P2591 - OBD Trouble Code

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The trouble code P2591 can be described as Cruise Control Front Distance Range Sensor Left. The error code P2591 would start triggering when the PCM would detect some fault in left front distance range sensor for the adaptive cruise control system. One thing which you must keep in mind that its symptoms as well as causes would surely vary as it depends upon a number of things.

This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another. This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code. The P2591 trouble code would indicate that a left front distance range sensor for the adaptive cruise control system which is not as per the predetermined limit has been detected by the ECM. Now when this would occur, the fault code would be stored and there would be an illumination in the malfunction indicator light.

What causes this problem with the Cruise Control Front Distance Range Sensor Left?

• Defaults in the front distance range sensor left
• Front distance range sensor left harness is open or shorted
• Front distance range sensor left circuit poor electrical connection

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Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P2591 code by mentioning some major symptoms below:

Common Symptoms

• Illumination in the service engine soon light
• The driver might not be able to set the vehicle speed control if a cruise control associated code is stored in the PCM

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2591:

• It is necessary to perform proper service of the unsound front distance range sensor left harness
• Carefully adjust the faults in the powertrain control module
• The front distance range sensor left circuit should be restored to working order
• Adjust the flawed front distance range sensor left

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

The vehicle speed sensor data is utilized by the powertrain control module to help regulate vehicle speed when the cruise control is activated. There are many vehicles in which a small servo motor is attached to the throttle linkage.

Voltage received from the PCM and the cruise control module prompt the servo motor to open or close the throttle plate as per the requirement. There is a steel cable inside of a plastic housing is often utilized between the cruise control servo and the throttle linkage.

If the desired speed is less than the actual speed, then the throttle plate will be opened and if the actual speed is more than the desired speed, the throttle plate should be allowed to close. If there is an opened throttle plate, then it would cause engine RPM and vehicle speed to increase in order for the automobile to reach the desired speed.

When the throttle plate is closed, engine RPMs would decrease as well as the vehicle speed. There are other automobiles which are equipped with a drive by wire throttle system that utilizes no accelerator cable.

These types of automobiles control vehicle speed with the same actuator motor which opens and closes the throttle plate during normal driving. There are several tools which would be instrumental in diagnosing this error code successfully.

An OBD-II scanner and a digital volt/ohmmeter would prove to be helpful in performing a successful diagnosis. The automobiles that are equipped with adaptive cruise control systems utilize infrared sensors and lasers to detect vehicles and other objects that could potentially impede travel.

The activity in the vehicle's lane of travel is monitored by the adaptive cruise control systems and then the speed of the vehicle is adjusted accordingly. Then the next step would be to perform a visual inspection of all wiring as well as connectors.

Repair or restore the defective, disconnected, shorted, or corroded wiring, connectors, and components as per the requirement. Make sure to retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components appear to be in good working condition, then you should connect the scanner to the diagnostic connector and then record all stored codes as well as freeze frame data.

This information can be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored. Then you should continue by clearing the code and operating the vehicle to see if it returns. This will help to decide whether or not the malfunction is intermittent.

Now once the codes have been cleared, then the vehicle should be taken out for a test drive to see if the code returns. If the code fails to immediately return, then you might have an intermittent condition. Intermittent conditions can prove to be quite challenging to diagnose and in extreme cases it should be allowed to worsen before a right diagnosis can be made.

If the system parts seem to be in proper working order, then it would mean that there is faulty cruise control switch. Then the switch should be carefully replaced, then drive the vehicle and

operate the cruise control system at length to ensure that the problem does not persist. If the code returns, or the cruise control fails to set at the desired speed, raise the drive wheels and safely secure the vehicle.

Utilize 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). The electrical connector from the cruise control switch should be disconnected and test for voltage using the digital volt/ohmmeter.

After that you should compare your findings with manufacturer's specifications and restore the switch if readings coincide. If there is no voltage or ground signal at the switch, then the PCM should be disconnected and cruise control module connectors and perform a continuity test on the circuitry between the switches in the passenger compartment, the relevant fuse panel, and the powertrain control module.

Then the next step would be to compare your findings to manufacturer's specs and the open or shorted circuits should be repaired as per the requirement.

The codes which are present should be cleared up and the entire system should be retested. If there are no malfunctions in the continuity test, then you should perform a resistance test on the cruise control on/off switch and buttons by using the digital volt/ohmmeter. Make sure to leave the cruise control module and PCM disconnected before testing circuit resistance. The cruise control switches should be replaced as per the need. All the codes should be cleared up and then retest the system.

Common Mistakes When Diagnosing The P2591 Code

• Most of the mechanics do not check the blown fuses after they have replaced the defective components. Often a lot of components are unnecessarily replaced due to a blown fuse.