Guide To P0589 OBD Error Code Solutions

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Do you notice abnormal speeds when the cruise control is on? Or does the cruise control is not functioning entirely? There can also be times when the cruise control gets automatically on or off without any action. All these are indication of cruise control malfunction, causing OBD code P0589 getting stored and flashed by the PCM (Powertrain Control Module).

An OBD code P0589 is stored in the vehicle’s PCM when it has found a fault in the electrical circuit of the cruise control system. A vehicle’s PCM works with the cruise control module to automatically control the vehicle’s speed. Cruise control works to help a driver maintain a safe speed without the need to constantly keep pressure on the accelerator pedal.

P0589 code can be caused by the variable valve or cylinder management system turning on and off during cruising speeds, light throttle conditions, or on flatter roads. This excessive switching can cause increased oil consumption, dropping oil pressure levels outside of allowed parameters and can no longer operate the valve or cylinder management system. If the PCM cannot control the vehicle’s speed, the system initiates a self-test and stores the P0589 code if the voltage/resistance level in the cruise control system is not normal.

What causes this problem with the Cruise Control Multi-Function Input "B" Circuit?

• Multi-function/Cruise control switch defective, stuck, broken, missing
• Damaged wiring due to corrosion or wear and tear
• Corroded pins, broken plastic tabs, swollen connector body, etc. causing connector malfunction
• Abnormal Mechanical Operation due to fluids/dirt/grime in cruise control button/switch
• PCM issue (e.g. water intrusion in computer body, internal short, internal overheating, etc.)

1. Cruise Control Switch - The cruise control switch can be defective, struck or broken causing the cruise control functions to not work properly. Thus, replace the switch, if needed.
2. Cruise Control Relay - Replace damaged control relay and check if the cruise control is functioning properly or not. Buy quality cruise control parts from us.
3. Cruise Control Connector - Check for faulty wiring and connectors and replace it immediately. Replace faulty connector now!
4. Cruise Control Fuse - Fuses are the first think that get blown to protect the complete system and other components. Thus, always check for blown fuses and replace them first. Buy fuses from us now!
5. Powertrain Control Module - P0589 error code also relates to problems with the PCM. This can cause improper engine and throttle response. Replace faulty PCM now.
6. Fuel Injection System - Affected cruise control system can cause problem with the fuel injection system affecting the economy and performance. Thus replace faulty fuel injection system parts now!
7. Diagnostic Tool - Use professional scanning and diagnostic tools to detect the OBD error code. Buy from us now!

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0589 here:

Common Symptoms

• Abnormal vehicle speeds
• Non-Functional Cruise control
• Cruise control light illuminated regardless of switch position
• Cannot set cruise control to desired speed
• Affected throttle response
• Affected fuel economy

Here are some ways with the help of which you will be able to correct the OBD Code P0589.

• Repair or replace any damaged, corroded, or loose wiring or connectors
• Replace any blown fuse(s)
• Replace any damaged connectors
• Replace any damaged vacuum supply hoses
• Replace damaged or defective one-way vacuum valve
• Replace a damaged or defective cruise control switch

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Here are some steps which you should follow in order to diagnose this fault code:

• When the cruise control in active, the PCM uses vehicle speed sensor data to help regulate vehicle speed.
• If the desired speed is less than the actual speed, the throttle plate will be opened and if the actual speed is more than the desired speed, the throttle plate will be allowed to close.
• When the throttle plate is opened it causes engine RPM and vehicle speed to increase in order for the vehicle to reach the desired speed. When the throttle plate is closed, engine RPMs decrease as does vehicle speed.
• Other vehicles are equipped with a drive by wire throttle system that uses no accelerator cable. These types of vehicles control vehicle speed with the same actuator motor which opens and closes the throttle plate during normal driving. Several tools will be instrumental in successfully diagnosing this code.
• A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in performing a successful diagnosis.
• Begin with a visual inspection of all wiring and connectors and repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary
• Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data. This information can be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored.
• Continue by clearing the code and operating the vehicle to see if it returns. This will help to determine whether or not the malfunction is intermittent. After the codes are cleared, test drive the vehicle to see if the code returns. If the code fails to immediately return, you may have an intermittent condition.
• Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made.
• Check vacuum supply hoses visually and replace any hoses that are questionable. If hoses appear normal, perform vacuum pressure test and compare your findings with manufacturer’s specifications and repair vacuum lines or engine components as required.
• Test the one way valve by attempting to blow air through it from both directions. You should only be able to blow through it from one direction. Replace the one way vacuum valve as needed. Begin the diagnosis by performing a careful visual inspection of al visible wiring harnesses, linkages, cables, electrical connectors and fuses.
• Repair or replace damaged or corroded components as needed and reset the PCM and retest the cruise control system. If the system parts seem to be in proper working order, suspect a faulty cruise control switch. Replace the switch then test drive the vehicle and operate the cruise control system to ensure that the repair was successful.
• If the code returns, or the cruise control fails to set at the desired speed, raise the drive wheels and safely secure the vehicle.
• Using a helper inside the vehicle, place the vehicle in drive and allow the speedometer to reach a speed sufficient to set the cruise control (usually 25 to 35 mph).
• Disconnect the electrical connector from the cruise control switch and test for voltage using the digital volt/ohmmeter. Compare your findings with manufacturer’s specifications and replace the switch if readings coincide. If there is no voltage or ground signal at the switch, disconnect the PCM and cruise control module connectors and do a continuity test on the circuitry between the switches in the passenger compartment, the relevant fuse panel, and the PCM
• Compare your findings to manufacturer’s specs and repair open or shorted circuits as required. Clear any codes that are present and retest the system. If the continuity test reveals no malfunctions, perform a resistance test on the cruise control on/off switch and buttons using the digital volt/ohmmeter. Replace cruise control switches as required.

Common Mistakes When Diagnosing the P0589 Code

• Cruise control vent solenoid failure
• Powertrain Control Module (PCM) failure
• Wiring and connector issue