P0594

Cruise Control Servo Control Circuit/Open

Severity

✅ Low

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$33–167 (est.)

Symptoms

Cruise control doesn't work at all
Check Engine Light Illuminates
No response to cruise control activation
Cruise control indicator may turn on but speed is not maintained

Causes

Broken wire in the servo control circuit
Malfunction (winding break) of the actuator/servo drive
Oxidation or damage to the servo connector
Faulty servo relay or fuse
Internal malfunction of the cruise control ECU

How to Fix

Find the location of the cruise control servo according to the car diagram
Check servo circuit fuse
Measure the resistance of the actuator winding (standard: 20–100 Ohms depending on the type)
Check the wires and connector for breaks and oxidation
Check the presence of a control signal from the computer when activating cruise control
Replace the servo or repair the wiring if a fault is detected

Related codes

P0595 P0596 P0597 P0587 P0588