P0595
Cruise Control Servo Control Circuit Low
Cruise / speed control
Generic OBD-II
Low
What it means
P0595 means the ECM has detected an abnormally low voltage in the circuit that controls the cruise control servo — the actuator that holds the throttle at your set speed. With this fault the cruise control usually won't engage or hold a speed. It is a convenience-system fault and does not affect how the car otherwise drives.
Low
Can I keep driving? Fully drivable — only the cruise control is affected. Engine, brakes, and transmission are unaffected.
Common symptoms
What you'll notice
- Cruise control is inoperative
- Cruise control cannot be set or will not hold a speed
- Check-engine light on
Common causes
Most likely first
- Faulty cruise control servo (actuator)Likely
- Short to ground or open in the servo control circuitCommon
- Corroded or loose connector at the servoCommon
- Failed engine control moduleLess often
How to diagnose & fix
Work through it in order
- Scan live data to confirm the module is commanding the servo.
- Inspect the servo, its connector, and control wiring for damage or a short to ground.
- Measure the servo control circuit voltage against specification.
- Replace the cruise control servo if the circuit reads low with it commanded on.
- If the servo and wiring are good, have the ECM tested. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0595?+
Yes. Only the cruise control is affected. The engine, brakes, and transmission all work normally.
Can I just clear P0595?+
It will return while the servo circuit reads low. Repair the servo or its wiring first.
Related codes
Often seen with P0595
Read & clear P0595 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX