What Does C1294 Mean?
The brake lamp switch circuit is always showing an active (closed/on) state, regardless of whether the brake pedal is being pressed. This means the brake lights may be on continuously, confusing following drivers, and the ABS/ESC module receives a perpetual 'braking' signal that interferes with normal system operation. Cruise control will likely not engage, and fuel economy may suffer.
Common Causes
35%
Brake lamp switch stuck closed or shorted internally
25%
Brake lamp switch improperly adjusted (plunger always compressed)
20%
Wiring short between the switch output and a power source
15%
Brake pedal not fully returning to rest position (binding pedal, weak return spring)
5%
Aftermarket brake light circuit modification creating a feedback path
Diagnostic Steps
1
Check if the brake lights are physically on with no pedal input — have someone observe while the vehicle is parked with the engine running and foot off the brake. Continuously lit brake lights confirm the always-active state.
2
Inspect the brake lamp switch at the pedal — verify the switch plunger fully extends when the pedal is released. If the brake pedal bumper is missing, the pedal may not push the switch plunger far enough to open the circuit.
3
Disconnect the brake lamp switch connector and check if the fault clears and brake lights turn off. If lights stay on with the switch disconnected, the short is downstream in the wiring harness.
4
Test the switch with a multimeter: with the plunger extended (pedal released), the switch should be open (no continuity). With the plunger compressed (pedal pressed), it should be closed. A switch that always shows continuity needs replacement.
5
Verify the brake pedal fully returns to its rest position — press and release the pedal while watching the pedal movement. A sticking pedal can hold the switch partially engaged.
Estimated Repair Cost
$15 - $150
Parts + labor, varies by vehicle and location
The brake lamp switch circuit is always showing an active (closed/on) state, regardless of whether the brake pedal is being pressed. This means the brake lights may be on continuously, confusing following drivers, and the ABS/ESC module receives a perpetual 'braking' signal that interferes with norm...
The most common cause of C1294 (Brake Lamp Switch Circuit Always Active) is: Brake lamp switch stuck closed or shorted internally
Typical repair costs for C1294 range from $15 to $150, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Continuously lit brake lights desensitize following drivers to actual braking events, increasing rear-end collision risk. The ABS/ESC system may not function correctly with a perpetual brake signal. Cruise control will be inoperative. The fix is usually a simple switch replacement or adjustment. Repair promptly — this affects both safety and driveability.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1294 to identify the root cause.
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Quick Info
Category
Chassis
System
Brake System / Vehicle Lighting
Difficulty
Type
Manufacturer
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