!!
critical Buick
Error Code $F$U
Low fuel warning - indicates imminent depletion of engine tank resources requiring immediate refueling.
? What Causes This
Fuel gauge malfunction, low actual fuel level in the tank.
✓ How to Fix It
Refuel as soon as possible or contact roadside assistance if unable to reach a station safely.
Source: page 144 of the official manual
From the manual
This error code appears in:
Buick Enclave