Why has my cruise control stopped working?

A faulty brake pedal switch is one of the most common reasons. Cruise control has to disengage the moment you touch the brake, so the system checks the two independent contacts inside the switch against each other. If they disagree, or one has failed, the system cannot be certain it would cut out when you brake, so it refuses to engage at all. It is a deliberate safety refusal rather than a fault in the cruise control itself, and the fix is usually a cheap switch.

Does C0750 affect my brakes?

Not the braking itself. The hydraulic system, the pedal, the master cylinder and the brakes all work normally, because the switch only reports that the pedal has moved. What it can affect is your brake lights, since the same switch usually operates them, and that is a safety issue for the traffic behind you. Check whether your brake lights work properly before driving, and treat that as the real problem rather than the loss of cruise control.

Is C0750 a tyre pressure code?

Not in the fault code standard this site uses, where C0750 is the cruise control brake switch. Some manufacturers do use codes in this numeric region for tyre pressure monitoring, which is why the question comes up, and it is a good illustration of why the manufacturer's own definition matters for chassis and body codes. If you are chasing a tyre pressure monitoring fault, the per-corner sensor codes and the module fault codes are the ones to look at, not this.

Will C0750 fail an MOT?

Cruise control is not part of the MOT, so the loss of that feature will not fail anything. What can fail is the side effect. The tester checks the stop lamps by operating the pedal, and brake lights that do not work or that stay on permanently are recordable defects. If the switch fault has also lit the ABS or stability warning lamp, a brake system warning device indicating a malfunction is a major defect with 85,196 recorded failures behind it.

Chassis code · standard

C0750Cruise control brake switch fault

Standard definition: Cruise Control Brake Switch

Last updated 27 July 2026

Quick answer

The cruise control system is getting an unreliable signal from the brake pedal switch, which is how it knows to disengage when you brake. Cruise control will refuse to work, and the brake lights are often affected too.

How the car works this out

Cruise control must switch off the instant the brake is touched, and that is too important to trust to a single contact. The system reads both sides of the twin-contact brake pedal switch and checks them against each other, and on many cars against the brake light circuit as well. C0750 is set when the two signals disagree, when one of them fails to change as the pedal moves, or when the circuit is open. It is worth being clear about what this code is: despite the number falling in a range that some manufacturers use for tyre pressure monitoring, in the fault code standard this site uses it is the cruise control brake switch, and the diagnosis is a pedal switch rather than a wheel.

What you might notice

Cruise control refusing to engage at all, or cancelling immediately
Cruise control dropping out over bumps
Brake lights permanently on, or not working
Automatic gear selector locked in park
Stop-start behaving oddly
ABS or stability lamps on as well, where the same switch feeds those modules

What causes it

Most likely first. A code names the check that failed, not the part that failed it, so more than one of these can produce the same number.

1A failed or out-of-adjustment brake pedal switchCommon
How to check: Watch the brake light behaviour with light and full pedal pressure. Lights that respond too early, too late or not at all point straight at the switch.
2A crumbled or missing pedal stop pad behind the brake pedalCommon
How to check: Look for a small plastic plug on the bracket the pedal rests against, and for its remains in the footwell.
3A corroded or partly unplugged switch connectorPossible
4Damaged wiring in the footwell, often disturbed by aftermarket accessories wired under the dashboardPossible
5A fault in the cruise control or engine control module's input circuitLess common

What to do about it

1Check the brake lights before worrying about the cruise control. They matter far more, and the same switch usually operates both.
2Inspect the pedal stop pad, which is a very cheap part with a habit of disintegrating on cars of a certain age.
3Have the switch tested and adjusted, and follow the correct fitting procedure if it is replaced, since many self-adjust on first use.
4Mention any recent dashcam, tracker or stereo installation, because wiring run into the footwell is a recognised way of disturbing this circuit.
5Do not assume the cruise control module has failed. It is almost always the switch, and that is the cheap end of the possibilities.

Can you keep driving?

Only to a garage

The braking system itself is unaffected and the car stops normally. Whether it is safe depends entirely on your brake lights: if they are not working, drivers behind have no warning when you slow, and that is a real risk rather than an inconvenience. Check them before you set off. Losing cruise control on its own is merely annoying.

Will it fail an MOT?

Cruise control is not tested during an MOT, so the feature itself is not the issue. What is tested, on every car, is the stop lamps: the tester operates the brake pedal and checks that both lamps work, show the correct colour, and are not affected by the operation of any other lamp. Brake lights that fail to come on, or that stay on permanently, are recordable defects. If the same switch fault has lit the ABS or stability lamp, that is a major defect too, with 85,196 recorded failures against a brake system warning device indicating a malfunction.

The light this turns on

Brake warning lightWith the handbrake fully off, a red brake lamp means the car is reporting a problem with the braking system itself — most often fluid that has dropped below the minimum mark, or a fault in the electronic side of the brakes. Treat it as a reason to stop and check rather than a reason to press on.

Common questions

Why has my cruise control stopped working?: A faulty brake pedal switch is one of the most common reasons. Cruise control has to disengage the moment you touch the brake, so the system checks the two independent contacts inside the switch against each other. If they disagree, or one has failed, the system cannot be certain it would cut out when you brake, so it refuses to engage at all. It is a deliberate safety refusal rather than a fault in the cruise control itself, and the fix is usually a cheap switch.
Does C0750 affect my brakes?: Not the braking itself. The hydraulic system, the pedal, the master cylinder and the brakes all work normally, because the switch only reports that the pedal has moved. What it can affect is your brake lights, since the same switch usually operates them, and that is a safety issue for the traffic behind you. Check whether your brake lights work properly before driving, and treat that as the real problem rather than the loss of cruise control.
Is C0750 a tyre pressure code?: Not in the fault code standard this site uses, where C0750 is the cruise control brake switch. Some manufacturers do use codes in this numeric region for tyre pressure monitoring, which is why the question comes up, and it is a good illustration of why the manufacturer's own definition matters for chassis and body codes. If you are chasing a tyre pressure monitoring fault, the per-corner sensor codes and the module fault codes are the ones to look at, not this.
Will C0750 fail an MOT?: Cruise control is not part of the MOT, so the loss of that feature will not fail anything. What can fail is the side effect. The tester checks the stop lamps by operating the pedal, and brake lights that do not work or that stay on permanently are recordable defects. If the switch fault has also lit the ABS or stability warning lamp, a brake system warning device indicating a malfunction is a major defect with 85,196 recorded failures behind it.

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