U1692 – refers to a communication issue, specifically indicating Lost Communication with the Body Control Module (BCM).

The ODBII code U1692 indicates a communication issue where the vehicle’s diagnostic system has lost communication with the Body Control Module (BCM), which is responsible for managing various electronic functions in the vehicle.

The severity of ODBII code U1692 is moderate to high.

Common Causes For: U1691 Communication Bus Off.

• Faulty Body Control Module (BCM)
• Damaged wiring or connectors
• Corroded terminals
• Poor ground connections
• Faulty or disconnected communication lines
• Malfunctioning power supply to the BCM
• Software issues or programming errors
• Other module failures affecting communication

Common misdiagnosis for U1692 refers to a communication issue, specifically indicating “Lost Communication with the Body Control Module (BCM).

• Faulty Body Control Module (BCM)
• Wiring issues or damaged connectors
• Faulty or corroded ground connections
• Issues with the power supply to the BCM
• Faulty ignition switch
• Malfunctioning other control modules
• Software or programming issues
• Battery or charging system problems
• Faulty sensors or actuators related to the BCM
• Intermittent electrical connections

Common Troubleshooting Steps

When dealing with OBD-II code U1692, which indicates “Lost Communication with the Body Control Module (BCM),” 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 leading 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.
• Test 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.
• **Communication Lines: Check the communication lines (CAN bus) for continuity and proper voltage levels. Look for shorts or open circuits.
• Check for Short Circuits: Inspect the wiring for any short circuits to ground or to other wires that could disrupt communication.
• Inspect Related Modules: If the BCM communicates with other modules, check those modules for faults. A problem in another module can sometimes affect communication with the BCM.
• Scan for Communication Issues: Use a scan tool to monitor live data and check if the BCM is responding. If it’s not, it may need to be replaced.
• Check for Software Updates: Sometimes, a software update for the BCM or other modules can resolve communication issues. Check with the manufacturer for any available updates.
• Reset the System: Clear the trouble codes using the OBD-II scanner and see if the code returns. Sometimes, a temporary glitch can cause communication issues.
• Inspect Fuses: Check the fuses related to the BCM and other modules. A blown fuse can interrupt communication.
• Replace the BCM (if necessary): If all other troubleshooting steps fail and the BCM is determined to be faulty, consider replacing it. Ensure that the new BCM is programmed to the vehicle if required.1
• Consult a Professional: If you are unable to resolve the issue, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model.Conclusion Troubleshooting OBD-II code U1692 involves a systematic approach to identify and resolve communication issues with the BCM. By following these steps, you can narrow down the potential causes and take appropriate action to fix the problem.