P0580Cruise Control Multi-Function Input A Circuit Low
- 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. P0580 means signal line A is too low: GM at a ratio of 0–0.185 for over 2 s (short to ground or, depending on wiring, open circuit); FCA treats signal 1 below 0.216 V as circuit low. Work at the steering wheel involves the driver airbag.
- What you may notice
- Cruise control cannot be switched on, indicator missing
- Cruise control locked out
- No check engine light
- Likely causes
- LikelySignal line shorted to ground (steering wheel wiring, clockspring)
- PossibleButton block faulty (water, dirt)
- PossibleSteering wheel or clockspring connector corroded or off
- RareEvaluating module
- 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.