P0592 OBD Error Code: Problem & Solutions

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Usually with this kind of problem, the direct impact can be seen on the cruise control system. Affected fuel consumption, engine stalling and non-responsive during acceleration are the first signs along with Malfunction Indicator Light illumination. OBD Code P0592 directly points out to the problem with the cruise control system and thus needs immediate treatment.

OBD-II Code Cruise control will not operate is defined as a Cruise Control Multi-Function Input "B" Circuit Low.

Most of the time the malfunction of the cruise control switch in the main cause of the problem along with the internal circuit getting harmed causing open or shorted circuit condition. The 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 P0592 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 Low?

• Faulty Speed Control Switch
• Speed Control Switch harness is open or shorted
• Poor electrical connections to the speed control switch circuit
• Blown Cruise Control Fuses
• Cruise control switch defective
• Cruise Control/Speed Connector malfunction
• Electronic Control Module issue

1. Speed Sensor - Speed sensor need to function properly for the cruise control to work. Replace faulty speed sensor now!
2. Speed Sensor Connector - Damaged connectors needs to be replaced immediately for proper functioning of the system and the PCM. Thus, replace faulty sensor connector now!
3. Cruise Control Switch - Damaged switch can also cause the cruise control to not operate at the time of need. Replace damaged switch now!
4. Cruise Control Connector - Replace damaged connector for proper functioning of the system. Buy new connector now!
5. Cruise Control Fuse - Replace blown fuses as it can be a quick solution to this OBD problem. Buy new fuses now!
6. Powertrain Control Module - Replace faulty PCM components and reprograms the PCM as it can also be the reason for storing the OBD code wrongly due to system problems. Buy quality parts from us.
7. Diagnostic Tool - Use factory grade diagnostic tools to detect and diagnose the problem properly. Explore from wide variety of tools and equipment form us. Buy today!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P0592 code by mentioning some major symptoms below:

Common Symptoms

• Cruise control active with abnormal speed
• Cruise control malfunction
• Cruise control light illumination
• Cannot set cruise control to desired speed
• A Service Engine Soon Lamp may or may not illuminated along this code
  

Have a look at some ways with which you can correct the P0592 code:

• Replacement of speed sensor
• Replacement of cruise control sensor
• Faulty wiring and connector replacement
• Blown fuses replacement
• Repair or reprogram PCM faults

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Here are some steps which you should follow in order to diagnose this P0592 fault code:

• 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 P0592 Code

• After replacing any faulty components, be sure to check for blown fuses. Sometimes multiple components are unnecessarily replaced simply because of a blown fuse.
• Replacement of cruise control switch or wiring
• Repair of vacuum lines to servo at throttle
• PCM repair and replacement
• Wiring and connector replacement