P0579 code — how to fix error fast
Decoding the P0579 code is pivotal for your car's upkeep. Learn its importance and how to react.
While not all the OBD2 codes are that serious for your car’s engine, those like the code P0579 can, either way, compromise your driving experience. If the code appears, you likely won’t be able to use the cruise control system and that could even lead to other consequences.
So, our team made this guide on the P0579 code meaning and its main causes to help you cope with the issue. Through this guide, we’ll explain all the potential reasons behind the code so you can move on and diagnose the right one and repair it promptly.
Why you can trust REREV’s OBD2 code advice: Our automotive expert researchers with experienced mechanics undertakes a thorough research methodology to deliver precise insights on OBD codes. Find out more about OBD2 codes research process..
What does the P0579 code mean?
The P0579 code relates to the cruise control system, which is responsible for maintaining a set speed while driving. When this code is triggered, it means that there is a problem with the cruise control system. This could be due to a malfunctioning brake switch, which prevents the cruise control from engaging when the brakes are applied.
The consequences of the P0579 code can be serious, as the cruise control system is an important safety feature. If your vehicle is unable to maintain a set speed while driving, it can be difficult to keep the vehicle under control, especially on long trips.
Symptoms of the code can include the cruise control not working at all, or the cruise control turning off unexpectedly while driving.
What causes the P0579 code?
There are several potential causes of the code and they mostly have to do with one of the key factors of the cruise control system. Let’s explain each one of these to give you a better idea on what might have caused the code in your car:
Malfunctioning Brake Switch
As mentioned earlier, the most common cause of the P0579 code is a malfunctioning brake switch. This switch is responsible for telling the cruise control system when the brakes have been applied, which in turn disengages the cruise control. If the brake switch is malfunctioning, it can prevent the cruise control from engaging at all.
Another potential cause of the P0579 code is wiring issues within the cruise control system. This can include damaged or corroded wiring, which prevents the system from receiving the signals it needs to operate properly.
Faulty cruise control module
The cruise control module is a key component of the cruise control system, and if it’s faulty, it can cause the P0579 code to be triggered. This can happen if the module is damaged or has failed due to wear and tear.
Failed brake pedal position sensor
Finally, a failed brake pedal position sensor can also cause the code to be triggered. This sensor is responsible for telling the vehicle’s computer when the brake pedal is depressed, which in turn disengages the cruise control. If the sensor has failed, the cruise control system may not work properly.
Which car models does the P0579 code affect the most?
The P0579 code can affect any car that has a cruise control system, but there are some models that are more susceptible to this code than others. Some of the most commonly affected models include:
- Chevy Silverado: Problems with the brake switch and the pedal position sensor have made this vehicle more prone to the code than others.
- Ford F-150: Due to electrical issues and wiring, the F-150 is among the most exposed vehicles to this code.
- Jeep Wrangler: Jeep Wrangler with a V6 engine is also exposed to problems with the brake switch circuit.
How to diagnose the P0579 code
Diagnosing the P0579 code can be a bit tricky, as there are several potential causes. However, there are some steps you can take to diagnose the issue.
Use an OBD2 scanner
The first step in diagnosing the code is to use a scan tool to read it. This tool will give you more information about the code and may help you identify the cause more quickly.
Inspect the brake switch
One of the most common causes of the P0579 code is a malfunctioning brake switch. To check this, you’ll need to inspect the switch to see if it’s working properly. This can be done using a multimeter to test the switch’s continuity.
Check the wiring
If the brake switch appears to be working properly, you’ll need to check the wiring within the cruise control system. This can be done by inspecting the wiring for damage or corrosion and testing the wires using a multimeter.
Inspect the cruise control module
If the wiring appears to be working properly, you’ll need to inspect the cruise control module itself. This can be done by removing the module and inspecting it for damage or wear.
How to fix the P0579 code
Once you’ve diagnosed the cause of the P0579 code, you can begin to fix the issue. There are several potential fixes for each cause of the code.
Replace the brake switch
If the brake switch is the cause of the code, it will need to be replaced. This is a relatively simple fix that can be done by a professional mechanic.
Repair or replace wiring
If the wiring within the cruise control system is damaged or corroded, it will need to be repaired or replaced. This can be a bit more complex, but a professional mechanic should be able to handle the job.
Replace the cruise control module
If the cruise control module is faulty, it will need to be replaced. This can be a bit more expensive than other fixes, but it’s necessary to ensure that the cruise control system works properly.
Replace the brake pedal position sensor
Finally, if the brake pedal position sensor is the cause of the code, it will need to be replaced. This is a relatively simple fix that can be done by a professional mechanic.
How to prevent the P0579 code
Preventing the P0579 code is largely a matter of proper maintenance. This includes:
- Regularly inspecting the brake switch and wiring within the cruise control system
- Performing routine maintenance on the cruise control system, such as cleaning and lubricating components
- Having your vehicle serviced by a professional mechanic on a regular basis
By following these tips, you can help prevent the code from occurring and ensure that your vehicle’s cruise control system works properly.
The P0579 code can be a frustrating issue to deal with, but with the right knowledge and tools, it can be diagnosed and fixed relatively easily. By understanding what causes the code and how to fix it, you can keep your vehicle’s cruise control system working properly and ensure that you’re always in control while driving.
How do I know if my car has a problem with the cruise control brake switch A circuit?
If your car’s cruise control system is not functioning properly or if you notice that it continues to operate even after you apply the brakes, it may be a sign that there is an issue with the cruise control brake switch A circuit. You may also see the check engine light come on and receive a diagnostic trouble code (DTC) such as P0579.
Is it safe to drive with the code P0579?
It is not recommended to drive with the P0579 code as it may cause safety concerns. If your car’s cruise control system is not functioning properly, it may lead to unintended acceleration or difficulty slowing down the vehicle.
How is the code P0579 diagnosed and repaired?
Diagnosis of the P0579 code typically involves a visual inspection of the brake switch and its wiring, followed by testing of the brake switch using a multimeter. If a fault is found, replacement of the faulty component may be necessary. In some cases, reprogramming of the vehicle’s onboard computer may also be required.