What Does C1297 Mean?
The PCM has reported to the ABS/ESC module that the brake extended travel switch has failed. This switch detects when the brake pedal travels beyond its normal range, which indicates low brake fluid, air in the lines, or a brake hydraulic failure. The ABS module uses this information to modify its control strategy and alert the driver to a potential loss of braking effectiveness.
Common Causes
30%
Failed brake extended travel switch (stuck open or closed)
25%
Wiring fault between the extended travel switch and the PCM
15%
PCM not receiving the switch signal due to internal PCM circuit fault
20%
Brake pedal actually reaching extended travel due to low brake fluid or air in the system
10%
PCM-to-EBCM communication issue reporting a false switch failure
Diagnostic Steps
1
Check the brake fluid level first — low fluid will cause excessive pedal travel and may trigger this switch legitimately. Top off and inspect for leaks at all four wheels, calipers, lines, and the master cylinder.
2
With the engine running, press the brake pedal firmly and note the pedal travel — if the pedal goes nearly to the floor, there is a real hydraulic issue (low fluid, air, or master cylinder failure) that must be addressed separately from the switch.
3
Locate the extended travel switch (typically at the brake pedal or integrated into the booster pushrod) and test with a multimeter. It should be open during normal pedal travel and close only when the pedal reaches its maximum extended position.
4
Check for related PCM codes — the EBCM receives this fault information from the PCM via the data bus. A PCM-side wiring fault or internal issue will cause this chassis code as a secondary symptom.
5
Monitor the extended travel switch PID in the PCM data stream while pressing the pedal through its full range — the switch state should toggle only at maximum travel, not during normal braking.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
The PCM has reported to the ABS/ESC module that the brake extended travel switch has failed. This switch detects when the brake pedal travels beyond its normal range, which indicates low brake fluid, air in the lines, or a brake hydraulic failure. The ABS module uses this information to modify its c...
The most common cause of C1297 (PCM Indicated Brake Extended Travel Switch Failure) is: Failed brake extended travel switch (stuck open or closed)
Typical repair costs for C1297 range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If the brake pedal is actually reaching extended travel, this indicates a potentially dangerous loss of braking hydraulic pressure. Check brake fluid and pedal feel immediately. If the pedal feels normal and firm, the issue is likely the switch or its circuit, which is less urgent. Either way, the ABS system may modify its behavior based on this fault. Have the system inspected promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1297 to identify the root cause.
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Quick Info
Category
Chassis
System
Brake System / ABS
Difficulty
Type
Manufacturer
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