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DTC codes / C05xx · Brakes, steering and suspension / C0594

C0594Brake Pedal Travel Sensor

C0594 indicates that the antilock brake system (ABS) module has detected an implausible or out-of-range signal from the brake pedal travel sensor, which measures how far the brake pedal is depressed. The computer compares this signal with other brake inputs and sets the code when the voltage or position reading does not match expected values during key-on or braking events.

SystemChassis
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaBrakes, steering and suspension

Symptoms you may notice

  • ABS warning light illuminated on the dashboard
  • Traction control or stability control warning light may also be on
  • Brake pedal feels normal in most cases, with no change in braking performance
  • Often no symptoms besides the warning light
  • In some vehicles, the cruise control may become inoperative
  • Rarely, a slight delay or hesitation in brake response if the sensor signal is erratic

Common causes, most likely first

  1. Faulty brake pedal travel sensor (worn internal contacts or damaged sensing element)
  2. Damaged or disconnected electrical connector at the sensor
  3. Corroded or chafed wiring between the sensor and the ABS module
  4. Improper sensor installation or misadjusted linkage after prior brake pedal work
  5. Failed ABS control module (internal signal processing fault)
  6. Contamination or debris obstructing the sensor's mechanical travel path

How to diagnose and fix it

  1. Connect a scan tool and read all ABS codes plus live data from the brake pedal travel sensor to confirm the signal is erratic or out of range.
  2. Visually inspect the sensor, its connector, and the wiring harness for damage, corrosion, or loose pins; repair as needed.
  3. Check the sensor's mechanical linkage and adjustment, ensuring the pedal moves the sensor through its full range without binding.
  4. Measure the sensor's voltage output with a multimeter while slowly pressing the brake pedal, comparing to the manufacturer's specification.
  5. If the sensor signal is confirmed faulty, replace the brake pedal travel sensor and clear the code.
  6. After replacement, perform any required calibration or relearn procedure for the brake pedal position sensor using a scan tool.
  7. If the code persists with a known-good sensor and wiring, diagnose the ABS module and its power/ground circuits before replacement.

What the brake pedal travel sensor code hides

  • A brake pedal travel sensor code often appears after brake pedal or booster work because the sensor was disturbed or its linkage was not reconnected correctly.
  • The sensor is sometimes integrated into the brake pedal assembly or the master cylinder pushrod, so a simple sensor replacement may require replacing a larger assembly on some vehicles.
  • A weak or failing battery can cause the ABS module to set false sensor codes during cranking, so always check battery voltage and charging system health first.
  • The code can be set by a mismatch between the brake pedal travel sensor and the brake pressure sensor, so a faulty pressure sensor may be the real culprit.
  • Clearing the code without fixing the underlying issue often leads to the light returning after a few drive cycles, especially if the sensor signal is intermittent.

Can I keep driving with C0594?

The vehicle remains safe to drive under normal braking because the base hydraulic brakes are unaffected, but ABS and stability control may be disabled. Avoid hard braking or emergency maneuvers until the fault is repaired, and have the system diagnosed promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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