P056BCruise Control Decrease Distance 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. P056B exists only with adaptive cruise control: the button to decrease following distance is stuck or invalid; counterpart of P056A. FCA's switch reads the distance button over the same ladder as the others. No manufacturer document available to us uses this code.
- What you may notice
- Following distance cannot be decreased
- Cruise control locked out
- No check engine light, engine runs normally
- Likely causes
- LikelyDistance 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 – €450
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.