P0594
Cruise Control Servo Control Circuit Open
The servo motor that drives the cruise control throttle actuator has an open control circuit. The ECU cannot drive the servo - cruise control is unavailable.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Open in motor or harnessCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Cruise Control Servo
P0594 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.