An activated cruise control system lets the vehicle maintain a preset speed until the driver steps on the gas pedal or brake pedal. In most cases, the system monitors the speed sensors and sends the information to the powertrain control module (PCM) for speed reference. If the PCM detects a problem with the cruise control system, on-board diagnostics will log a P0579 trouble code.
Diagnostic trouble code (DTC) P0579 stands for “Cruise Control Multi-Function Input ‘A’ Circuit/Range Performance.”
In a typical system, the throttle position (TP) sensor sends a signal to the cruise control module. If the cruise control system is computer-controlled, a servo unit or an electronic throttle body are used for throttle control and control switches for driver control of functions. Vehicle speed sensors and electrical brake pedal release switches are also used.
Most cruise control systems can only be used at speeds above 25 to 30 mph. In most cases, the system won’t activate unless you drive faster than the minimum speed requirement.
Note: The definition of code P0579 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
Although DTC P0579 is a generic powertrain code that can be logged in vehicles with an OBD-II system, the steps for diagnosis and repair can vary depending on vehicle specifications. Diagnosing this trouble code usually involves using a scan tool and inspecting the affected system for signs of damage or shorted wiring, which can be tricky if you’re new to auto repair. To get the best results, it’s a good idea to bring your vehicle to a certified technician.
If you think you can handle this task on your own, here’s a short video you can watch to get an idea of what the process might involve:
Without the right tools and information, attempting to fix a P0579 code can be frustrating and confusing. It can even lead to further complications if done incorrectly. If you think you don’t have the skills and advanced technical knowledge to resolve this code on your own, you can always have a trained professional perform the necessary repairs for you.
Remember that there’s no single fix for the same code across different makes and models. So before tinkering with your vehicle, make sure to check out repair guides like those from Chilton or refer to an ALLDATA subscription to get vehicle-specific repair information.
If your vehicle logged a P0579 code due to a bad cruise control master switch, don’t put off replacing it. For a top-notch replacement that won’t break the bank, shop here at CarParts.com.
Our auto parts are carefully selected by a team of professionals to guarantee both quality and longevity. You won’t have to worry about the new replacement cruise control master switch failing you any time soon.
The best part? You don’t even have to take one step outside your door to get your hands on a new switch. Enter your ride’s year, make, and model into our vehicle selector to view compatible cruise control master switches. Then, narrow the results to the ones that match your preferred brand and price with the search filters.
In addition, you won’t have to wait too long to receive your order. Our warehouses are strategically located all over the US, so you can expect to receive any of your orders within two business days.
Don’t leave DTC P0579 unaddressed for too long. Order a replacement cruise control master switch now at CarParts.com.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.