Cruise Control Related Malfunction
Your cruise control system isn't working properly because the ECU detected an electrical or mechanical issue in the cruise control circuit. It's like a broken autopilot—the car can't maintain your desired speed automatically.
The ECM monitors cruise control switch inputs, throttle position correlation with cruise commands, and brake pedal signal integrity. It compares actual vehicle speed against the target cruise speed and validates electrical signals from the cruise control stalk and related switches.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Cruise Control Switch Signal Voltage | 0.5–4.5V (varies by switch position) | Open circuit, short to ground, or out-of-range voltage |
| Speed Delta (actual vs. target) | Within ±2 mph of set speed | Unable to maintain speed or excessive deviation |
Code P0580 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0580 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.