuity from lamp ground to chassis ground (
  8. Wiring inspection: inspect harness for chafe or pinched areas, especially near hinges, bumper, or lamp mount. Repair shorts/opens.
  9. Module output: if voltage present at relay but not at lamp, test BCM/headlamp driver output. Check for PWM or switched output using scope if available.
  10. Communications: verify module communications (CAN/serial) with scan tool; address U-codes that may indicate lost comms to BCM or headlamp module.
  11. Component substitution: if wiring, fuses and bulbs are good and BCM/driver output is abnormal, replace or reprogram the headlamp driver or BCM per OEM procedure.
  12. Clear codes and road-test: after repairs, clear codes, operate headlamps through all modes, and verify B2472 does not return.

Likely causes

  • Failed low-beam bulb or poor bulb contact
  • Corroded/loose lamp connector or ground
  • Blown fuse or faulty relay for headlamps
  • Wiring damage at harness near lamp or hinge areas
  • Faulty headlamp driver module (if vehicle uses HID/LED)

Fault status

⚠️ Status
Body module reports LOW BEAM FAULT — circuit open/short/overload or headlamp driver/communication fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B2470 B2471 B2473 B2580 U0155 U0100
Repair manuals

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138

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Code

B2472

LAND ROVER B — Body

Failure in the fog lamp switch

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

Causes

  • Burned or failed low-beam bulb (halogen, HID ballast, or LED module)
  • Blown fuse or faulty headlamp relay
  • Poor/ corroded connector or socket at the lamp
  • Damaged wiring (open, short to ground or power, chafe)
  • Faulty headlamp driver, ballast or LED driver module
  • Body Control Module (BCM) or headlamp control module fault

Symptoms

  • One or both low-beam headlights inoperative
  • Headlamps flicker or work intermittently
  • Instrument cluster warning or message for headlamp
  • Reduced nighttime illumination or asymmetric beam
  • Other modules report related communication faults (occasional)

What to check

  • Use a scan tool to read B2472 and any related freeze-frame or module data
  • Visually inspect bulbs, sockets and headlamp lenses for damage or moisture
  • Check fuses and relays for the headlamp circuits
  • Inspect connectors for corrosion, bent pins, or poor contact
  • Measure voltage and ground at the headlamp connector with lamp commanded ON
  • Perform wiggle test on wiring and connectors while watching live data/lamps

Signal parameters

  • Battery supply at lamp connector (engine off/on): ~12.0–14.5 V
  • Typical halogen low-beam current: ~3–6 A (55 W class) — expect ~3–5 A at 13.5 V
  • Typical halogen filament resistance (hot): ~2–5 Ω (varies by bulb type)
  • LED driver input current: can be ~0.5–5 A depending on module (check OEM spec)
  • Ground resistance to chassis:
  • If PWM dimming used: control signal frequencies commonly 100–1000 Hz (module-specific)

Diagnostic algorithm

  1. Safety: park, key OFF, wear eye protection for bulb handling. Use a scan tool with module access.
  2. Capture data: record freeze-frame and related codes. Note which side (LH/RH) is affected if indicated.
  3. Visual: inspect lamp assembly for burned bulb, water ingress, or connector damage. Replace visibly damaged components.
  4. Bulb check: remove and visually inspect filament (halogen) or test replacement with a known-good bulb or swap left/right to see if fault follows bulb.
  5. Fuses/relays: verify headlamp fuses and relays. Replace suspect items and retest.
  6. Measure supply: command low beams ON with scan tool; measure voltage at the lamp power pin and ground. Expect battery voltage. If no voltage, trace back to relay/BCM.
  7. Ground and continuity: check continuity from lamp ground to chassis ground (
  8. Wiring inspection: inspect harness for chafe or pinched areas, especially near hinges, bumper, or lamp mount. Repair shorts/opens.
  9. Module output: if voltage present at relay but not at lamp, test BCM/headlamp driver output. Check for PWM or switched output using scope if available.
  10. Communications: verify module communications (CAN/serial) with scan tool; address U-codes that may indicate lost comms to BCM or headlamp module.
  11. Component substitution: if wiring, fuses and bulbs are good and BCM/driver output is abnormal, replace or reprogram the headlamp driver or BCM per OEM procedure.
  12. Clear codes and road-test: after repairs, clear codes, operate headlamps through all modes, and verify B2472 does not return.

