This article was updated in February 11, 2026 with new products and information by Mark S. Taylor
You are driving on the highway. Your leg gets tired. You press the cruise button, but nothing happens. This is frustrating. A cruise control not working issue is common. It is usually a simple fix. It might be a bad switch or a fuse. Sometimes it points to a bigger problem. This guide covers the 10 most common causes. We will show you how to diagnose the problem. You will learn which fixes are cheap and easy. You can save money by doing it yourself. Let’s get your cruise control working again.
Contents
How Cruise Control Works
Cruise control uses sensors to keep your car at a set speed automatically. A computer in your car runs the system. It is called the PCM. It talks to the speed sensor and the gas pedal. When you set a speed, the computer holds it there.
Basic Cruise Control System Components
The system needs a few key parts to work. The PCM is the brain. The Vehicle Speed Sensor (VSS) tells the brain how fast you go. The throttle controls the engine power. If the brake lights do not work, the cruise will not turn on. This is a safety rule.
Adaptive Cruise Control (ACC) Differences
Adaptive cruise is smarter than standard cruise. It uses radar or cameras to see the car ahead of you. It slows down automatically if traffic stops. These systems have more parts that can break. They often need a professional to fix them.
Why Cruise Control Automatically Disables
Cruise control turns off if it thinks there is a safety problem. If the engine is acting up, it shuts off. If the brake system has a fault, it shuts off. This is to keep you safe.
10 Common Reasons Cruise Control Stops Working
1. Faulty Brake Light Switch (Most Common—40% of Cases)
A bad brake light switch is the number one reason cruise control fails. This switch sits near your brake pedal. It tells the car when you press the brakes. If it breaks, the computer thinks you are braking all the time.
Symptoms:
- Cruise will not set.
- Brake lights stay on all the time.
- Or, brake lights do not work at all.
How to test: Press the brake pedal. Ask a friend to look at your lights. If the lights do not work, the switch is bad.
Fix and Cost:
- Difficulty: Easy to Medium.
- Cost: $15-$40 for the part.
- DIY: Yes, you can do this at home.
2. Blown Fuse
A blown fuse cuts power to the cruise control system. Fuses protect your car’s wires. If a fuse blows, the cruise control has no electricity.
Symptoms:
- The cruise button does nothing.
- No lights turn on.
How to fix: Find the fuse box. Look for the cruise fuse. If the metal strip inside is broken, replace it.
Fix and Cost:
- Difficulty: Very Easy.
- Cost: $1-$5.
- DIY: Yes, anyone can do this.
3. Bad Vehicle Speed Sensor (VSS)
The speed sensor tells the computer how fast you are driving. If this sensor breaks, the car does not know the speed. Cruise control cannot work without it.
Symptoms:
- Cruise control won’t engage.
- Speedometer bounces or stays at zero.
- Check engine light is on.
How to fix: Use a scanner to read error codes. You will likely see a code like P0500.
Fix and Cost:
- Difficulty: Medium.
- Cost: $30-$80 for the part.
- DIY: Yes, if you can reach the sensor.
4. Check Engine Light Active
Most cars turn off cruise control if the check engine light is on. This is a safety feature. If the engine has a problem, the car disables cruise.
Symptoms:
- Check engine light is glowing.
- Cruise button does not respond.
How to fix: You must fix the engine problem first. Read the codes to see what is wrong. Once the engine is fixed, the cruise will work again. You can learn more about common engine codes on our blog.
Fix and Cost:
- Cost: Varies wildly. Could be cheap or very expensive.
5. Cruise Control Switch/Button Failure
The buttons on your steering wheel or stalk can wear out. You use these buttons to set the speed. If they get dirty or break, they stop sending signals.
Symptoms:
- One button works, but another does not.
- You have to press the button very hard.
How to fix: Test each button. If a specific button fails, you might need a new switch unit.
Fix and Cost:
- Difficulty: Easy to Hard.
- Cost: $30-$120 for the part.
6. Clockspring/Spiral Cable Failure (Steering Wheel Controls)
The clockspring is a wire coil that connects the steering wheel to the car. It lets you turn the wheel while keeping buttons connected. If it breaks, your steering wheel buttons stop working.
Symptoms:
- Cruise buttons on the wheel don’t work.
- The horn does not work.
- Airbag light is on.
