U2590 – Control Module Communication Bus Fault

The ODBII code U2590: Control Module Communication Bus Fault indicates a communication issue between control modules in a vehicle, suggesting that one or more modules are not able to communicate properly over the vehicle’s data bus.

The severity of ODBII code U2590 is moderate.

Common Causes For: U2589 Lost Communication with the Steering Angle Sensor.

• Faulty control module
• Damaged wiring or connectors
• Poor ground connections
• Short circuits in the communication bus
• Interference from other electronic devices
• Corroded terminals
• Software issues or bugs in the control module
• Low battery voltage or power supply issues

Common misdiagnosis for U2590 U2590: Control Module Communication Bus Fault

• Faulty control module
• Wiring issues or shorts
• Corroded connectors
• Power supply problems
• Software glitches or outdated firmware
• Faulty sensors
• Grounding issues
• Intermittent communication faults

Common Troubleshooting Steps

The OBD-II code U2590 indicates a “Control Module Communication Bus Fault.” This code typically points to a problem with the communication between various control modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. Sometimes, multiple codes can provide more context for the issue.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring and connectors associated with the control modules for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or damaged.
• Check the Control Modules: **Module Functionality: Verify that the control modules (e.g., Engine Control Module, Transmission Control Module, etc.) are functioning properly. If one module is faulty, it can affect communication.
• **Reprogram or Reset: If a module is suspected to be faulty, consider reprogramming or resetting it to see if that resolves the issue.
• Inspect the Communication Bus: **CAN Bus Integrity: Check the integrity of the CAN (Controller Area Network) bus. Use a multimeter to measure the voltage levels on the bus wires. The typical voltage should be around 2.5V when idle.
• **Termination Resistors: Ensure that the termination resistors (usually 120 ohms) are present and functioning at both ends of the CAN bus.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for short circuits or open circuits in the communication lines. This can help identify if there is a break in the communication path.
• Test Modules for Communication: Use a scan tool to attempt to communicate with each control module individually. If some modules respond while others do not, it may indicate a problem with the non-responding module.
• Inspect for Interference: Check for any aftermarket devices or modifications that may interfere with the communication bus, such as alarms, stereo systems, or other electronic devices.
• Battery and Ground Connections: Ensure that the vehicle’s battery is in good condition and that all ground connections are secure. Poor power or ground can lead to communication issues.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to communication faults.
• Professional Diagnosis: If the issue persists after performing the above steps, consider seeking help from a professional mechanic or dealership. They may have specialized tools and knowledge to diagnose complex communication issues.Conclusion Troubleshooting a U2590 code can be complex due to the nature of vehicle communication systems. Following these steps systematically can help identify and resolve the underlying issue. Always refer to the vehicle’s service manual for specific procedures and specifications related to your vehicle model.