P0585: Cruise Control Multi-Function Input A/B Correlation
What to do
Driveable; cruise control will be disabled, which is deliberate. Because two circuits are involved, look for what they have in common rather than assuming two faults.
What this code means
The two cruise control input circuits disagree. Safety-relevant switches are commonly duplicated so that a module can detect a failure rather than act on a single unverified input — the same principle as the redundant brake switch — and a correlation fault means that cross-check has failed.
The module's response is to disable cruise control entirely, which is the intended behaviour. Two independent circuits failing at the same moment is unlikely, so suspect what they share: a common ground, a common supply, the clock spring, or water in a connector carrying both.
Likely causes
Start here
- Water ingress into connector · easy
- Faulty cruise control switch · moderate
- Faulty clock spring in steering wheel · specialist
Less common
- Corroded switch contacts · easy
- Open sensor ground circuit · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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