Cruise control stops working for five main reasons: a blown fuse, a faulty brake pedal switch, a damaged cruise control stalk or button, a malfunctioning speed sensor, or a problem with the vehicle's computer system
Most of these are fixable at home or with a basic trip to a mechanic. The good news is that cruise control failure is rarely an emergency — your car runs fine without it, and the underlying cause is usually something small. The bad news is that diagnosing which of these five problems is yours requires some methodical checking, because they all produce the same symptom: the system straightforward does not engage.
Start with the simplest checks first. If you skip straight to the computer, you will waste time and money. Work through these in order, and you will either fix it yourself or know exactly what to tell a mechanic.
Key Takeaways
- Check your owner's manual for the fuse location and amperage, then inspect the cruise control fuse for a broken wire or blackened interior — a blown fuse is the most common cause and costs almost nothing to replace.
- Test your brake pedal switch by pressing the brake while cruise control is on; if cruise control does not disengage, the switch is likely faulty and needs replacement by a mechanic.
- Look at the cruise control stalk or buttons on your steering wheel for cracks, corrosion, or unresponsive buttons, which usually means replacement is necessary.
- A faulty vehicle speed sensor will prevent cruise control from engaging at all, and this requires a mechanic to diagnose and replace.
- If all other checks pass, the problem may be in the vehicle's main computer, which requires professional diagnostic equipment to confirm.
Check the cruise control fuse first
A blown fuse is the most common reason cruise control stops working, and it is the easiest to fix yourself. Your owner's manual lists the fuse box location — usually under the dashboard on the driver's side, under the hood, or both. Open the cover and look for the diagram printed on the inside; it will tell you which fuse controls cruise control.
Pull that fuse straight out and hold it up to a light. A good fuse has a continuous wire running through the middle. A blown fuse has a broken wire or a blackened, burned-looking interior. If it is blown, replace it with a new fuse of the exact same amperage — the number is printed on the fuse itself, usually 10, 15, or 20 amps. Do not use a higher amperage fuse; it will not protect the circuit properly. Fuses cost a dollar or two, and you can buy them at any auto parts store or gas station.
If the fuse is intact, move to the next check. If you replaced a blown fuse and cruise control now works, you are done. If it blows again within a few weeks, there is an electrical short somewhere in the cruise control system, and you need a mechanic to find it.
Test whether your brake pedal switch is working
Cruise control is designed to turn off the moment you touch the brake pedal. This is controlled by a small switch mounted under the brake pedal. If this switch fails, cruise control will not engage at all, because the system thinks the brake is always being pressed.
To test it, turn on the ignition without starting the engine. Press the cruise control button to turn the system on — you should see a light on the dashboard. Now press the brake pedal. The cruise control light should go out. If it does not, the brake pedal switch is faulty.
A faulty brake pedal switch is not a do-it-yourself repair for most people. The switch is mounted under the dashboard, and accessing it requires removing trim panels. Take the car to a mechanic; the part itself costs $20 to $50, and labor is usually $100 to $200 depending on how straightforward it is to reach in your vehicle.
Inspect the cruise control stalk or buttons
The stalk or buttons on your steering wheel are the physical interface between you and the cruise control system. If they are damaged, the system cannot receive your commands. Look closely at the stalk or button cluster for visible cracks, corrosion, or water damage. Press each button several times — they should click and feel responsive.
If a button feels mushy, does not click, or does not respond, the internal switch inside is likely broken. Moisture or dirt can also corrode the contacts inside. In some cases, you can clean the contacts with electronic contact cleaner, but usually the stalk or button pad needs to be replaced. This is a steering wheel component, so replacement requires removing the airbag and the steering wheel itself — a job for a mechanic, typically $150 to $300 in labor.
Have the vehicle speed sensor checked
Your vehicle's speed sensor tells the cruise control system how fast you are going. If this sensor fails, cruise control cannot function because it has no way to measure your speed. A faulty speed sensor usually produces other symptoms too: your speedometer may flicker or read incorrectly, your anti-lock brakes may malfunction, or your traction control light may come on.
If you see any of these signs along with cruise control failure, the speed sensor is a strong suspect. The sensor is mounted on or near the transmission or a wheel hub, depending on your vehicle. Locating it and replacing it requires getting under the car and using a wrench or socket set. This is not a beginner job. A mechanic can diagnose and replace it in about an hour; the part costs $50 to $150, and labor is usually $100 to $200.
Rule out a computer or electrical fault
If you have checked the fuse, the brake pedal switch, the steering wheel buttons, and the speed sensor, and none of them are the problem, the issue is likely in the vehicle's main computer or in the wiring harness that connects these components. These faults require a diagnostic scanner — a tool that reads error codes from your vehicle's computer.
You cannot diagnose this yourself without a scanner. Take the car to a mechanic and tell them you have already ruled out the fuse, brake switch, and buttons. A diagnostic scan usually costs $75 to $150 and will pinpoint whether the problem is a wiring issue, a relay, or the computer itself. Once the mechanic knows what is wrong, they can give you a repair estimate.
When to call a mechanic versus fixing it yourself
The only cruise control repair most people can do at home is replacing a blown fuse. Everything else — brake pedal switch, steering wheel buttons, speed sensor, wiring, or computer issues — requires tools, access, or diagnostic equipment that a home mechanic does not have.
If you are comfortable working under a car and have basic tools, you might attempt to access and clean the steering wheel button contacts yourself. For everything else, the labor cost of a mechanic is worth it because you avoid the risk of damaging other components. A mechanic can also run a diagnostic scan to confirm the problem before you pay for parts, which saves money in the long run.
Frequently Asked Questions
Can I drive safely without cruise control?
Yes, completely. Cruise control is a convenience feature, not a safety system. Your car will run normally in every other way. You straightforward control the accelerator manually until you have the system repaired.
Why did my cruise control suddenly stop working?
Usually because a fuse blew, the brake pedal switch failed, or moisture got into the steering wheel buttons. Sudden failure is more often electrical than mechanical. Start with the fuse check.
Is cruise control expensive to repair?
It depends on the cause. A fuse costs $1 to $5. A brake pedal switch or speed sensor replacement runs $150 to $400 total. A steering wheel button replacement can be $200 to $400. A computer fault diagnosis is $75 to $150, and repair depends on what is found.
Can water damage cause cruise control to fail?
Yes. Water in the steering wheel buttons or in the wiring harness can corrode contacts and break connections. If your car was recently flooded or exposed to heavy rain, water damage is a likely cause. A mechanic can inspect for corrosion.
Will cruise control work again if I just wait?
Not unless the problem was a temporary electrical glitch, which is rare. A blown fuse, faulty switch, or damaged button will not repair itself. The system will stay broken until you fix the underlying cause.