Faulty cruise control multi-function switch (stalk or steering wheel buttons); Short to ground in the signal wire between the switch and PCM; Corroded or damaged electrical connector at the switch or PCM; Clockspring (spiral cable) internal short or wear; PCM internal fault (rare); Aftermarket accessories tapped into the cruise circuit causing a short

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P0580

P0580Cruise Control Multi-Function Input 'A' Circuit Low

Q: What does code P0580 mean?

Cruise Control Multi-Function Input 'A' Circuit Low. P0580 indicates that the cruise control multi-function input 'A' circuit has been detected as low by the powertrain control module (PCM), meaning the signal voltage on that circuit is below the expected range. The PCM monitors this input from the cruise control switch or stalk and sets the code when the voltage stays low for a calibrated time, often indicating a short to ground or a faulty switch.

P0580 indicates that the cruise control multi-function input 'A' circuit has been detected as low by the powertrain control module (PCM), meaning the signal voltage on that circuit is below the expected range. The PCM monitors this input from the cruise control switch or stalk and sets the code when the voltage stays low for a calibrated time, often indicating a short to ground or a faulty switch.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Cruise control does not engage or cancels unexpectedly
Cruise control indicator light may flash or stay off
Steering wheel-mounted cruise buttons may be unresponsive
Often no symptoms besides the warning light
Other steering wheel controls (horn, audio) may also malfunction if on a shared circuit

Common causes, most likely first

Faulty cruise control multi-function switch (stalk or steering wheel buttons)
Short to ground in the signal wire between the switch and PCM
Corroded or damaged electrical connector at the switch or PCM
Clockspring (spiral cable) internal short or wear
PCM internal fault (rare)
Aftermarket accessories tapped into the cruise circuit causing a short

How to diagnose and fix it

Inspect the cruise control switch and connectors for corrosion, damage, or loose pins
Check the clockspring for continuity and signs of wear, especially if other steering wheel controls fail
Disconnect the switch and measure resistance across the switch terminals while pressing each button; compare to manufacturer specifications
Measure voltage on the signal wire at the PCM connector with the switch disconnected; a constant low voltage indicates a short to ground
Trace the signal wire from the switch to the PCM for chafing, pinches, or shorts to ground
If the wire and switch test good, substitute a known-good PCM or reprogram as needed
Clear codes and verify cruise control operation with a scan tool

Don't overlook the clockspring

A shorted clockspring often causes P0580 along with other steering wheel control faults, so test it before replacing the cruise switch.
The code can set intermittently due to a wire rubbed through near the steering column or under the dash, so wiggle-test the harness while monitoring live data.
Aftermarket alarm or remote start installations frequently tap into the cruise circuit and create a low-voltage condition that mimics a failed switch.
Some vehicles use a resistor ladder network in the cruise switch; a single faulty resistor can pull the entire signal low and set P0580.
P0580 does not always mean the switch is bad; a poor ground at the PCM or a low battery voltage can also trigger it.

Can I keep driving with P0580?

The vehicle remains safe to drive because cruise control is a convenience feature, but avoid using cruise control until the fault is repaired to prevent unexpected cancellation or unintended acceleration.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.