P056CCruise Control Cancel Signal
- 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. P056C concerns the cancel button, which interrupts control but keeps the set speed – unlike the off signal P0566. GM (from about 2015) sets it when the button is reported pressed for over 20 s. Older code lists still show it as reserved.
- What you may notice
- Cruise control cannot be engaged or cancels immediately
- Cruise control locked out
- No check engine light, engine runs normally
- Likely causes
- LikelyCancel button stuck or faulty
- PossibleMoisture or wear in the steering wheel switch
- PossibleContact resistance in clockspring or steering wheel connector
- RareBody module or cruise module
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.