Technical Description of OBD-II Trouble Code
The circuit for controlling the vent in the cruise control system is experiencing low voltage.
What does that mean?
This is a generic diagnostic trouble code (DTC) that applies to OBD-II vehicles, including but not limited to Dodge, Jeep, Honda, Chrysler, Ram, Hyundai, Chevrolet, etc.
Cruise control is a convenient feature that provides a smoother driving experience. It allows you to control the speed of your vehicle and has additional functions such as accelerating or decelerating by one mile per hour with a button tap. It disengages when you step on the brake pedal and cannot be activated at speeds below 25 miles per hour.
The ECM and/or a cruise control module control your vehicle’s cruise control system. The ECM uses various readings to automatically control the speed of your vehicle. If the cruise control system cannot be controlled automatically, the ECM will run a test to identify any problems.
The cruise control vent is an important component in the cruise control system as it affects the function of the cruise control servo, which mechanically adjusts and controls your speed when cruise control is activated. If the test reveals an ongoing problem, the ECM will activate a cruise control code related to the detected issue.
P0587 is a generic trouble code that indicates a low electrical level in the cruise control vent circuit, as detected by the ECM.
Cruise control switches:
What is the severity of this DTC?
The severity of this problem is low because you can still drive your car even with the P0587 trouble code. However, your car’s cruise control system may not be functioning properly. It is advisable to address this issue promptly, especially if you rely on your car’s cruise control system frequently, to prevent further complications and related problems.
What are some of the symptoms of the code?
Symptoms of a P0587 diagnostic code may include:
What are some of the common causes of the code?
Causes of the P0587 cruise control code may include:
What are some P0587 diagnostic and troubleshooting steps?
The first step in troubleshooting any malfunction is to research the Technical Service Bulletins (TSB) for known issues with your specific vehicle.
Advanced diagnostic steps are specific to each vehicle and may require specialized equipment and knowledge. The following are basic steps, but refer to a vehicle-specific repair guide for detailed instructions.
Basic Step #1
One common solution for resolving P0587 is to replace the cruise control switch. However, before proceeding with this fix, ensure that the switch is indeed faulty by following the diagnostic steps in your service manual. Start by locating your car’s battery and disconnecting it. Then, remove the steering wheel column bolt covers using a screwdriver or ratchet if necessary.
You may need to carefully remove the center airbag cluster from the steering wheel by unbolting it from the back. Detach the electrical connector connected to the airbag cluster by pressing the side clips and pulling them from the hard plastic side areas. Removing the steering wheel may be necessary, and a special puller may be required.
NOTE: Always refer to the service manual for proper steering wheel and airbag removal procedures specific to your vehicle!
Once the electrical connector has been detached from the cruise control switch, remove the bolts holding the switch onto the steering column bracket. Replace the old cruise control switch with the new one and reinstall everything in the reverse order. Reconnect the battery and test drive your vehicle, keeping safety in mind.
Basic Step #2
Another common problem associated with this code is a mechanical issue in the cruise control’s vacuum system. This could include physical damage to the cruise control vacuum solenoid, a vacuum leak, a kinked or obstructed line, etc. These mechanical problems are usually easy to identify during inspection once you have identified all the components involved in the system.
Repair or replace any vacuum leaks immediately, as they can lead to further issues if left unattended. Refer to your service manual for specific diagnostic procedures and component locations.
This article is for informational purposes only, and the technical data and service bulletins for your specific vehicle should always take precedence.
