P0587 Cruise Control Vent Control Circuit Low

P0587 points to a low condition in the cruise control vent control circuit. The vent solenoid circuit is reading 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 cruise switches before confirming the low vent-control circuit fault.

Symptoms of P0587

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 P0587

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 vent solenoid command, control voltage, current draw, fuse feed, ground or driver control, and freeze-frame cruise data.
Inspect for short-to-ground faults, open power feed, failed solenoid windings, connector corrosion, damaged wiring, and weak grounds.
Command the vent solenoid and verify both electrical response and vacuum release behavior.

Related OBD-II codes

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