P0585
Cruise Control Multi-Function Input A/B Correlation
Cruise / speed control
Generic OBD-II
Low
What it means
P0585 means the two signals from the cruise control multi-function switch (input A and input B) do not agree with each other. Because the module can't trust a mismatched input, it disables cruise control. This is a convenience-system fault — it has no effect on the engine, brakes, or transmission.
Low
Can I keep driving? Fully drivable — only the cruise control is affected. Engine, brakes, and transmission are unaffected.
Common symptoms
What you'll notice
- Check-engine light on
- Cruise control will not set or hold a speed
- Cruise switches respond erratically or not at all
Common causes
Most likely first
- Failed cruise control multi-function switchLikely
- Corroded or damaged connectors in the switch circuitCommon
- Worn clock spring (for steering-wheel-mounted switches)Common
- Failed cruise control or powertrain control moduleLess often
How to diagnose & fix
Work through it in order
- Scan live data and compare the A and B switch inputs — the code sets when they disagree.
- Test the multi-function cruise switch for correct A/B signals on each button.
- Inspect the switch wiring and connectors for corrosion or damage.
- Check the clock spring if the switches are steering-wheel-mounted.
- Replace the switch, then the module, if the two signals stay out of agreement. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0585?+
Yes. This is a cruise control fault — the two switch signals disagree — and it does not affect how the car drives or stops.
Can I just clear P0585?+
It will return as soon as the two switch inputs disagree again. Fix the switch or wiring first.
Related codes
Often seen with P0585
Read & clear P0585 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