B2493: Left Park Lamp Short to Battery
The B2493 code indicates that the Body Control Module (BCM) has detected an abnormally high voltage on the left front park lamp output circuit. This typically occurs when the circuit is shorted to battery voltage, meaning the park lamp is commanded off but the BCM sees battery voltage on the output line, or the circuit has an unintended connection to a constant 12V source. The BCM monitors the voltage feedback from the park lamp circuit; if the voltage exceeds the maximum threshold when the lamp should be off or drawing normal current, the code is set.
1. Commonly Affected Makes
2. Most Common Causes
- Short to battery voltage in the left front park lamp wiring harness
- Pinched or chafed wiring making contact with a battery-positive circuit
- Faulty BCM with a shorted output driver
- Moisture or corrosion in the left headlamp connector causing an arc or short
3. Symptoms You Will Notice
- Left front park lamp stays on continuously or flickers
- Left front park lamp does not turn off when commanded
- Blown fuse for the park lamp circuit
- BCM may disable the output to prevent damage
4. Step-by-Step Diagnosis
Inspect the left front park lamp bulb and socket for damage or corrosion
Check the wiring harness for signs of chafing, pinching, or contact with metal or other circuits
Disconnect the left front park lamp connector and measure voltage at the BCM output wire with the lamp commanded off; if voltage is present, trace the short to battery
Test the BCM output driver by commanding the lamp on and off while monitoring voltage; if the driver fails to switch, replace the BCM
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the left park lamp may not function correctly, reducing visibility at night. The short could also cause a blown fuse or BCM damage. It is recommended to repair promptly.
How much does it cost to fix?▼
Typically $100 to $300, depending on the cause. A simple wiring repair may cost $100-$150, while BCM replacement can range from $200 to $500 including labor.