P0589
Cruise Control Multi-Function Input B Circuit
Cruise control
Generic OBD-II
Low
What it means
P0589 means the cruise-control multi-function switch "B" circuit — a second speed-control switch input — is performing outside its expected range. It usually shows up as cruise control that won't set, won't hold speed, or ignores the buttons. Starting and engine operation are not affected.
Low
Can I keep driving? Safe to drive — the fault only disrupts cruise control; the engine starts and performs normally.
Common symptoms
What you'll notice
- Can't set or maintain cruise-control speed
- Cruise-control switches unresponsive
- Cruise-control or check-engine warning light on
Common causes
Most likely first
- Failed cruise-control multi-function switchLikely
- Corroded or damaged electrical connectionsCommon
- Damaged wiring in the switch circuitCommon
- Failed cruise-control or powertrain control module (PCM) — rareLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and scan for companion cruise-switch codes.
- Test the switch inputs against spec for each position.
- Inspect and repair corroded connectors and damaged wiring.
- Replace the switch if it reads out of range; clear and retest after each step.
- Replace the PCM only as a last resort.
FAQ
Quick answers
Is it safe to drive with P0589?+
Yes — only cruise control is affected. Braking, steering, and engine operation are unchanged.
Can I just clear P0589?+
It returns until the multi-function switch or its wiring is repaired.
Related codes
Often seen with P0589
Read & clear P0589 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