Likely causes

  • Failed low-beam bulb or poor bulb contact
  • Corroded/loose lamp connector or ground
  • Blown fuse or faulty relay for headlamps
  • Wiring damage at harness near lamp or hinge areas
  • Faulty headlamp driver module (if vehicle uses HID/LED)

Fault status

⚠️ Status
Body module reports LOW BEAM FAULT — circuit open/short/overload or headlamp driver/communication fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B2470 B2471 B2473 B2580 U0155 U0100
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B2472

MITSUBISHI B — Body

Off hook button stuck

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

Causes

  • Burned or failed low-beam bulb (halogen, HID ballast, or LED module)
  • Blown fuse or faulty headlamp relay
  • Poor/ corroded connector or socket at the lamp
  • Damaged wiring (open, short to ground or power, chafe)
  • Faulty headlamp driver, ballast or LED driver module
  • Body Control Module (BCM) or headlamp control module fault

Symptoms

  • One or both low-beam headlights inoperative
  • Headlamps flicker or work intermittently
  • Instrument cluster warning or message for headlamp
  • Reduced nighttime illumination or asymmetric beam
  • Other modules report related communication faults (occasional)

What to check

  • Use a scan tool to read B2472 and any related freeze-frame or module data
  • Visually inspect bulbs, sockets and headlamp lenses for damage or moisture
  • Check fuses and relays for the headlamp circuits
  • Inspect connectors for corrosion, bent pins, or poor contact
  • Measure voltage and ground at the headlamp connector with lamp commanded ON
  • Perform wiggle test on wiring and connectors while watching live data/lamps

Signal parameters

  • Battery supply at lamp connector (engine off/on): ~12.0–14.5 V
  • Typical halogen low-beam current: ~3–6 A (55 W class) — expect ~3–5 A at 13.5 V
  • Typical halogen filament resistance (hot): ~2–5 Ω (varies by bulb type)
  • LED driver input current: can be ~0.5–5 A depending on module (check OEM spec)
  • Ground resistance to chassis:
  • If PWM dimming used: control signal frequencies commonly 100–1000 Hz (module-specific)

Diagnostic algorithm

  1. Safety: park, key OFF, wear eye protection for bulb handling. Use a scan tool with module access.
  2. Capture data: record freeze-frame and related codes. Note which side (LH/RH) is affected if indicated.
  3. Visual: inspect lamp assembly for burned bulb, water ingress, or connector damage. Replace visibly damaged components.
  4. Bulb check: remove and visually inspect filament (halogen) or test replacement with a known-good bulb or swap left/right to see if fault follows bulb.
  5. Fuses/relays: verify headlamp fuses and relays. Replace suspect items and retest.
  6. Measure supply: command low beams ON with scan tool; measure voltage at the lamp power pin and ground. Expect battery voltage. If no voltage, trace back to relay/BCM.
  7. Ground and continuity: check continuity from lamp ground to chassis ground (
  8. Wiring inspection: inspect harness for chafe or pinched areas, especially near hinges, bumper, or lamp mount. Repair shorts/opens.
  9. Module output: if voltage present at relay but not at lamp, test BCM/headlamp driver output. Check for PWM or switched output using scope if available.
  10. Communications: verify module communications (CAN/serial) with scan tool; address U-codes that may indicate lost comms to BCM or headlamp module.
  11. Component substitution: if wiring, fuses and bulbs are good and BCM/driver output is abnormal, replace or reprogram the headlamp driver or BCM per OEM procedure.
  12. Clear codes and road-test: after repairs, clear codes, operate headlamps through all modes, and verify B2472 does not return.

