P0595 Cruise Control Servo Control Circuit Low

P0595 points to a low condition in the cruise control servo control circuit. The servo control voltage, current, or feedback is below the expected range.

Code details

Generic OBD-II · P0

System: Speed / Idle
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the cruise actuator before confirming power, ground, driver control, and actuator load.

Symptoms of P0595

Unstable, high, or low idle, or stalling.
Erratic speedometer, cruise-control, or shift behaviour.
Check-engine light with a hesitation or surge.

Common causes of P0595

A dirty throttle body, idle-control valve, or throttle-position sensor.
A failing vehicle-speed or wheel-speed sensor, or its wiring.
Vacuum leaks or a related sensor forcing the idle/speed strategy.

Useful checks before replacing parts

Check servo command, control voltage, current draw, fuse feed, ground or driver control, cruise enable data, and freeze-frame conditions.
Inspect for short-to-ground faults, open power feed, failed actuator windings, connector corrosion, harness damage, and linkage binding.
Command the servo and verify both electrical response and actual throttle, cable, or actuator movement.

Related OBD-II codes

These nearby speed / idle entries can help compare wording and pin down the fault area.