What Does B2487 Mean?
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the right front (RF) side repeater lamp circuit. The side repeater lamp, typically located in the side mirror or front fender, is receiving constant voltage when it should be controlled by the BCM. This condition prevents proper lamp operation and can cause continuous illumination or module damage.
Common Causes
45%
Damaged wiring harness with insulation worn through, causing wire to contact battery voltage at connector, door hinge area, or mirror housing
30%
Failed side repeater lamp assembly with internal short circuit creating path to battery voltage
15%
Corroded or damaged connector terminals at lamp or BCM creating cross-circuit short to adjacent power wire
10%
Faulty Body Control Module with internal driver circuit failure causing misdiagnosis of short condition
Diagnostic Steps
1
Step 1: Perform visual inspection of RF side repeater lamp assembly and wiring, checking for obvious damage, melted connectors, or pinched wires at door hinge and mirror mounting points
2
Step 2: Disconnect RF side repeater lamp connector and measure voltage at lamp-side harness connector with ignition on - should read 0V; if battery voltage present, wiring harness has short to power
3
Step 3: With lamp disconnected, use multimeter to measure resistance between lamp output circuit pin at BCM connector and battery positive - should read infinite resistance (OL); low resistance confirms short in harness
4
Step 4: If no voltage found at lamp connector, reconnect lamp and measure current draw - excessive current (over 0.5A typically) indicates failed lamp assembly with internal short
5
Step 5: Isolate short location by disconnecting intermediate connectors along harness route while monitoring resistance, focusing on flexible areas at door hinge and mirror pivot points
6
Step 6: After repair, clear codes and verify lamp operates correctly through BCM commanded test functions, confirming no battery voltage present when lamp commanded off
Estimated Repair Cost
$100 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the right front (RF) side repeater lamp circuit. The side repeater lamp, typically located in the side mirror or front fender, is receiving constant voltage when it should be controlled by the BCM. This cond...
The most common cause of B2487 (RF SIDE REPEATER LAMP OUTPUT Ckt Short to Battery) is: Damaged wiring harness with insulation worn through, causing wire to contact battery voltage at connector, door hinge area, or mirror housing
Typical repair costs for B2487 range from $100 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive as this affects only the side turn signal repeater indicator lamp. The main turn signals likely still function, but other drivers may have reduced visibility of turn intentions from side angles, particularly in heavy traffic or when changing lanes.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2487 to identify the root cause.
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Quick Info
Category
Body
System
Body Electrical System / Exterior Lighting
Difficulty
Type
Generic (SAE)
Recommended Tools
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