Likely causes

  • Failed low-beam bulb or poor bulb contact
  • Corroded/loose lamp connector or ground
  • Blown fuse or faulty relay for headlamps
  • Wiring damage at harness near lamp or hinge areas
  • Faulty headlamp driver module (if vehicle uses HID/LED)

Fault status

⚠️ Status
Body module reports LOW BEAM FAULT — circuit open/short/overload or headlamp driver/communication fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

Similar codes

B2470 B2471 B2473 B2580 U0155 U0100
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

B2472

Other B — Body

Fog Lamp Switch Failure

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

Causes

  • Burned or failed low-beam bulb (halogen, HID ballast, or LED module)
  • Blown fuse or faulty headlamp relay
  • Poor/ corroded connector or socket at the lamp
  • Damaged wiring (open, short to ground or power, chafe)
  • Faulty headlamp driver, ballast or LED driver module
  • Body Control Module (BCM) or headlamp control module fault

Symptoms

  • One or both low-beam headlights inoperative
  • Headlamps flicker or work intermittently
  • Instrument cluster warning or message for headlamp
  • Reduced nighttime illumination or asymmetric beam
  • Other modules report related communication faults (occasional)

What to check

  • Use a scan tool to read B2472 and any related freeze-frame or module data
  • Visually inspect bulbs, sockets and headlamp lenses for damage or moisture
  • Check fuses and relays for the headlamp circuits
  • Inspect connectors for corrosion, bent pins, or poor contact
  • Measure voltage and ground at the headlamp connector with lamp commanded ON
  • Perform wiggle test on wiring and connectors while watching live data/lamps

Signal parameters

  • Battery supply at lamp connector (engine off/on): ~12.0–14.5 V
  • Typical halogen low-beam current: ~3–6 A (55 W class) — expect ~3–5 A at 13.5 V
  • Typical halogen filament resistance (hot): ~2–5 Ω (varies by bulb type)
  • LED driver input current: can be ~0.5–5 A depending on module (check OEM spec)
  • Ground resistance to chassis:
  • If PWM dimming used: control signal frequencies commonly 100–1000 Hz (module-specific)

Diagnostic algorithm

  1. Safety: park, key OFF, wear eye protection for bulb handling. Use a scan tool with module access.
  2. Capture data: record freeze-frame and related codes. Note which side (LH/RH) is affected if indicated.
  3. Visual: inspect lamp assembly for burned bulb, water ingress, or connector damage. Replace visibly damaged components.
  4. Bulb check: remove and visually inspect filament (halogen) or test replacement with a known-good bulb or swap left/right to see if fault follows bulb.
  5. Fuses/relays: verify headlamp fuses and relays. Replace suspect items and retest.
  6. Measure supply: command low beams ON with scan tool; measure voltage at the lamp power pin and ground. Expect battery voltage. If no voltage, trace back to relay/BCM.
  7. Ground and continuity: check continuity from lamp ground to chassis ground (
  8. Wiring inspection: inspect harness for chafe or pinched areas, especially near hinges, bumper, or lamp mount. Repair shorts/opens.
  9. Module output: if voltage present at relay but not at lamp, test BCM/headlamp driver output. Check for PWM or switched output using scope if available.
  10. Communications: verify module communications (CAN/serial) with scan tool; address U-codes that may indicate lost comms to BCM or headlamp module.
  11. Component substitution: if wiring, fuses and bulbs are good and BCM/driver output is abnormal, replace or reprogram the headlamp driver or BCM per OEM procedure.
  12. Clear codes and road-test: after repairs, clear codes, operate headlamps through all modes, and verify B2472 does not return.

Likely causes

  • Failed low-beam bulb or poor bulb contact
  • Corroded/loose lamp connector or ground
  • Blown fuse or faulty relay for headlamps
  • Wiring damage at harness near lamp or hinge areas
  • Faulty headlamp driver module (if vehicle uses HID/LED)

Fault status

⚠️ Status
Body module reports LOW BEAM FAULT — circuit open/short/overload or headlamp driver/communication fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2 hours

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B2470 B2471 B2473 B2580 U0155 U0100
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