U2288 – Lost Communication with the Body Control Module (BCM) – Bus Off.

The ODBII code U2288 indicates that there is a loss of communication with the Body Control Module (BCM) due to a “Bus Off” condition, which typically means that the BCM is unable to communicate on the vehicle’s data bus, often due to a fault in the wiring, connectors, or the module itself.

The severity of ODBII code U2288 is generally considered moderate to severe.

Common Causes For: U2287 Lost Communication with the Steering Angle Sensor.

• Faulty Body Control Module (BCM)
• Damaged wiring or connectors in the communication circuit
• Short circuit or open circuit in the CAN bus
• Corroded or loose connections
• Faulty or malfunctioning CAN bus transceiver
• Power supply issues to the BCM
• Software or firmware issues in the BCM
• Other modules on the bus malfunctioning or failing

Common misdiagnosis for U2288 Lost Communication with the Body Control Module (BCM) – Bus Off.

• Faulty Body Control Module (BCM)
• Wiring issues or damaged connectors
• Faulty CAN bus communication lines
• Power supply issues to the BCM
• Faulty or corroded ground connections
• Other module failures affecting communication
• Software or firmware issues in the BCM
• Battery or charging system problems

Common Troubleshooting Steps

When dealing with the OBD-II code U2288, which indicates “Lost Communication with the Body Control Module (BCM) – Bus Off,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues.
• Inspect the Wiring and Connectors: **Visual Inspection: Check the wiring harness and connectors related to the BCM for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or pushed back.
• Check the BCM: **Power and Ground: Verify that the BCM is receiving proper power and ground. Use a multimeter to check voltage at the BCM connector.
• **Module Functionality: If possible, test the BCM in another vehicle or replace it with a known good unit to see if the problem persists.
• Inspect the CAN Bus: **Bus Communication: The BCM communicates over the Controller Area Network (CAN) bus. Check for continuity and proper resistance in the CAN bus wiring.
• **Termination Resistors: Ensure that the CAN bus has the correct termination resistors in place and that they are functioning properly.
• Check for Short Circuits: Use a multimeter to check for short circuits in the wiring that could be causing the BCM to go into a “bus off” state.
• Scan for Communication Issues: Use a professional-grade scan tool to monitor the communication on the CAN bus. Look for any irregularities or interruptions in communication between modules.
• Inspect Other Modules: Since the BCM communicates with other modules, check for issues in other modules that may be affecting communication. Look for codes in other modules that may indicate a problem.
• Battery and Ground Connections: Ensure that the vehicle’s battery is in good condition and that all ground connections are clean and secure. Poor battery voltage or ground issues can lead to communication problems.
• Software Updates: Check if there are any software updates available for the BCM or other related modules. Sometimes, manufacturers release updates to fix communication issues.
• Clear Codes and Test Drive: After performing the above checks and repairs, clear the codes and take the vehicle for a test drive to see if the code returns.1
• Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers may have documented common issues and fixes for the U2288 code.1
• Professional Diagnosis: If the issue persists after all troubleshooting steps, consider seeking help from a professional mechanic or dealership with experience in diagnosing BCM and communication issues. By following these steps, you should be able to identify the root cause of the U2288 code and take appropriate action to resolve the issue.