Cruise Control Input Circuit
The Powertrain Control Module (PCM) has detected an abnormal voltage or resistance reading within the cruise control input circuit. This indicates that the signals sent from the driver-operated cruise control switches are not being received correctly by the vehicle's computer.
This code primarily affects the convenience feature of cruise control and does not impact the vehicle's core drivability or safety. It is safe to drive, but the cruise control system will likely be disabled until repaired.
Common symptoms
- Cruise control system is completely inoperative
- Cruise control indicator light fails to illuminate on the dash
- Cruise control fails to set or hold a specific speed
- Cruise control disengages unexpectedly while driving
- Check Engine Light illuminates
Likely causes
- Faulty cruise control switch
- Failed steering wheel clock spring (for steering wheel mounted controls)
- Damaged, shorted, or open wiring in the cruise control circuit
- Blown fuse in the cruise control system
- Corroded or loose electrical connectors at the switch or module
- Faulty cruise control module or PCM (rare)
What to check before replacing parts
Check the cruise control system fuses
Look for: A blown fuse, which indicates a short circuit or overload in the system that needs to be addressed.
Use a scan tool to monitor cruise control switch data PIDs
Look for: Verify if the PCM registers the switch states (ON, OFF, SET, RESUME) when the buttons are pressed; no change indicates a switch, clock spring, or wiring issue.
Inspect the wiring and connectors at the steering column and cruise control switch
Look for: Signs of chafing, broken wires, loose pins, or corrosion that could interrupt the circuit.
Test the steering wheel clock spring for continuity
Look for: High resistance or an open circuit through the clock spring ribbon while turning the steering wheel, indicating a broken internal connection.
Test the cruise control switch with a multimeter
Look for: Incorrect resistance values or lack of continuity when the switch buttons are pressed, confirming the switch itself has failed internally.
This page explains the generic P0575 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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