Fault code P0579 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0579 – Cruise Control Related Malfunction

P0579: Causes, signs and repairs

Error code P0579 is displayed and the check engine light is on - what does this mean?

The OBD system detects a fault in the cruise control system (cruise control), specifically a fault in the cruise control switch "A" circuit. This DTC P0579 affects the electronic stability control system and the cruise control of the vehicle.

What can cause this fault code?

Defective cruise control switch on the steering wheel
Damaged cable connection to the cruise control switch
Corroded or loose plug connections in the circuit
Defective cruise control control module
Short circuit or interruption in the wiring
Faulty spiral cable unit in the steering wheel
Faulty fuse in the cruise control system

What symptoms occur in parallel with fault code P0579?

Function failure: Cruise control cannot be activated or works unreliably
Switch problems: Cruise control buttons do not respond or respond intermittently
Indicator lights: Check engine light illuminates continuously
System fault: Cruise control display in the dashboard does not work
Electronic faults: Other steering wheel functions may be impaired

How to fix the problem of fault code P0579?

Repairing fault code P0579 requires a systematic diagnosis of the cruise control system.
Replacement of the defective cruise control switch on the steering wheel, including programming and calibration of the new component
Repair or replacement of damaged cable connections between switch and control unit with subsequent function test
Cleaning and securing all plug connections in the cruise control circuit and checking the contact resistances
Complete replacement of the cruise control control module with reprogramming of the vehicle parameters
Replacement of the spiral cable unit in the steering wheel if the rotating connection is damaged
Checking and replacing defective fuses and checking the entire system power supply

FAQ - Frequently asked questions about DTC P0579

Can I continue driving with fault code P0579?

Yes, the vehicle can still be driven as only the cruise control system is affected. The engine and other important systems will function normally, but you should have the fault rectified as soon as possible.

How much does it cost to repair error code P0579?

The repair costs vary between 80-400 euros, depending on the cause. A simple switch replacement costs around 80-150 euros, while replacing the control module can cost 200-400 euros.

How can I diagnose fault code P0579 myself?

First check all fuses of the cruise control system and test the functionality of the cruise control switches on the steering wheel. An OBD scanner shows additional information on the source of the fault.

Does trouble code P0579 occur more frequently under certain driving conditions?

The error can occur in all driving conditions, but is often only noticed when attempting to activate cruise control. Humidity and temperature fluctuations can exacerbate electronic problems.

Can error code P0579 be rectified by software updates?

In rare cases, a software update of the control unit can help, but usually a hardware replacement is necessary. A professional diagnosis will clarify the exact cause.

How do I prevent the EOBD code P0579 from reoccurring?

Regular maintenance of the electronic systems, protection against moisture and careful handling of the steering wheel switches reduce the risk of recurring problems.

Vehicles in which error code P0579 occurs most frequently

Error code P0579 is a standardized OBD-II code for cruise control problems and can occur in various vehicle brands, but is most common in the following vehicles:

Ford: Focus, Fiesta, Mondeo, Kuga (2008-2018)
Opel: Astra, Corsa, Insignia, Zafira (2009-2019)
Volkswagen: Golf, Passat, Tiguan, Polo (2010-2020)
BMW: 3 Series, 5 Series, X3, X5 (2008-2017)
Mercedes-Benz: C-Class, E-Class, A-Class, GLC (2009-2018)
Audi: A3, A4, A6, Q5 (2008-2019)
Peugeot: 308, 508, 3008, 2008 (2010-2020)
Renault: Megane, Scenic, Kadjar, Clio (2009-2018)
Nissan: Qashqai, X-Trail, Micra, Juke (2008-2019)
Toyota: Avensis, RAV4, Yaris, Auris (2009-2017)

If code P0579 occurs in your vehicle, a prompt diagnosis is recommended, even if the vehicle remains drivable. The repair should be carried out by a qualified workshop, as modern cruise control systems contain complex electronic components that require special diagnostic equipment and specialist knowledge.

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