Powertrain, generic · Vehicle speed, idle control and auxiliary inputs

P0568 Cruise Control Set Signal

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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. P0568 concerns the set button, at GM usually combined with coast. GM sets it when the button is reported pressed for over 89 s; the body module in the Saab 9-5 after an invalid voltage for 2 s.

Likely causes

Set button stuck or faulty
Moisture or wear in the steering wheel switch
Contact resistance in clockspring or steering wheel connector
Body module or cruise module

Symptoms

  • Cruise control cannot be set
  • Cruise control locked out
  • No check engine light, engine runs normally

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–400
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

cruise control switchclockspringswitch wiringbody control module

Related codes

P0567P0569P0564P0565P056C

References: gsi.ext.gm.com, gsi.ext.gm.com, saabwisonline.com.