How to fix: This involves the airbag. It is best to let a pro fix this.
Fix and Cost:
- Difficulty: Hard.
- Cost: $150-$300 for the part.
- DIY: Not recommended due to airbag risk.
7. Vacuum Leak (Older Vehicles with Cable-Driven Cruise)
Old cars use vacuum hoses to control the cruise. If a hose cracks or leaks, the system loses pressure. The cruise will not hold the speed.
Symptoms:
- Cruise won’t set.
- Engine hisses under the hood.
- Engine runs rough.
How to fix: Look for cracked hoses. Replace any leaking rubber hoses.
Fix and Cost:
- Difficulty: Easy.
- Cost: $10-$30.
8. Cruise Control Module/Amplifier Failure
The module is the brain dedicated to the cruise system. Sometimes this electronic part fails completely. This is rare but it does happen.
Symptoms:
- Everything else works fine.
- Cruise just won’t engage.
- No error codes are stored.
How to fix: You usually have to replace the module. It may need programming at a dealer.
Fix and Cost:
- Difficulty: Hard.
- Cost: $200-$500 for the part.
9. Throttle Position Sensor (TPS) Issues
This sensor tells the computer how far you have pressed the gas pedal. If it sends bad data, the cruise control gets confused.
Symptoms:
- Engine surges or hesitates.
- Cruise control won’t hold a steady speed.
How to fix: Scan for codes P0120 to P0124. Replace the sensor if it fails.
Fix and Cost:
- Difficulty: Easy to Medium.
- Cost: $50-$150 for the part.
10. Adaptive Cruise Control Sensor Issues (Modern Vehicles)
Modern cars use radar or cameras to see the road. If this sensor gets dirty or blocked, the system shuts down.
Symptoms:
- Dashboard says “Radar blocked.”
- Adaptive cruise features stop working.
How to fix: Clean the sensor. It is usually behind the front grille or badge. Use a soft cloth.
Fix and Cost:
- Difficulty: Very Easy.
- Cost: $0.
- External Tip: Visit SaferCar.gov for more on vehicle safety tech.
Quick Diagnostic Steps (Start Here)
You can find the problem in just 5 minutes with these simple checks.
5-Minute Checks Anyone Can Do
Step 1: Test Brake Lights (2 minutes) Press the pedal. Do the lights come on? If they stay on or stay off, the switch is bad.
Step 2: Check Fuse (2 minutes) Find the fuse box. Look for the cruise fuse. Is the wire inside broken?
Step 3: Look for Check Engine Light (10 seconds) Is the yellow engine light on? If yes, the cruise will not work until you fix the engine.
Step 4: Test Cruise Buttons (1 minute) Turn the key on. Press the cruise button. Does the light on the dash appear?
Step 5: Check for Dashboard Messages (10 seconds) Look for a warning that says “Cruise Unavailable” or “Service Cruise Control.”
How to Diagnose with OBD-II Scanner
A scanner tool reads the computer codes to tell you exactly what is wrong.
Scanning for Cruise Control Codes
Plug the scanner under the dash. Turn the key on. Look for codes.
- P0560-P0563: Voltage issues.
- P0500-P0503: Speed sensor problems.
- P0120-P0124: Throttle sensor issues.
What to Do with Code Results
Write the codes down. Fix the problem they point to. Clear the codes. Test the cruise again. If the codes come back, the problem is not fixed.
Scanner recommendations:
- Budget: Autel AL319 ($35).
- Pro: Autel MaxiCOM ($300+).
- Free: Auto parts stores often scan for free.
Repair Cost Breakdown (2026 Pricing)
| Problem | DIY Parts Cost | Professional Cost | Difficulty | Time |
|---|---|---|---|---|
| Blown fuse | $1-5 | $50-100 | Very Easy | 5 min |
| Brake light switch | $15-40 | $75-150 | Easy-Med | 30-60 min |
| Speed sensor (VSS) | $30-80 | $100-250 | Medium | 45-90 min |
| Cruise switch | $30-120 | $100-300 | Easy-Hard | 30-120 min |
| Vacuum hose | $10-30 | $100-200 | Easy | 20-40 min |
| Clockspring | $150-300 | $300-600 | Hard | 90-180 min |
| ACC sensor cleaning | $0 | $100-150 | Very Easy | 5-10 min |
DIY Fixes You Can Do at Home
You can fix many cruise control problems yourself with basic tools.
