P0587 OBD II Trouble Code Cruise Control Vent Control Circuit Low

• If the code is stored in the PCM, there is highly probable that the vehicle control speed won't be set when using your cruise control
• Check/service engine soon warning lamp on the dashboard may be illuminated (in some cases, the issue must be identified three time by the ECM before the warning light will come on)
• Blown fuses are likely to be present in some cases
• One or more cruise control functions not working
• Irregular/Intermittent general cruise control functionality

• Problematic or malfunctioning cruise control switch
• Poor electrical connection in speed control/vent control solenoid
• Speed control/vent control harness is open or a short circuit is present
• Vacuum leak or obstruction within cruise control system
• Damaged or corroded connectors
• Defective vent control solenoid
• Blown fuses (may be a result of underlying electrical issue in cruise control vent control circuit)

Severity for this problem is low because you can still drive your car even if it's experiencing the P0587 trouble code. However, it is very likely that your car's cruise control system isn't actively working. It is advisable that you address this issue as soon as you can, especially if you frequently rely on your car's cruise control system. This is to prevent the issue from getting worse and to stop it from causing other related problems.