P0577Cruise Control Input Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- Cruise control buttons are almost always a resistor ladder on one or two signal lines, each button giving its own voltage; the module reading it (GM and Saab from about 2010: the body module; FCA: steering column module or PCM) sends the button state to the engine module over CAN. CARB names cruise control as the example of an emission-neutral diagnosis – it is simply switched off – so GM lists all these codes as type C and Ford as non-MIL: no warning lamp, the engine runs normally. P0577 means the input signal is above its upper limit – an open signal or switch ground (often in the clockspring) or a short to positive. FCA's ladder treats over 4.706 V as circuit high, with about 4.54 V at rest. No manufacturer document available to us uses this code. For line A makers use P0581.
- What you may notice
- Cruise control inoperative
- Cruise control locked out
- No check engine light, engine runs normally
- Likely causes
- LikelySignal or switch ground open (clockspring)
- PossibleSignal shorted to positive
- RareModule faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.