P0579 Code: Cruise Control Multi-Function Input “A” Circuit/Range Performance
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.
What Does the P0579 Code Mean?
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.
What are the Common Causes of the P0579 Code?
- Cruise control master switch failure
- Control module failure
- Clock spring failure
- Wiring issues
What are the Common Symptoms of the P0579 Code?
- Illuminated check engine light
- Inoperative cruise control
- Cruise control light might be illuminated
How to Diagnose the P0579 Code
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:
How to Fix the P0579 Code
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.
The post P0579 Code: Cruise Control Multi-Function Input “A” Circuit/Range Performance appeared first on In The Garage with CarParts.com.
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