B2373: LED #1 Circuit Short to Battery

Definition

The OBD2 code B2373 indicates a short circuit in the LED #1 circuit, meaning that the circuit is receiving power directly from the battery instead of functioning normally

Common causes

Shorted wiring or connectors
Faulty LED or bulb
Corroded or damaged terminals
Malfunctioning control module
Grounding issues
Incorrectly installed aftermarket accessories
Water intrusion or moisture damage

Common misdiagnoses

Faulty LED light assembly
Wiring harness issues
Grounding problems
Faulty body control module (BCM)
Incorrectly installed or damaged connectors
Short circuits in adjacent circuits
Faulty fuses or relays
Software or programming errors in the vehicle's computer system

Troubleshooting steps

1. Verify the Code

Use an OBD-II scanner to confirm the presence of the B2373 code. Clear the code and see if it returns after a short drive
2. Inspect the Wiring and Connectors
3. Check the wiring harness associated with the LED circuit for any signs of damage, such as fraying, corrosion, or shorts
4. Inspect connectors for corrosion, bent pins, or loose connections
5. Check the LED Bulb
6. If applicable, remove the LED bulb and inspect it for damage. A shorted LED can cause this code
7. Replace the LED bulb if it appears to be faulty
8. Test the Circuit
9. Use a multimeter to check for continuity in the circuit. Ensure that there are no shorts to ground or battery voltage where there shouldn't be
10. Measure the voltage at the LED circuit to ensure it is within the expected range
11. Inspect Related Components
12. Check any related components, such as resistors or control modules, that may be part of the LED circuit
13. Ensure that any control modules are functioning correctly and are receiving the proper signals
14. Check for Ground Issues
15. Ensure that the ground connections for the LED circuit are secure and free of corrosion
16. A poor ground can cause erratic behavior and trigger fault codes
17. Review Vehicle Wiring Diagrams
18. Consult the vehicle’s wiring diagrams to understand the circuit layout and identify any potential issues in the wiring path
19. Perform a Visual Inspection
20. Look for any signs of previous repairs or modifications that may have affected the circuit
21. Check for any aftermarket accessories that may be drawing power from the same circuit
22. Consult Technical Service Bulletins (TSBs)
23. Check for any TSBs related to the B2373 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes
24. Seek Professional Help
25. If the issue persists after performing these steps, consider consulting a professional mechanic or automotive technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue causing the B2373 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Verify the Code

2. Inspect the Wiring and Connectors

3. Check the wiring harness associated with the LED circuit for any signs of damage, such as fraying, corrosion, or shorts

4. Inspect connectors for corrosion, bent pins, or loose connections

5. Check the LED Bulb

6. If applicable, remove the LED bulb and inspect it for damage. A shorted LED can cause this code

7. Replace the LED bulb if it appears to be faulty

8. Test the Circuit

9. Use a multimeter to check for continuity in the circuit. Ensure that there are no shorts to ground or battery voltage where there shouldn't be

10. Measure the voltage at the LED circuit to ensure it is within the expected range

11. Inspect Related Components

12. Check any related components, such as resistors or control modules, that may be part of the LED circuit

13. Ensure that any control modules are functioning correctly and are receiving the proper signals

14. Check for Ground Issues

15. Ensure that the ground connections for the LED circuit are secure and free of corrosion

16. A poor ground can cause erratic behavior and trigger fault codes

17. Review Vehicle Wiring Diagrams

18. Consult the vehicle’s wiring diagrams to understand the circuit layout and identify any potential issues in the wiring path

19. Perform a Visual Inspection

20. Look for any signs of previous repairs or modifications that may have affected the circuit

21. Check for any aftermarket accessories that may be drawing power from the same circuit

22. Consult Technical Service Bulletins (TSBs)

23. Check for any TSBs related to the B2373 code for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

24. Seek Professional Help

25. If the issue persists after performing these steps, consider consulting a professional mechanic or automotive technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue causing the B2373 code