P0574
Cruise Control System Vehicle Speed Too High
The cruise control sees actual vehicle speed exceed the set-speed by more than the diagnostic margin (typically going downhill or with throttle override). Persistent oversize means the system cannot bring speed down - either an actuator fault, brake-blending failure, or driver kick-down stuck.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Cruise servo stuck driving throttleCommon
Parts involved
- Cruise Control Servo
- Brake Blending
P0574 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.