P0575
Cruise Control Input Circuit.
- 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
- 75
- FaultThe specific fault in that area
What it means
P0575 is the SAE J2012 generic code for a fault in the cruise control input circuit. The control unit monitors the signal from the cruise control switch or command inputs and sets the code when the signal is missing, out of range, erratic or does not make sense with other inputs such as the brake switch. How the circuit is arranged and what it is tested against varies between manufacturers and models.
Symptoms
- Cruise control will not engage or set a speed
- Cruise control cancels itself unexpectedly
- Cruise control indicator light flashing or not lighting
- Warning lamp or message on the dash in some vehicles
- Steering wheel or stalk cruise buttons feel unresponsive or intermittent
- Brake lights behaving oddly if the brake switch is involved
Possible causes
- Faulty cruise control switch, stalk or steering wheel control buttons (worn or contaminated contacts)likely
- Faulty or misadjusted brake pedal switch (or clutch pedal switch on manual cars) giving a conflicting signallikely
- Damaged wiring, poor connections or corrosion in the cruise control input circuitpossible
- Worn clockspring (spiral cable) in the steering column on cars where the controls are in the steering wheelpossible
- Blown fuse or a power or earth supply problem to the switch circuitpossible
- Fault in the control unit or the module that reads the cruise inputs, or a software issue where the manufacturer has identified onerare
How to diagnose
- Read all stored and pending codes and the freeze frame data, and note whether other brake, clutch or steering control codes are present.
- Test the cruise control in each function (on, set, resume, cancel) and see whether any function is dead or intermittent.
- Check that the brake lights work properly and that the brake and clutch pedal switches are correctly adjusted and operating.
- Check the relevant fuses and inspect the switch, connectors and wiring for damage, water ingress, corrosion or chafing.
- View live data for the cruise switch and brake switch inputs, if the vehicle supports it, and check that each changes state correctly when operated.
- Measure the switch circuit supply, earth and signal voltage or resistance against the manufacturer's specification for that model.
- Wiggle-test the wiring and the steering column area while monitoring the signal, checking the clockspring if applicable.
- Only after the circuit and switches pass testing, check for manufacturer software updates or control unit faults for that model.
How to fix
- Replace the faulty cruise control switch, stalk or steering wheel control assembly.
- Replace or correctly adjust the brake or clutch pedal switch.
- Repair damaged wiring, terminals or connectors, and restore good earths and supplies.
- Replace the clockspring where testing shows it is faulty, following the manufacturer's safety procedure for airbags.
- Replace any blown fuse once the cause of the failure has been found.
- Repair or replace the control unit, or apply an updated calibration, only if testing confirms that this is the cause.
Can I keep driving?
Low severity
The car can normally be driven as usual, but cruise control may not work. If the brake lights are faulty or the brake switch is involved, get it fixed promptly because that is a safety issue.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.