P0588 Cruise Control Vent Control Circuit High
Description and meaning of DTC p0588
This is a generic powertrain diagnostic trouble code (DTC) and typically applies to OBD-II vehicles. Vehicle makes may include but aren't limited to Dodge, Jeep, Honda, Chrysler, Ram, Hyundai, Chevrolet, etc. Cruise control is a feature that makes driving your vehicle more convenient and provides you with a much smoother driving experience. While its main function is to control the speed of your vehicle, it has other uses, too. For instance, it allows you to accelerate or decelerate your car by one mile per hour (for example) with just a simple tap of a button. It also keeps you safe by disengaging as soon as you step on the brake pedal. Also, you won't be able to activate it if your car is running at speeds less than 25 miles per hour. Your vehicle's cruise control system is controlled by the ECM (Engine control module) and/or potentially a cruise control module. The ECM uses a vast amount of readings to control the speed of your vehicle automatically. If you're unable to automatically control your vehicle speed using cruise, the ECM will run a test involving the entire cruise control system to determine if there are any problems within. Most times, the cruise control vent is used in cruise control systems to ensure the ECM is capable of adjusting vacuum within the system. The vent's functionality is integral, because at times, it can directly affect the cruise control servo's function. And the servo is responsible for mechanically adjusting and controlling your speed when cruise control is activated. If the test reveals an on-going problem, the ECM will activate a cruise control code that correlates with the issue detected. P0588 is a generic trouble code that refers to "Cruise Control Vent Control Circuit High. " It appears when the test conducted by the ECM detects a higher than normal electrical level from the cruise control vent circuit.
p0588 diagnostic trouble code symptoms
Symptoms of a P0588 diagnostic code may include: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 controlCheck/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 casesOne or more cruise control functions not workingIrregular/Intermittent general cruise control functionality
DTC p0588 - possible causes
Causes for this P0588 cruise control code may include:Problematic or malfunctioning cruise control switchPoor electrical connection in speed control/vent control solenoidSpeed control/vent control harness is open or a short circuit is presentVacuum leak or obstruction within cruise control systemDamaged or corroded connectorsDefective vent control solenoidBlown fuses (may be a result of underlying electrical issue in cruise control vent control circuit)
How to fix OBD-II diagnostic trouble code p0588
The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB) for known issues with the specific vehicle. Advanced diagnostic steps become very vehicle specific and may require the appropriate advanced equipment and knowledge to perform accurately. We include basic steps below but refer to a vehicle year/make/model/powertrain specific repair guide for specific steps for your vehicle. Basic Step #1To solve the P0588, one of the most common solutions is to replace the cruise control switch so I will elaborate on this one. However, before proceeding with this fix, it's important that you are sure the switch is in need of a replacement. If you're certain that the switch is faulty, by following diagnostic steps in your service manual, you can 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 have to carefully remove the centre air bag cluster from the centre of the steering wheel by unbolting it from the back of the steering wheel. Then, detach the electrical connector connected to the air bag cluster by pressing the side clips and pulling them from the hard plastic side areas. Removing your steering wheel to access the switch may be necessary, in which a special puller may be required. NOTE: Always refer to service manual for proper steering wheel/AIR BAG removal procedures unique to your vehicle!Once the electrical connector has been detached from the cruise control switch, detach the switch by removing the bolts that are holding the switch onto the steering column bracket. Replace the old cruise control switch with the new one and reinstall everything in the opposite order. Reconnect the battery and test drive your vehicle, make sure the traffic isn't too bad when testing your cruise control to keep safety in mind here. Basic Step #2Another common problem when it comes to this code, is a mechanical issue present in the cruise control's vacuum system. This could mean physical damage to the cruise control vacuum solenoid itself, a vacuum leak in the system, kinked or obstructed line, etc. All these mechanical problems are generally easy to spot while first inspecting, once you've identified all the components involved within the system. Repair or replace any vacuum leaks immediatelly as they can produce more issues down the road if left unattended. Refer to your service manual for specific diagnostic proedures and component locations. This article is strictly for information purposes only and the technical data and service bulletins for your specific vehicle should always take precedence.