Replacing a Blown Fuse (Very Easy)
Turn the car off. Find the fuse box. Pull the bad fuse out. Put a new one in. It takes 5 minutes. If the new fuse blows right away, stop. You have a wiring problem. A pro should look at it.
Replacing Brake Light Switch (Easy-Medium)
Look under the dash near the brake pedal. Unplug the old switch. Twist it out. Put the new one in. Plug it back in. Test your brake lights. Then test the cruise.
Cleaning Adaptive Cruise Radar Sensor (Very Easy)
Look at the front of your car. Find the radar emblem or sensor in the grille. Wipe it clean with a damp cloth. Do not use harsh chemicals. This fixes many “Radar Blocked” errors.
When to See a Mechanic
Some problems are too complex or dangerous to fix at home.
Problems Requiring Professional Diagnosis
You should see a mechanic if you need to fix the clockspring. This involves the airbag. You should also see a pro for adaptive cruise calibration. These sensors need special tools to aim correctly. If you have no codes but nothing works, a pro can trace the wires.
Choosing the Right Repair Shop
- Dealership: Best for adaptive cruise and module programming.
- Independent Mechanic: Good for switches and sensors.
- Mobile Mechanic: Good for coming to you for fuses and switches.
Cruise Control Types and Specific Issues
Different types of cruise control have different common problems.
Standard Cruise Control (Electronic Throttle)
This uses the car’s computer to control speed. It is simple. Common issues are fuses and brake switches.
Adaptive Cruise Control (ACC)
This uses radar or cameras. It is high-tech. Common issues are dirty sensors or software bugs.
Legacy Cable-Actuated Cruise Control
Old cars use a cable and vacuum. Common issues are vacuum leaks and broken cables.
Preventive Maintenance for Cruise Control
Taking care of the system helps it last longer.
Regular Checks (Every Oil Change)
Test your brake lights. Make sure they turn on and off quickly. Clean the front camera or radar. Test the cruise on a safe road.
Things That Extend Cruise Control Life
Fix the check engine light fast. Replace brake bulbs right away. Keep the windshield clean for camera systems.
Safety Implications of Non-Working Cruise
A broken cruise control often points to other safety issues.
Why It’s More Than Inconvenience
If the brake switch is bad, your brake lights might not work. This is dangerous. People behind you won’t know you are stopping. If the speed sensor is bad, your speedometer and ABS might fail too. Do not ignore these problems.
Legal Considerations
Driving with bad brake lights can get you a ticket. You might fail a safety inspection. Fix the brake switch even if you don’t care about cruise.
FAQs About Why Cruise Control Not Working
Q: Why is my cruise control not working?
A: It is usually a bad brake light switch, a blown fuse, or a bad speed sensor. Sometimes a check engine light will turn it off. Test your brake lights first.
Q: How do I know if my brake light switch is bad?
A: Press the brake pedal. If the lights do not come on, or if they stay on all the time, the switch is bad. You might also not be able to shift out of park.
Q: Can a blown fuse cause cruise control not to work?
A: Yes. A blown fuse cuts all power to the system. Check your fuse box and replace any broken fuses.
Q: Will check engine light disable cruise control?
A: Yes. Most cars disable cruise as a safety measure when the engine light is on. You must fix the engine problem first.
Q: How much does it cost to fix cruise control?
A: It can be free if it is just a fuse. It can cost $150 for a brake switch. Complex sensor repairs can cost over $1,000.
Bottom Line: Fixing Non-Working Cruise Control
Most cruise control problems are easy and cheap to fix. Start by checking the brake lights and the fuses. These two checks solve most cases. If those are fine, use a scanner to read the codes. Do not ignore a broken cruise system. It often means your brake lights or speed sensors are failing. Fixing it keeps you safe and makes long drives much easier.
Quick Summary
- Check brake lights: If they don’t work, the switch is likely broken.
- Check fuses: A blown fuse is a very common cause.
- Scan for codes: A scanner tells you if the sensor or computer is bad.
- Clean sensors: If you have adaptive cruise, keep the radar clean.
- Fix engine lights: Cruise won’t work if the check engine light is on.
- Mind the clockspring: If the horn and airbag light fail too, see a pro.
- Act fast: Cruise issues often signal safety problems like bad brake lights.