Cruise Control Input Circuit Malfunction
The P0575 code indicates a problem in the cruise control input circuit, which typically involves the brake switch, clutch switch, or the cruise control module. The Powertrain Control Module (PCM) detects an incorrect voltage signal from the cruise control input circuit, preventing the system from engaging or maintaining set speed. This can be caused by a faulty brake light switch, wiring issues, or a defective cruise control module.
1. Most Common Causes
- Faulty brake light switch
- Damaged wiring or connectors in the cruise control circuit
- Defective cruise control module
- Blown fuse for cruise control system
2. Symptoms You Will Notice
- Cruise control does not engage or disengages unexpectedly
- Brake lights may not work properly
- Check Engine Light illuminated
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P0575 and check for additional codes.
Step 2: Inspect the brake light switch for proper operation and adjustment.
Step 3: Check the cruise control fuse and relay for continuity.
Step 4: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 5: Test the cruise control module per manufacturer specifications.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but cruise control will not work. If the brake lights are also affected, it may be unsafe as other drivers may not see your braking.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, but could be higher if the cruise control module needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.