B2487

RF SIDE REPEATER LAMP OUTPUT Ckt Short to Battery

Body Chassis/Safety Exterior lighting 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The right side repeater lamp circuit is shorted directly to the battery voltage, causing the lamp to stay on or malfunction. Think of it like a wire touching a power source where it shouldn't—the electricity takes the wrong path.

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Symptoms You May Notice

3 known symptoms for this code
Right front side repeater lamp stays on continuously or flickers
Dashboard warning light or body control module fault indicator illuminated
Potential electrical burning smell or melted wiring near lamp assembly
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The body control module monitors the RF (right front) repeater lamp output circuit voltage and expects it to switch between ground and a controlled supply. When the circuit shorts to battery voltage, the module detects sustained high voltage instead of the expected PWM or switched signal pattern, triggering a short-to-battery fault.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Lamp circuit voltage 0V (off) to 12-14V (on, controlled) Sustained 12-14V when lamp should be off or dimmed
Circuit resistance High impedance (open) or <5 ohms (on) <1 ohm direct to battery rail
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wiring harness connector at repeater lamp
Inspect and reseat the connector; clean corrosion and verify pins are not pushed back or bent.
2
Wiring harness (lamp circuit)
Trace the lamp wire from the body control module to the lamp for pinch damage, abrasion, or melting that exposes copper to ground or power.
3
Right front repeater lamp assembly
Replace the lamp unit if internal short is confirmed via ohm meter showing <1 ohm between power and ground inside the assembly.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B2487 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B2487

What happens after you fix the fault

Once the fault is repaired, B2487 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.