Cruise Control Input Circuit Low
The Powertrain Control Module (PCM) has detected that the electrical signal from the cruise control input circuit is lower than the expected voltage range. This typically occurs when there is a short to ground or a failure in the cruise control switches or wiring.
This code primarily affects the convenience of the cruise control system and does not impact the vehicle's core drivability or safety. It is safe to drive, but the cruise control will likely be disabled until repaired.
Common symptoms
- Cruise control system is completely inoperative
- Check Engine Light (MIL) is illuminated
- Cruise control indicator light fails to turn on
- Inability to set or maintain a cruising speed
- Cruise control buttons (resume, coast, cancel) do not respond
Likely causes
- Faulty cruise control multi-function switch
- Failed or damaged clockspring in the steering column
- Short to ground or open circuit in the cruise control wiring
- Corroded or loose electrical connectors in the steering column
- Blown fuse related to the cruise control system
- Faulty Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Check the cruise control system fuses
Look for: A blown fuse that would cut power to the cruise control circuit, causing a low voltage reading.
Inspect the cruise control switch and steering column wiring
Look for: Visible signs of chafing, pinched wires, or disconnected harnesses that could cause a short to ground.
Test the cruise control switch using a multimeter
Look for: Resistance or voltage readings that do not match the manufacturer's specifications when the buttons are pressed.
Test the steering wheel clockspring for continuity
Look for: An open circuit or high resistance through the clockspring ribbon cable while turning the steering wheel.
Monitor the cruise control switch inputs with a scan tool
Look for: The scan tool showing 'OFF' or 0 volts even when the cruise control buttons are actively being pressed.
This page explains the generic P0576 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.
Gear guide: Best OBD2 ScannersRead this code yourself next time — from $20 Bluetooth dongles to bidirectional scan tools.Rather have a pro handle it? Find a vetted local mechanic.