What Does B2493 Mean?
This code indicates the Body Control Module (BCM) has detected a short to battery voltage in the left front park lamp output circuit. The BCM monitors the output circuit and has detected voltage present when the lamp should be off, or voltage higher than commanded. This typically means the circuit is receiving constant battery power from an unintended source, causing the lamp to potentially stay illuminated or draw current continuously.
Common Causes
40%
Damaged or chafed wiring harness causing wire insulation breakdown and contact with battery voltage source
30%
Failed or internally shorted park lamp socket or bulb assembly allowing backfeed of voltage
20%
Water intrusion or corrosion in lamp assembly or connector causing voltage leak or short circuit
10%
Failed Body Control Module output driver or internal BCM short circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of left front park lamp assembly, socket, bulb, and wiring harness for obvious damage, melting, corrosion, water intrusion, or chafed wires contacting metal surfaces
2
Step 2: Disconnect the left front park lamp connector at the lamp assembly. Using a digital multimeter, measure voltage at the BCM output wire terminal (vehicle side) with ignition on and park lamps commanded off - reading should be 0-0.5V. If battery voltage present, proceed to Step 3
3
Step 3: Disconnect the BCM connector controlling park lamp outputs. Measure resistance between the LF park lamp output circuit wire and battery positive - should read OL (infinite resistance). If continuity or low resistance detected, repair short in harness between BCM and lamp
4
Step 4: If no harness short found, inspect lamp socket and assembly for internal shorts or damage. Replace socket/assembly if defective. Reconnect all components, clear codes, and verify BCM can properly control lamp on/off without code returning
5
Step 5: If all circuits test normal, perform BCM output driver test by commanding lamp on/off with scan tool bi-directional controls while monitoring current draw - should be 0.3-0.8A when on, near 0A when off. Replace BCM if output driver shows continuous current flow or inability to switch
Estimated Repair Cost
$75 - $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 left front park lamp output circuit. The BCM monitors the output circuit and has detected voltage present when the lamp should be off, or voltage higher than commanded. This typically means the circuit i...
The most common cause of B2493 (LF PARK LAMP OUTPUT CIRCUIT Short to Battery) is: Damaged or chafed wiring harness causing wire insulation breakdown and contact with battery voltage source
Typical repair costs for B2493 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this affects only the park lamp function and does not impact primary headlight operation or vehicle safety systems. Repair soon to maintain proper lighting visibility and prevent potential battery drain from continuous current draw.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2493 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System
Difficulty
Type
Generic (SAE)
Recommended Tools
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