6 Reasons Why Cruise Control is Not Working

(Updated on December 31, 2019)

Cruise control has been around since the late 1950s. There was a time when you could only find this convenient feature in a few model vehicles. Nowadays, it seems like virtually every model vehicle on the road has a cruise control feature.

If you normally drive long distances, especially on the interstate, then cruise control lets you rest your foot while the car maintains the same speed. This may seem like merely a luxurious feature rather than a necessity, but many people depend on it for safe driving.

If your cruise control feature malfunctions and stops working altogether, you may not think it’s an immediate concern. You’ll probably figure that you just can’t use cruise control anymore until you get the problem fixed.

However, the problem with your cruise control might be related to an acceleration issue too. In fact, there are components of cruise control which can have an adverse effect on the acceleration if those components are bad. That is why you need to be aware of what causes cruise control issues.

Common Causes of Cruise Control Not Working

There are several possible causes of cruise control not working. Below are the top 6 most common causes. Check each of these areas and see if they’re the cause of your cruise control issue. In many cases, the remedy to the problem is not that complicated or expensive.

1) Cruise Control Switch

The cruise control switch is what you use to set your cruising speed. This information is transmitted to the engine control unit and cruise control module in order to sustain the acceleration speed.

If the contacts inside the cruise control switch were to wear out, then the module and unit might not receive the necessary speed information it needs to keep the acceleration going. In response, the system will deactivate entirely and cancel the current cruise acceleration set.

2) Brake Light Switch

Normally, you press the brake pedal to turn off cruise control. The brake light switch must be detected by the cruise control system for this to happen.

If it cannot detect the switch, then cruise control will disable itself automatically until the brake light switch issue is fixed.

3) Blown Fuse

The electrical components of the cruise control system are protected by fuses. Like inside your house, it is possible to blow a fuse. This will cause the cruise control system to turn off until the fuse is replaced.

4) Check Engine Warning Light

If the check engine warning light comes on, it usually means there is a problem with your transmission or engine. Once the engine control unit detects this problem, it may disable your cruise control system in response as a safety precaution.

Until you fix the engine issue, the cruise control will stay disabled.

5) Vehicle Speed Sensor

Most vehicles have a few vehicle speed sensors to transmit speed information about the vehicle to the engine control unit and the cruise control module. The only way your cruise control module is going to know how fast the vehicle is moving is if the vehicle speed sensors feed this information to it.

If the module cannot detect the speed because of faulty speed sensors, then the cruise control system will automatically deactivate.

6) Electrical Issues

There are several electrical components connected to the cruise control system. The connectors and wiring harnesses are definitely components that you need to check when the cruise control stops working.

Make sure the source of the voltage is still supplying power to the system as well. If any of these components are loose or damaged, then it would explain why the cruise control isn’t functioning.

6 thoughts on “6 Reasons Why Cruise Control is Not Working”

  1. Mine is a mercedes benz c180, 2002 model my cruise control have just stopped working . So what are the possible causes

  2. This helped me a lot. I got more out of your 6 reasons a cruise control may not work, than when I inquired about the same situation and got nothing.
    Thank You,
    Janet M.

  3. My cruise indicator light will turn on but when I try to set the speed the light will shut off and not turn back on until I restart the engine. Any ideas what it might be?


Leave a Comment