P0585

Cruise Control Multi-Function Input A/B Correlation

Q: 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.

Q: Can I just clear P0585?

It will return as soon as the two switch inputs disagree again. Fix the switch or wiring first.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0585 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX