P0589: Cruise Control Multi-Function Input B Circuit
What to do
Driveable; cruise control will not work.
What this code means
A circuit fault on the second cruise control input. Where a design duplicates the switch inputs for cross-checking, this is the redundant half — diagnosed exactly as input A, applied to the other circuit.
Faults on both A and B together point at what they share rather than at two failures.
Likely causes
Start here
- Faulty cruise control switch · moderate
- Water ingress into connector · easy
- Corroded or loose connector · easy
Less common
- Faulty clock spring in steering wheel · specialist
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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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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