What Does C1446 Mean?
This code indicates a failure in the brake switch circuit as monitored by the ABS/traction control module. The brake switch signal tells the module when the driver is applying the brakes, which is critical for distinguishing intentional braking from wheel lockup, and for disabling traction control motor intervention during braking. A failed brake switch circuit can cause traction control to remain active during braking or ABS to intervene inappropriately.
Safety Warning
A failed brake switch circuit can cause the ABS module to misinterpret braking events, potentially allowing traction control to fight the driver's braking input or causing ABS to not activate when needed. Brake lights may also be inoperative, creating a rear-end collision hazard.
Common Causes
40%
Defective brake light switch (stoplight switch) mounted at the brake pedal bracket with internal contact failure
25%
Brake switch out of adjustment, not engaging when brake pedal is depressed, due to worn pedal pad or switch pushrod
20%
Open or high resistance in the brake switch signal wire to the ABS module due to connector corrosion or harness damage
15%
Blown fuse in the brake switch power supply circuit preventing switch signal generation
Diagnostic Steps
1
Step 1: Verify brake lights are functioning when the pedal is pressed. If brake lights do not illuminate, the issue is likely the brake switch itself, its fuse, or power supply circuit. If brake lights work but the ABS module still reports the fault, there may be a separate ABS-dedicated brake switch input.
2
Step 2: Locate the brake light switch at the top of the brake pedal arm. Check for proper adjustment by observing the switch plunger engagement when the pedal is at rest and when slightly depressed. The switch should transition within the first 10-15mm of pedal travel.
3
Step 3: Using a DVOM, verify battery voltage is present at the brake switch input terminal with the key on. Then confirm voltage appears on the output terminal when the pedal is pressed. No voltage change indicates a faulty switch.
4
Step 4: Check the dedicated brake switch signal wire to the ABS module for continuity. Some vehicles use a redundant brake switch or a separate circuit from the brake lights specifically for ABS/traction control. Verify the correct circuit is being tested per the wiring diagram.
5
Step 5: After replacing or adjusting the brake switch, clear codes and test-drive the vehicle. Apply the brakes at various pressures while monitoring live data to confirm the ABS module recognizes brake application and release events.
Estimated Repair Cost
$20 - $150
Parts + labor, varies by vehicle and location
This code indicates a failure in the brake switch circuit as monitored by the ABS/traction control module. The brake switch signal tells the module when the driver is applying the brakes, which is critical for distinguishing intentional braking from wheel lockup, and for disabling traction control m...
The most common cause of C1446 (Brake Switch Circuit Failure) is: Defective brake light switch (stoplight switch) mounted at the brake pedal bracket with internal contact failure
Typical repair costs for C1446 range from $20 to $150, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A failed brake switch circuit can cause the ABS module to misinterpret braking events, potentially allowing traction control to fight the driver's braking input or causing ABS to not activate when needed. Brake lights may also be inoperative, creating a rear-end collision hazard.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1446 to identify the root cause.
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Quick Info
Category
Chassis
System
ABS / Traction Control / Brake System
Difficulty
Type
Manufacturer
Recommended Tools
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