Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Normal Operation
The ABS module receives the brake fluid level information and the brake pedal position (BPP) switch information over the high-speed controller area network (HS-CAN) bus. The PCM provides the BPP switch information and the instrument cluster provides the brake fluid level information.
- DTC C1446 Brake Fluid Level Low/Brake Switch Circuit Failure - If during normal operation or the on-demand self test the ABS module does not receive the brake fluid level message and/or the BPP switch message, or if the BPP message is inconsistent with other sensor information, DTC C1446 will be set.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Brake fluid level
- BPP switch
- Instrument cluster
- PCM
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.