P0580
Cruise Control Multi-Function Input A Circuit Low
Cruise / speed control
Generic OBD-II
Low
What it means
P0580 means the cruise control multi-function input 'A' circuit is reading lower than expected, usually from a short to ground or a failing switch. Cruise control may work erratically or not at all. It's a convenience-system fault that doesn't affect normal engine operation or your ability to drive the car.
Low
Can I keep driving? Fine to drive — only cruise control is affected; the engine and normal driving are unchanged.
Common symptoms
What you'll notice
- Cruise control malfunctioning or completely non-functional
- Cruise control indicator light on
- Unable to set or hold a speed
- Check-engine light on (on some vehicles)
Common causes
Most likely first
- Malfunctioning cruise control switchLikely
- Damaged or corroded wiring or connections shorting the circuit lowCommon
- Failed brake light switch (shared input on some systems)Common
- Failed cruise control moduleLess often
How to diagnose & fix
Work through it in order
- Inspect the cruise control switch wiring and connectors for a short to ground or corrosion.
- Test the multi-function switch and replace it if the 'A' input reads low or stuck.
- Check the brake light switch operation, since it feeds the cruise control on many vehicles.
- If wiring, switch, and brake switch are good, replace the cruise control module. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0580?+
Yes. Only cruise control is affected — the engine, brakes, and steering all work normally.
Can I just clear P0580?+
It will return until the low circuit fault is fixed, and cruise control won't work reliably in the meantime.
Related codes
Often seen with P0580
Read & clear P0580 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX