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DTC codes / C07xx · Brakes, steering and suspension / C0750

C0750Cruise Control Brake Switch

C0750 is a generic chassis code indicating that the cruise control module has detected an implausible or missing signal from the brake pedal switch circuit. The computer expects the brake switch to change state when the pedal is pressed or released, and it sets this code when the voltage or continuity does not match that expectation.

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

Symptoms you may notice

  • Cruise control will not engage or disengages as soon as you press the brake pedal
  • The cruise control indicator light may flash or stay off entirely
  • Brake lights may fail to illuminate or may stay on constantly
  • A warning light on the dashboard, often the cruise or brake system indicator
  • Often no symptoms besides the warning light, with cruise control still working normally
  • The vehicle may refuse to start if the brake switch also controls the starter interlock

Common causes, most likely first

  1. Faulty brake pedal position switch (also called the brake light switch) with worn contacts or a broken internal spring
  2. Misadjusted brake switch bracket or plunger, so the switch does not change state at the correct pedal travel
  3. Damaged or corroded wiring harness connector at the brake switch, often from water intrusion or repeated pedal movement
  4. Open or shorted wire in the brake switch circuit between the switch and the cruise control module
  5. Blown fuse or poor ground connection shared by the brake switch and cruise control system
  6. Failed cruise control module that cannot read the brake switch input correctly
  7. Aftermarket or incorrect brake switch installed that does not match the vehicle's wiring logic

How to diagnose and fix it

  1. Check the brake light operation first: have a helper watch the rear lights while you press and release the pedal, and note any delay or failure.
  2. Inspect the brake switch connector and wiring for corrosion, loose pins, or chafed insulation, and clean or repair as needed.
  3. Test the brake switch with a multimeter for continuity and voltage changes in both pedal positions, comparing to the manufacturer's specification.
  4. Verify the switch adjustment: the plunger should fully depress when the pedal is released and release cleanly when the pedal is pressed.
  5. Check the fuse and ground for the brake switch circuit, and confirm battery voltage at the switch with the key on.
  6. If the switch and wiring test good, backprobe the cruise control module connector to confirm the brake signal reaches the module.
  7. Replace the brake switch only after electrical tests confirm it is faulty, then clear the code and verify cruise control operation on a road test.

Brake switch checks before replacing parts

  • A brake switch can test fine with a multimeter but still set C0750 intermittently because the internal contacts wear and lose continuity only when the pedal is at a certain position.
  • Many vehicles use two separate switches or a dual-contact switch: one for the brake lights and one for the cruise control module, so the brake lights may work perfectly while the cruise input is dead.
  • The cruise control module often monitors brake switch voltage on two wires and compares them; a single high-resistance connection on one wire can set this code without any blown fuse.
  • After replacing a brake switch, the new switch usually needs to be adjusted or it will set the same code immediately, so follow the pedal-depression setup procedure.
  • This code can be stored by a low battery or a voltage spike during jump-starting, so check for a history of electrical events before condemning the switch.

Can I keep driving with C0750?

The vehicle remains safe to drive because the base brakes are unaffected, but cruise control may be inoperative and brake lights could be unreliable. Avoid using cruise control until the fault is repaired, and verify brake light operation before driving at night or in traffic.

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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