Code
P0586
Generic
P — Powertrain
Cruise Control Vent Control Circuit/Open
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the vent control circuit
- Disconnected, corroded or damaged connector/pins at the vent solenoid or PCM
- Failed vent control solenoid/actuator
- Blown fuse or faulty relay feeding the vent circuit
- Poor ground or power supply to the circuit
- PCM/ECM output driver fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) or Check Engine Light illuminated
- Cruise control disabled or unavailable
- Vehicle may not hold set speed under light load
- No audible or visible operation from vent/solenoid when cruise is commanded
- Possible related diagnostic trouble codes stored
What to check
- Read DTCs and freeze frame with a scan tool; note conditions when code set
- Attempt to actuate cruise vent/solenoid from a capable scan tool and observe response
- Visually inspect wiring and connectors for damage, corrosion, or disconnection
- Check fuses and relays related to cruise control circuits
- Backprobe connector at vent solenoid to confirm presence of expected voltage/ground when commanded
- Measure resistance of vent solenoid and compare to manufacturer spec (typical is low ohms)
Signal parameters
- Control type: On/Off command from PCM or PWM to vent solenoid/actuator
- Expected behavior: circuit provides either switched battery voltage or switched ground when commanded; solenoid should energize
- When circuit is open: no voltage/ground change at solenoid when commanded
- Solenoid coil resistance: typically low (tens of ohms) — compare to OEM spec
- Scan-tool command should show state change or result when actuating the vent control
Diagnostic algorithm
- Retrieve freeze frame and related codes. Clear codes and attempt to reproduce P0586 while monitoring live data.
- Visually inspect the vent solenoid/actuator, associated vacuum lines, harness, and connectors for damage, corrosion, or disconnection.
- Locate fuse(s) and relay(s) for cruise control/vent circuit; verify continuity and proper operation. Replace any blown fuses.
- With ignition on (engine off) and using a DVOM, backprobe the vent solenoid connector. Command the PCM to actuate the vent via scan tool and observe for battery voltage or switched ground at the connector.
- If no command signal is present at the solenoid connector, check continuity from the PCM output pin to the solenoid pin. Repair any open circuit found (splice, connector, harness).
- Measure the solenoid coil resistance. If open or out of spec, replace the vent solenoid/actuator.
- If continuity and solenoid are good but no command is present at the PCM output, inspect PCM connector pins for corrosion/damage and verify ground and power supply circuits to the PCM. Consider PCM driver failure if internal output is open.
- After repairs, clear codes and retest under same conditions to confirm the fault does not return. Road test and verify cruise function.
Likely causes
- Wiring harness damage (chafing, broken wire) between PCM and vent solenoid
- Loose or corroded connector at the vent solenoid
- Failed/cracked vent control solenoid
- Blown fuse supplying the vent circuit
- Poor ground at chassis or PCM connector
Fault status
Status
Cruise Control Vent Control Circuit Open — PCM detects open circuit in vent/actuator control circuit. Cruise control unavailable; MIL on.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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