Drive with caution — fix soon.
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.
$100 – $350
Varies by vehicle and root cause.
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.
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.
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.
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.