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

P0580 Cruise Control Multi-Function Input A Circuit Low

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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. P0580 means signal line A is too low: GM at a ratio of 0–0.185 for over 2 s (short to ground or, depending on wiring, open circuit); FCA treats signal 1 below 0.216 V as circuit low. Work at the steering wheel involves the driver airbag.

Likely causes

Signal line shorted to ground (steering wheel wiring, clockspring)
Button block faulty (water, dirt)
Steering wheel or clockspring connector corroded or off
Evaluating module

Symptoms

  • Cruise control cannot be switched on, indicator missing
  • Cruise control locked out
  • No check engine light

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–450
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

P0581P0579P0564P0585P0592

References: gsi.ext.gm.com, gsi.ext.gm.com, static.nhtsa.gov.