P0590 - OBD Trouble Code

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Is the car engine not performing at par with the expectations? Do you notice affected performance, delayed throttle response and Cruise Control Light illuminated on the dashboard without getting on? This can be an indication of the problem with the cruise control system, resulting in OBD code P0590 getting stored in the Powertrain Control Module (PCM).

Cruise control was developed with the sole purpose of comfort in mind. Its sole purpose is to maintain a vehicle speed set by the driver manually via steering wheel buttons, multifunction i.e. signal lights, cruise, wipers, etc., switch mounted to the steering column, etc. Meanwhile, the driver no longer has to control the gas pedal and if the vehicle is equipped with an automatic transmission, it may also control and adjust shift points according to real-time driving conditions' demands

The cruise control module works in coordination with the powertrain control module (PCM) to help control and regulate the vehicle’s speed automatically when the cruise control system is engaged. If the PCM notes that the speed of the vehicle cannot be contained, then the entire cruise control system will be tested. If voltage/resistance levels noted by the PCM is outside of their standard range, then the P0590 code gets triggered.

What causes this problem with the Cruise Control Multi-Function Input “B” Circuit Stuck?

• Defective Cruise Control Switch
• Wiring problem or connector malfunction
• Cruise Control Button/Switch causing abnormal mechanical operation
• Blown Fuses
• Powertrain Control Module (PCM) failure
• Speed Control Switch Faulty
• Open/short Speed Control Switch

1. Speed Sensor - Sometimes the speed sensor doesn’t function properly causing the cruise control system to take improper decision in relation to the speed of the vehicle. Buy new sensor now!
2. Speed Sensor Connector - Check for faulty sensor connectors and replace them immediately. Buy new connector now!
3. Cruise Control Switch - Check for broken or faulty switch that does not allow the cruise control to function properly. Replace it with a new one today!
4. Cruise Control Connector - Cruise control connector can also be damaged causing wiring to also get damaged and connections disrupted. Replace it now!
5. Cruise Control Fuse - Check for blown cruise control fuses and replace it immediately. Normally replacing blown fuses can easily solve the problem. Buy new fuses now!
6. Powertrain Control Module - PCM can store and flash wrong OBD error if it is itself faulty. Replace the faulty PCM components immediately.
7. Diagnostic Tools - Use professional level tools to detect and correct the OBD code problems. Buy now!

It is vital 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 P0590 here:

Common Symptoms

• Abnormal Vehicle Speeds
• Cruise Control not working
• Cruise Control Light illumination without getting on
• Cruise control not operating at desired speed
• Blown Cruise Control Fuses
• Check Engine Soon Warning Light illuminating on the dashboard

Want to correct the Trouble Code P0590? Read these points mentioned below:

• Cruise control switch replacement
• Wiring and connector replacement
• Replacement of blown fuses
• Speed sensor and connector replacement

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P0590 code to be stored:

• Make use of an OBD-II scanner (or code reader) and a digital volt/ohmmeter to perform a successful diagnosis. Begin with a visual inspection of all wiring and connectors. Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary.
• 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 to the diagnostic connector and record all stored codes and freeze frame data.
• Clear the code again and operate 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.
• Vacuum operated cruise control systems are designed to operate using a combination of vacuum from the engine and an electronic cruise control module. When the cruise control module commands the cruise control to set, the servo solenoid opens allowing vacuum to the servo. The cruise control module then uses a signal from the driver controls to regulate the flow of vacuum from the engine and adjust or maintain vehicle speed with the throttle linkage.
• Inspect and replace the one-way vacuum valve as needed. Repair or replace damaged or corroded components as needed. 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.
• Perform a resistance test on the cruise control on/off switch and buttons using the digital volt/ohmmeter. Remember to leave the cruise control module and PCM disconnected before testing circuit resistance. Replace cruise control switches as required. Clear the codes and retest the system.

Common Mistakes When Diagnosing the P0590 Code

The main problem when diagnosing the P0590 code comes from not properly following the OBD-II trouble code protocol. The protocol should always be adhered to, step by step, to make sure that all repairs are efficient, and don’t feature erroneous replacements. It is common for entire components to be unnecessarily replaced when blown fuses are the actual issue. Also check for wiring and connectors before replacing any other component without proper inspection.