P0585Cruise Control Multi-Function Input A/B Correlation
- 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. P0585 means inputs A and B contradict each other although both voltages are valid – one reports a button, the other rest or another button. Documented only by FCA: a 2022 bulletin traces it to a SET+ button stuck by a badly seated trim, another names oxidised steering wheel contacts. FCA gives no thresholds; GM does not use P0585.
- What you may notice
- Cruise control not engaging or cutting out, button sticking
- Cruise control locked out
- No check engine light
- Likely causes
- LikelyButton stuck mechanically (trim, dirt)
- PossibleIncreased contact resistance on one line (clockspring or column module connector)
- PossibleButton block faulty internally
- RareClockspring faulty
- Repair
- Easy · Usually a job for a workshop.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.