The C0244 diagnostic code on a 2023 GMC Sierra indicates a malfunction in the brake fluid level sensor circuit. This sensor monitors the brake fluid reservoir and alerts the driver when fluid drops below safe operating levels, which could indicate a leak or worn brake pads.
Brake Fluid Level Sensor Function
The reservoir-mounted sensor uses a float mechanism connected to an electrical switch or Hall-effect sensor. When fluid level drops, the float descends and triggers a circuit state change. GM's Electronic Brake Control Module (EBCM) monitors this circuit and stores C0244 when the signal is out of expected parameters or indicates an electrical fault.
Symptoms and Warnings
With C0244 active, the brake warning light typically illuminates on the dashboard. Depending on how the code sets, you may also see the ABS light activate. The driver information center may display a brake system message. The actual brake fluid level may be normal, indicating an electrical fault rather than a low-fluid condition.
Diagnosis Procedure
First, verify actual brake fluid level in the reservoir. If the level is low, inspect for leaks at calipers, wheel cylinders, lines, and hoses before addressing the sensor code. If the level is normal, the fault lies in the sensor or its circuit. Check the sensor connector for corrosion, verify wiring integrity, and test sensor function by simulating low-fluid conditions.
Repair Options
The brake fluid level sensor is typically part of the reservoir cap assembly or a standalone unit mounted in the reservoir. Replacement is straightforward once the correct part is sourced. Ensure the new sensor clicks securely into place and the connector is properly seated. Clear codes and verify the warning light extinguishes.