P0592Cruise Control Multi-Function Input B 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. P0592 means signal line B is too low: GM (engine variant LGW) at a ratio of 0–0.185 for over 2 s, a short to ground or open circuit; FCA treats signal 2 below 0.784 V as circuit low.
- What you may notice
- Cruise control and distance or mode buttons inoperative
- Cruise control locked out
- No check engine light
- Likely causes
- LikelyLine B shorted to ground (steering wheel, clockspring)
- PossibleButton block faulty or damp
- PossibleCorroded connector
- RareModule
- 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.