C1920: Led #1 Circuit Failure

Definition

The OBD2 code C1920 indicates a failure in the circuit for LED #1, typically related to a malfunction in the lighting system or a specific LED component in the vehicle

Common causes

Faulty LED #1
Damaged wiring or connectors
Short circuit in the circuit
Open circuit in the circuit
Poor ground connection
Failed control module
Corrosion in connectors or terminals
Incorrect installation or replacement of LED components

Common misdiagnoses

Faulty LED module
Wiring issues
Connector problems
Faulty control module
Grounding issues
Short circuits in the circuit
Open circuits in the circuit
Incorrectly installed components

Troubleshooting steps

1. Check the Vehicle's Manual

Refer to the vehicle's service manual for specific information related to the C1920 code, including wiring diagrams and component locations
2. Visual Inspection
3. Inspect the wiring and connectors associated with the LED #1 circuit for any signs of damage, corrosion, or loose connections
4. Look for any frayed wires or broken connectors that could cause a poor electrical connection
5. Check the LED
6. If applicable, test the LED itself to ensure it is functioning properly. Replace it if it is burned out or damaged
7. Test the Circuit
8. Use a multimeter to check for continuity in the LED #1 circuit. Ensure that there are no breaks in the wiring
9. Measure the voltage at the LED connection to ensure it is receiving the correct voltage
10. Inspect Related Components
11. Check other components in the circuit that may affect the LED operation, such as relays, fuses, or control modules
12. Ensure that the ABS module or traction control module is functioning correctly, as these systems often control the LED indicators
13. Clear the Code
14. After performing any repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
15. Scan for Additional Codes
16. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues
17. Consult a Professional
18. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and resolve the issue related to the C1920 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Vehicle's Manual

2. Visual Inspection

3. Inspect the wiring and connectors associated with the LED #1 circuit for any signs of damage, corrosion, or loose connections

4. Look for any frayed wires or broken connectors that could cause a poor electrical connection

5. Check the LED

6. If applicable, test the LED itself to ensure it is functioning properly. Replace it if it is burned out or damaged

7. Test the Circuit

8. Use a multimeter to check for continuity in the LED #1 circuit. Ensure that there are no breaks in the wiring

9. Measure the voltage at the LED connection to ensure it is receiving the correct voltage

10. Inspect Related Components

11. Check other components in the circuit that may affect the LED operation, such as relays, fuses, or control modules

12. Ensure that the ABS module or traction control module is functioning correctly, as these systems often control the LED indicators

13. Clear the Code

14. After performing any repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

15. Scan for Additional Codes

16. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

17. Consult a Professional

18. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and resolve the issue related to the C1920 code