B1506

Lamp Turn Signal Right Circuit Short To Ground

Body Chassis/Safety Turn Signal Circuit 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

Your right turn signal lamp circuit is shorted to ground, meaning electricity is taking an unintended path and causing the lamp to malfunction. It's like a water pipe with a hole in it—the current is leaking out where it shouldn't be.

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Symptoms You May Notice

3 known symptoms for this code
Right turn signal lamp not illuminating or very dim
Right turn signal not blinking or blinking erratically
Dashboard turn signal indicator not functioning on right side
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The body control module monitors the voltage and current draw on the right turn signal lamp circuit. It expects a specific resistance and voltage when the turn signal is activated. When it detects an abnormally low resistance or excessive current draw indicating a direct short to ground, it sets this fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Circuit Resistance 4-8 ohms (lamp filament) < 1 ohm (short to ground)
Circuit Voltage 10-14V when activated 0V or ground reference detected
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Turn signal bulb
Replace the right front and/or rear turn signal bulb as it may be damaged or have a failed base causing the short.
2
Wiring harness section
Inspect the wiring from the body control module to the turn signal lamp for cuts, abrasion, or damaged insulation and repair or replace damaged sections.
3
Turn signal relay or body control module
If wiring and bulbs are good, the turn signal relay or body control module may be faulty and require replacement.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1506 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 B1506

What happens after you fix the fault

Once the fault is repaired, B1506 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.