Code
B2559
HYUNDAI
B — Body
Right Front Fog Lamp Short to Ground
AI status
Completed
Completed
100%
Causes
- Damaged or pinched wiring harness (insulation chafed, wire contacting chassis)
- Corroded or water-intruded fog lamp connector or bulb socket
- Shorted bulb (filament contacting housing) or melted socket
- Aftermarket fog lamp harness or accessory miswired to ground
- Damaged or shorted BCM/lighting module output transistor
- Loose, bent or pushed-out connector terminal making contact with ground
Symptoms
- Right front fog lamp does not turn on
- Fuses for fog lamps may blow repeatedly
- Dash indicator or warning lamp for lighting/BCM fault present
- DTC B2559 stored in BCM or body control module
- Intermittent lamp operation (works sometimes when connector moved)
What to check
- Read and record codes with an OBD/scan tool; note freeze frame or lamp on/off state
- Visual inspection of right front fog lamp, bulb, socket, harness routing through bumper/engine bay and connector for damage, corrosion or water ingress
- Check fog lamp fuse(s) and related relay for blown fuse or signs of overheating
- Remove the fog lamp bulb and visually inspect socket and bulb for signs of shorting or melted plastic
- With ignition off, disconnect the fog lamp connector and inspect terminals for corrosion, bent pins or foreign material
- Measure continuity between the lamp circuit supply and chassis ground with connector disconnected (should NOT be a direct short)
Signal parameters
- Battery voltage at fog lamp power supply fuse/relay: ~12–14 V (key ON, lights ON)
- Right front fog lamp connector supply pin: ~12 V with power applied (if supply-side switched)
- Right front fog lamp connector control pin (if low-side switched by BCM): should be high-impedance when OFF and switch toward ground or PWM when ON (consult vehicle wiring diagram)
- Resistance of a good fog lamp bulb: low ohms (typical halogen lamp filament ~1–5 Ω depending on wattage) — a near 0 Ω reading between supply and chassis indicates a short
- Open circuit (infinite) between lamp harness power pin and chassis ground with lamp disconnected and no short present
Diagnostic algorithm
- Safety first: park on level ground, key OFF, wear eye protection, and disconnect battery if performing resistance checks that could short circuits.
- Read and record DTC(s) with a scan tool. Clear code, then attempt to activate fog lamps and see if code returns to confirm reproducibility.
- Visual inspection: examine right fog lamp bulb, socket and harness for melted plastic, corrosion, pinched wires, or areas where the harness rubs on metal. Inspect behind the bumper and in wheelwell where wiring routes.
- Fuse/relay check: verify fog lamp fuse is correct rating and not blown; inspect relay contacts for damage. Replace fuse/relay if suspect, but do not repeatedly replace fuse without diagnosing short.
- Connector inspection: disconnect right fog lamp connector. Look for corrosion, bent pins, or terminal protrusion that could contact metal. Clean or replace connector as needed.
- Bulb isolation: remove the bulb and test resistance across bulb terminals to verify not internally shorted. Re-test circuit with bulb removed: measure continuity between the harness power pin and chassis ground. If there is continuity (near 0 Ω), the short is in the harness or downstream of disconnect point.
- Harness isolation: if short exists with connector disconnected, follow the harness toward the front of the vehicle in sections, disconnecting other connectors or grounding points to isolate the short location. Repair or replace damaged wiring/terminals.
- Voltage checks: with the harness connector disconnected and using a fused test lead, check for battery voltage at the power feed and correct behavior at the control/ground side when the fog lights are commanded ON/OFF. Use a current-limited source or fused test light to avoid damage.
- BCM output check: if harness and bulb are OK and no external short is found, verify BCM lighting output using manufacturer diagnostic procedures — a failed BCM output transistor can present as a short to ground. Replace module only after isolating fault to module.
- Repair and protect: repair wiring with proper solder/heat-shrink or OEM-quality connectors, replace damaged sockets or bulbs, re-route harness away from pinch points, and apply dielectric grease to connectors to prevent moisture.
- Clear codes and test: after repair, clear DTCs, operate fog lamps multiple cycles and road test to confirm the fault does not return.
