P0589Cruise Control Multi-Function Input B Circuit
- Generic OBD-II code · Powertrain
- How the car detects it
- Cruise control buttons form a resistor ladder on one or two signal lines, each button giving its own voltage window. FCA uses two lines with offset windows – signal 1 is input A, signal 2 input B – and both must report the same button; GM evaluates the ratio to the reference. Any fault locks out cruise control; CARB treats this as emission-neutral, and GM and Ford set these codes without warning lamp. P0589 is the general fault of the second button input B. GM uses it only for one engine variant (LGW): the ratio lies in a gap between valid button windows for over 0.5 s. It is the counterpart of P0564 for input A.
- What you may notice
- Cruise or distance control unavailable
- Cruise control locked out
- No check engine light
- Likely causes
- LikelyIncreased contact resistance shifting button voltages
- PossibleButton block aged or damp
- PossibleClockspring faulty
- RareModule input
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.