B1780
Front Occupant Classification Sensor Left Circuit Malfunction
B1780 is an OBD-II diagnostic trouble code meaning: Front Occupant Classification Sensor Left Circuit Malfunction. Common causes: open or short circuit in the sensor wiring harness, damage to the passenger classification sensor itself. Estimated repair cost: $56–167.
Symptoms
- Airbag light is on
- The system can disable the front passenger airbag
- Possible false alarms of the system
Causes
- Open or short circuit in the sensor wiring harness
- Damage to the passenger classification sensor itself
- Airbag module malfunction
- Corrosion or poor contact in connectors
How to Fix
- Conduct a visual inspection of the sensor wiring harness and connectors
- Check the continuity of the sensor circuit using a multimeter
- If necessary, replace the passenger classification sensor
- Reset the error and check the system operation
Related codes
FAQ
What does the B1780 code mean?
B1780 is an OBD-II diagnostic trouble code that indicates: Front Occupant Classification Sensor Left Circuit Malfunction
What causes a B1780 error code?
The most common causes of B1780 include: Open or short circuit in the sensor wiring harness; Damage to the passenger classification sensor itself; Airbag module malfunction; Corrosion or poor contact in connectors.
How do I fix a B1780 diagnostic trouble code?
To fix B1780: Conduct a visual inspection of the sensor wiring harness and connectors. Check the continuity of the sensor circuit using a multimeter. If necessary, replace the passenger classification sensor. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B1780?
Do not drive — repair immediately
How much does it cost to fix B1780?
The estimated repair cost for B1780 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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