Likely causes
- Wiring insulation abrasion where harness passes through body or bumper contacting metal
- Corrosion/moisture in the lamp connector allowing pins to short to housing
- Aftermarket lamp or repair harness improperly routed or grounded
- Failed fog lamp bulb or socket causing internal short
- BCM output failed and is shorting to ground (less common)
Fault status
Status
Right front fog lamp circuit short to ground detected. The BCM/lighting control has detected an unexpected ground (overcurrent) on the right front fog lamp circuit; the lamp may not operate and related fuses may blow.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Manual library for HYUNDAI
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Code
B2559
Other
B — Body
Aux A/C Blower Motor Relay Circuit Short to Battery
AI status
Completed
Completed
100%
Causes
- Damaged or pinched wiring harness (insulation chafed, wire contacting chassis)
- Corroded or water-intruded fog lamp connector or bulb socket
- Shorted bulb (filament contacting housing) or melted socket
- Aftermarket fog lamp harness or accessory miswired to ground
- Damaged or shorted BCM/lighting module output transistor
- Loose, bent or pushed-out connector terminal making contact with ground
Symptoms
- Right front fog lamp does not turn on
- Fuses for fog lamps may blow repeatedly
- Dash indicator or warning lamp for lighting/BCM fault present
- DTC B2559 stored in BCM or body control module
- Intermittent lamp operation (works sometimes when connector moved)
What to check
- Read and record codes with an OBD/scan tool; note freeze frame or lamp on/off state
- Visual inspection of right front fog lamp, bulb, socket, harness routing through bumper/engine bay and connector for damage, corrosion or water ingress
- Check fog lamp fuse(s) and related relay for blown fuse or signs of overheating
- Remove the fog lamp bulb and visually inspect socket and bulb for signs of shorting or melted plastic
- With ignition off, disconnect the fog lamp connector and inspect terminals for corrosion, bent pins or foreign material
- Measure continuity between the lamp circuit supply and chassis ground with connector disconnected (should NOT be a direct short)
Signal parameters
- Battery voltage at fog lamp power supply fuse/relay: ~12–14 V (key ON, lights ON)
- Right front fog lamp connector supply pin: ~12 V with power applied (if supply-side switched)
- Right front fog lamp connector control pin (if low-side switched by BCM): should be high-impedance when OFF and switch toward ground or PWM when ON (consult vehicle wiring diagram)
- Resistance of a good fog lamp bulb: low ohms (typical halogen lamp filament ~1–5 Ω depending on wattage) — a near 0 Ω reading between supply and chassis indicates a short
- Open circuit (infinite) between lamp harness power pin and chassis ground with lamp disconnected and no short present
Diagnostic algorithm
- Safety first: park on level ground, key OFF, wear eye protection, and disconnect battery if performing resistance checks that could short circuits.
- Read and record DTC(s) with a scan tool. Clear code, then attempt to activate fog lamps and see if code returns to confirm reproducibility.
- Visual inspection: examine right fog lamp bulb, socket and harness for melted plastic, corrosion, pinched wires, or areas where the harness rubs on metal. Inspect behind the bumper and in wheelwell where wiring routes.
- Fuse/relay check: verify fog lamp fuse is correct rating and not blown; inspect relay contacts for damage. Replace fuse/relay if suspect, but do not repeatedly replace fuse without diagnosing short.
- Connector inspection: disconnect right fog lamp connector. Look for corrosion, bent pins, or terminal protrusion that could contact metal. Clean or replace connector as needed.
- Bulb isolation: remove the bulb and test resistance across bulb terminals to verify not internally shorted. Re-test circuit with bulb removed: measure continuity between the harness power pin and chassis ground. If there is continuity (near 0 Ω), the short is in the harness or downstream of disconnect point.
- Harness isolation: if short exists with connector disconnected, follow the harness toward the front of the vehicle in sections, disconnecting other connectors or grounding points to isolate the short location. Repair or replace damaged wiring/terminals.
- Voltage checks: with the harness connector disconnected and using a fused test lead, check for battery voltage at the power feed and correct behavior at the control/ground side when the fog lights are commanded ON/OFF. Use a current-limited source or fused test light to avoid damage.
- BCM output check: if harness and bulb are OK and no external short is found, verify BCM lighting output using manufacturer diagnostic procedures — a failed BCM output transistor can present as a short to ground. Replace module only after isolating fault to module.
- Repair and protect: repair wiring with proper solder/heat-shrink or OEM-quality connectors, replace damaged sockets or bulbs, re-route harness away from pinch points, and apply dielectric grease to connectors to prevent moisture.
- Clear codes and test: after repair, clear DTCs, operate fog lamps multiple cycles and road test to confirm the fault does not return.
Likely causes
- Wiring insulation abrasion where harness passes through body or bumper contacting metal
- Corrosion/moisture in the lamp connector allowing pins to short to housing
- Aftermarket lamp or repair harness improperly routed or grounded
- Failed fog lamp bulb or socket causing internal short
- BCM output failed and is shorting to ground (less common)
Fault status
Status
Right front fog lamp circuit short to ground detected. The BCM/lighting control has detected an unexpected ground (overcurrent) on the right front fog lamp circuit; the lamp may not operate and related fuses may blow.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
Repair manuals
Brands with available manuals
9,389
The library contains 9,389 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
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Was this AI description helpful?
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0
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