Worn or faulty cruise control switch or stalk with internal short or high resistance to earth; Chafed or damaged wiring shorted to earth in the switch circuit, often in the steering column or clockspring area; Corroded or loose connector at the switch or control unit pulling the signal low; Worn clockspring (spiral cable) on steering wheel mounted controls; Moisture or spilled liquid contamination in the switch assembly; Fault in the control unit input circuit or a software issue.

P0580

Cruise Control Multi-Function Input A Circuit Low.

Generic
Powertrain
Generic code
Low severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
5: AreaVehicle speed, idle control and auxiliary inputs
80: FaultThe specific fault in that area

What it means

P0580 is the generic code for a low voltage condition in the Cruise Control Multi-Function Input A circuit. The control unit monitors the signal from the cruise control switch or stalk and sets the code when the voltage falls below the expected range, which points to a short to earth, a faulty switch or a wiring fault. The exact switch layout and signal values vary by model, so the vehicle-specific wiring data should be used.

Symptoms

Cruise control will not engage or set a speed
Cruise control cancels itself unexpectedly
Cruise control buttons or stalk respond intermittently or not at all
Cruise control warning or malfunction light on the dash
Engine management light illuminated
Other steering wheel or stalk functions behaving oddly on some models

Possible causes

Worn or faulty cruise control switch or stalk with internal short or high resistance to earthlikely
Chafed or damaged wiring shorted to earth in the switch circuit, often in the steering column or clockspring arealikely
Corroded or loose connector at the switch or control unit pulling the signal lowpossible
Worn clockspring (spiral cable) on steering wheel mounted controlspossible
Moisture or spilled liquid contamination in the switch assemblypossible
Fault in the control unit input circuit or a software issuerare

How to diagnose

Read all stored and pending codes and note the freeze frame data, then check for related codes in other modules
Check the cruise control fuse and inspect the switch, stalk and surrounding trim for damage, wear or liquid ingress
Inspect the wiring and connectors at the switch, steering column and control unit for chafing, corrosion and pushed-back pins
With a scan tool, watch the switch input status while operating each button and see whether it responds correctly or sticks
Using the manufacturer wiring diagram, measure the reference voltage and signal voltage at the switch connector with the switch in each position
Check the signal wire for a short to earth and the circuit resistance with the battery disconnected and the connector unplugged
Check the clockspring continuity and resistance for the cruise circuit where fitted
Clear the code and road test to confirm whether it returns once the fault is repaired

How to fix

Replace the faulty cruise control switch or stalk
Repair or replace damaged wiring to remove the short to earth
Clean or replace corroded connectors and terminals
Replace the clockspring if testing shows it is faulty
Dry out and clean or replace a switch contaminated by liquid
Replace or reprogram the control unit only after the wiring and switch have been proven good and the manufacturer confirms a fault

Can I keep driving?

Low severity

The car can normally be driven as usual, only without cruise control. Book it in for repair at your convenience, but have it checked sooner if other steering wheel controls or warning lights are affected.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.