P0581
Cruise Control Multi-Function Input A Circuit High
Cruise control
Generic OBD-II
Low
What it means
P0581 means the cruise control switch's "A" input is reading higher voltage than expected, usually from a stuck switch or a wire shorted to power. It only affects the cruise control system — the engine, brakes, and transmission run normally. It's a low-urgency fix, most often the switch or its wiring rather than a module.
Low
Can I keep driving? Drivable — the engine runs normally; only the cruise control is affected, so there's no rush beyond wanting cruise back.
Common symptoms
What you'll notice
- Cruise control won't engage or behaves erratically
- Cruise control buttons unresponsive
- Check-engine light on
Common causes
Most likely first
- Faulty cruise control multi-function switch (stuck or shorted high)Likely
- Wiring shorted to voltage in the switch input circuitCommon
- Loose or corroded connector at the switch or steering-wheel/clockspring contactCommon
- Faulty cruise control or powertrain control module, rareLess often
How to diagnose & fix
Work through it in order
- Confirm the fault is cruise-only, then inspect the cruise switch and its connector.
- Measure the input-A signal voltage — a constant high reading points to a short to voltage or a stuck switch.
- Check the wiring and, on steering-wheel switches, the clockspring for damage.
- Replace the cruise control switch if it tests faulty.
- Clear the code and test cruise operation on a road test.
FAQ
Quick answers
Is it safe to drive with P0581?+
Yes. The engine, brakes, and transmission are unaffected — you just may not have working cruise control until it's repaired.
Can I just clear P0581?+
You can, but it returns whenever the switch reads high again. Fixing the switch or its wiring is the real remedy.
Related codes
Often seen with P0581
Read & clear P0581 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