Cruise control is a convenient feature that helps maintain a steady speed on long drives, reducing fatigue and improving fuel efficiency. However, when it fails, it can be frustrating—and even dangerous—especially on highways.
In this guide, we’ll cover:
✅ Common causes of cruise control failure
✅ Immediate steps to take when it stops working
✅ How to diagnose and fix the issue
✅ When to seek professional help
By the end, you’ll know exactly how to react if your cruise control malfunctions, ensuring a safe and stress-free drive.
1. Why Did My Cruise Control Stop Working?
Before taking action, it helps to understand why cruise control fails. Common causes include:
1.1 Blown Fuse or Electrical Issue
- A faulty fuse can disable cruise control.
- Wiring problems (corrosion, loose connections) may interrupt signals.
1.2 Faulty Brake or Clutch Switch
- Cruise control disengages when you press the brake or clutch.
- A stuck or defective switch can trick the system into shutting off.
1.3 Speed Sensor Problems
- The vehicle speed sensor (VSS) sends data to cruise control.
- If it fails, the system may not engage.
1.4 Malfunctioning Control Module
- The cruise control module could be damaged.
- This often requires professional diagnostics.
1.5 Check Engine Light or Other System Errors
- Some cars disable cruise control if the check engine light is on.
- Issues like a bad throttle body or ABS failure may also affect it.
2. Immediate Steps to Take When Cruise Control Fails
If your cruise control suddenly stops working while driving, follow these steps:
Step 1: Stay Calm & Regain Manual Control
- Do not panic—your car is still fully drivable.
- Press the brake pedal gently to ensure cruise control disengages.
- Accelerate manually to maintain speed.
Step 2: Try Reactivating Cruise Control
- Turn it off and on using the steering wheel controls.
- Check if the cruise control indicator light appears.
Step 3: Check for Warning Lights
- If the check engine light is on, cruise control may be disabled.
- ABS or traction control warnings could also interfere.
Step 4: Pull Over Safely (If Needed)
- If you suspect a serious issue (like throttle problems), exit the highway safely.
- Restart the car to reset the system.
3. How to Diagnose & Fix Cruise Control Problems
3.1 Check the Fuse
- Locate the cruise control fuse (refer to your owner’s manual).
- Replace if blown.
3.2 Inspect the Brake/Clutch Switch
- If the brake lights stay on, the switch may be stuck.
- Test by pressing the pedal and checking light response.
3.3 Scan for Error Codes
- Use an OBD-II scanner to check for trouble codes.
- Common culprits: P0504 (Brake Switch Circuit) or P0571 (Cruise Control Circuit).
3.4 Test the Speed Sensor
- A failing vehicle speed sensor (VSS) can disable cruise control.
- Diagnose with a multimeter or professional scan tool.
3.5 Check the Throttle Body
- Dirty or malfunctioning throttle bodies can interfere with cruise control.
- Clean it with throttle body cleaner if needed.
4. When to See a Mechanic
While some fixes are DIY, certain issues require professional help:
Faulty cruise control module (needs reprogramming or replacement).
ABS or transmission-related errors.
Persistent electrical problems (wiring, sensors).
5. Preventing Cruise Control Failure
✅ Regularly check fuses and wiring.
✅ Test brake lights periodically.
✅ Address check engine lights immediately.
✅ Keep throttle components clean.
Conclusion
A failed cruise control system doesn’t mean your car is unsafe—just that you need to drive manually until it’s fixed. Start with simple checks (fuses, brake switch), then move to diagnostics (OBD-II scan, sensor tests). If the problem persists, a mechanic can pinpoint the issue.
Stay safe, and happy driving!
