OBD2 Code C1920: Instrument Cluster LED #1 Fault
Code C1920 indicates that the Instrument Cluster (IC) module has detected a fault in the LED #1 circuit, either during its internal self-test or during normal operation. This LED typically corresponds to a specific dashboard warning light, such as the airbag, brake, or check engine light. The fault may be due to an open circuit, a short to ground or battery voltage, or an internal failure of the LED driver within the cluster itself.
1. Commonly Affected Makes
2. Most Common Causes
- LED #1 burned out or internally damaged within the instrument cluster
- Open circuit in the LED wiring (if the LED is replaceable separately)
- Short to ground or voltage in the LED control circuit
- Internal failure of the LED driver (controller) inside the IC module
- Loose or corroded connections at the instrument cluster connector
3. Symptoms You Will Notice
- Specific warning light (e.g., airbag, brake, check engine) stays off or behaves erratically
- Instrument cluster may display a warning message or chime
- Other cluster functions may work normally
4. Step-by-Step Diagnosis
Use a scan tool to retrieve the code and confirm C1920 is present.
Visually inspect the instrument cluster for any burned-out or dim LEDs.
Check the cluster connector for loose pins, corrosion, or damaged wires.
If the LED is replaceable, test the LED circuit with a multimeter for continuity, shorts, and voltage.
If no external fault is found, the cluster likely has an internal failure and may need repair or replacement.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the affected warning light will not function properly, which could hide a critical issue. Have it diagnosed soon.
How much does it cost to fix?▼
Repair costs range from $100 to $500, depending on whether the cluster can be repaired (e.g., replacing an LED) or needs replacement.