P0574 — Cruise Control/Brake Switch A Circuit High
Drive with caution — fix soon.
What P0574 means
This code appears when the computer reads a higher-than-expected voltage on the cruise control / brake switch 'A' circuit. Common causes include a faulty brake light switch, an open or broken wire, a corroded connector, or a misadjusted switch. Because the circuit often controls brake lights too, it's best fixed promptly, and the repair is usually a switch replacement or wiring repair.
Common symptoms
- Check engine light is on
- Cruise control won't engage
- Brake lights don't work or behave oddly
- Cruise control fails to disengage when braking
- Possible shift interlock issues out of Park
Common causes
- Faulty brake light switch
- Open or broken wire in the brake switch circuit
- Corroded or loose connector at the switch
- Misadjusted brake switch position
- Failing cruise control or body control module
Typical repair cost
$100 – $350
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0574 code?
Usually yes, but don't ignore it. The brake switch circuit often runs your brake lights, and a fault could leave them not working, which is unsafe. Have it looked at soon.
How much does it cost to fix a P0574 code?
Expect about $100 to $350. The brake light switch is an inexpensive part, but diagnosing an open wire or replacing a module can add to the cost.
Is a P0574 code serious?
It's moderate severity. The car remains drivable, but because the brake switch can affect brake lights and shifting, it's smart to fix it promptly for safety.
What does 'circuit high' mean in a P0574 code?
It means the computer is reading more voltage than it expects on the brake switch circuit, often from a broken wire or bad connection. The system treats it as an invalid signal and sets the code.