What Does B2373 Mean?
This code indicates that the Body Control Module (BCM) has detected an abnormal voltage condition on the LED #1 circuit, specifically a short to battery voltage. The control module expected to see a controlled voltage or ground signal but instead detected continuous battery voltage (typically 12-14 volts) on the circuit. This suggests that the positive side of the LED circuit is making unintended contact with a power source, preventing proper LED operation and potentially causing component damage.
Common Causes
45%
Damaged or chafed wiring harness causing the LED circuit wire to contact a power wire or battery positive terminal
30%
Failed LED assembly with internal short circuit to power supply within the LED module
15%
Corroded or damaged connector terminals creating cross-circuit short between power and signal wires
10%
Body Control Module internal circuit failure causing improper voltage output to LED circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the LED #1 assembly and all associated wiring, looking for obvious damage, melted insulation, pinched wires near body panels, or signs of water intrusion at connectors
2
Step 2: Disconnect the LED #1 connector at the component and measure voltage on the vehicle harness side signal wire with ignition on using a digital multimeter - you should see 0 volts or controlled voltage pulses, not continuous battery voltage
3
Step 3: If battery voltage is present at the harness with LED disconnected, disconnect the BCM connector and recheck voltage - if voltage disappears, BCM is faulty; if voltage remains, trace the wire for a short to power along its routing path
4
Step 4: If no voltage is present at the harness with LED disconnected, measure resistance of the LED assembly across its power and ground pins - a very low resistance (under 1 ohm) indicates internal LED short circuit
5
Step 5: Inspect all connector terminals for corrosion, bent pins, or signs of moisture using a flashlight and magnification, clean or repair as needed, and apply dielectric grease
6
Step 6: After repairs, clear the code, cycle the ignition, operate the LED through its normal functions, and verify the code does not return while monitoring live data for proper circuit operation
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected an abnormal voltage condition on the LED #1 circuit, specifically a short to battery voltage. The control module expected to see a controlled voltage or ground signal but instead detected continuous battery voltage (typically 12-14 ...
The most common cause of B2373 (LED #1 Circuit Short to Battery) is: Damaged or chafed wiring harness causing the LED circuit wire to contact a power wire or battery positive terminal
Typical repair costs for B2373 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to continue driving as this typically affects non-critical indicator or accent lighting. However, if the affected LED is part of required safety lighting (brake lights, turn signals, headlights), repair should be prioritized to maintain visibility and legal compliance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2373 to identify the root cause.
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Quick Info
Category
Body
System
Body Control System / Lighting
Difficulty
Type
Generic (SAE)
Recommended Tools
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