P0575
UniversalCruise Control Input Circuit
Low SeverityThis code indicates a problem with the electrical circuit that carries signals from your vehicle's cruise control switches to the engine computer. Essentially, the computer is not receiving the correct or expected input from the cruise control system, preventing it from activating or maintaining a set speed.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is parked on a level surface with the parking brake engaged before attempting any repairs. Disconnect the battery before working on electrical components to prevent accidental shorts or injury.
Common Symptoms
- Cruise control not engaging
- Cruise control disengaging unexpectedly
- Check Engine Light illuminated
- Intermittent cruise control functionality
Common Causes
- Faulty cruise control switch(es)
- Damaged or corroded wiring in the cruise control circuit
- Blown fuse related to the cruise control system
- Faulty clock spring (especially if steering wheel buttons are affected)
- Problems with the brake light switch (often an input to disengage cruise control)
- Less commonly, a faulty Powertrain Control Module (PCM)
Frequently reported on: General/Universal
Diagnostic Steps
- Check for any blown fuses related to the cruise control system (refer to your vehicle's owner's manual for fuse box diagrams).
- Inspect the cruise control switches for physical damage or sticky buttons.
- Visually inspect the wiring harness connecting the cruise control switches to the PCM for any signs of fraying, cuts, or corrosion.
- If accessible, use a multimeter to test the continuity and resistance of the cruise control switches according to your vehicle's service manual.
- Check the functionality of the brake light switch, as a faulty one can prevent cruise control engagement.
- Clear the code and test the cruise control function after any repairs.
👨🔧 When to Call a Professional
If after checking basic connections and fuses, the issue persists, or if you are uncomfortable testing electrical circuits with a multimeter, it is best to consult a professional mechanic for diagnosis and repair.
Commonly Asked Questions
Can I still drive my car with a P0575 code?
Yes, a P0575 code primarily affects the cruise control system and typically does not impact the vehicle's drivability or safety otherwise.
What is the most common cause of a P0575 code?
The most common causes are a faulty cruise control switch, damaged wiring, or a blown fuse in the cruise control circuit.
Is replacing the cruise control switch difficult?
Replacing the switch can range from easy to medium difficulty, depending on its location (e.g., steering wheel, dash) and how much trim needs to be removed.
Could a bad brake light switch cause a P0575?
Yes, the brake light switch is an input to the cruise control system to disengage it. If it's faulty and sending an incorrect signal, it can prevent cruise control from engaging, leading to this code.
Do I need special tools to diagnose P0575?
A basic OBD-II scanner to read and clear the code, along with a multimeter for testing electrical circuits, are the primary tools needed for diagnosis.