C1756 — Air Suspension Front Height Sensor High (SE) Signal Circuit Failure
What it means
C1756 is an OBD-II diagnostic trouble code: Air Suspension Front Height Sensor High (SE) Signal Circuit Failure.
Typical fix
Confirm the code with an OBD-II scanner, then inspect the component or circuit named above. Consult a vehicle-specific service manual for the full diagnostic and repair procedure.