C1446 on Ford

Brake switch circuit failure (Ford)

Severity: Severity not verified — if the car runs badly, have it inspected

The sources say the ABS module saw a brake switch circuit fault but do not rate drive safety; brakes are safety-critical, so have it checked.

Safety-critical system: explanation only, no DIY steps. Source: how we rate severity

This page covers only what differs on Ford. For what C1446 means, the ranked causes and the test order, see the C1446 guide.

What's different on Ford

Ford

2006 · F-250 Super Duty
Possible — needs testing
One owner-reported 2006 F-250 Super Duty case traced C1446 to the master cylinder low fluid level switch while the brake lights worked. Single case, not a bulletin.

Sources and review

Code C1446 brake light switch circuit fault (2006 Ford F-250 Super Duty) — Ford Doctors DTS forum
C1446 fault code: Brake Switch Circuit Failure — The Automotive Technician (TaT)

Last reviewed: October 15, 2026
Written by: Saurabh K.
Editorial review: Pending
Technician review: Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error