U1132 – Lost Communication with Body Control Module (BCM).

The ODBII code U1132 indicates that there is a communication failure between the vehicle’s control module and the Body Control Module (BCM), which may affect various electrical functions and systems in the vehicle.

The severity of ODBII code U1132 is generally considered moderate to severe, as it indicates a communication issue that can affect various vehicle functions.

Common Causes For: U1131 SCP (J1850) Invalid or Missing Data for Fuel System

• Faulty Body Control Module (BCM)
• Damaged wiring or connectors
• Corroded terminals
• Poor ground connection
• Faulty communication network (CAN bus)
• Blown fuses
• Software issues or programming errors
• Intermittent electrical issues

Common misdiagnosis for U1132 Lost Communication with Body Control Module (BCM)”.

• Faulty Body Control Module (BCM)
• Wiring issues or shorts in the communication lines
• Faulty or corroded connectors
• Issues with the power supply to the BCM
• Problems with other control modules
• Software or firmware issues in the BCM
• Faulty fuses related to the BCM
• Grounding issues in the vehicle’s electrical system

Common Troubleshooting Steps

When dealing with the OBD-II code U1132, which indicates “Lost Communication with 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. Sometimes, multiple codes can provide more context for the issue.
• 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 or corroded.
• Check Power and Ground: **Power Supply: Verify that the BCM is receiving the correct voltage. Use a multimeter to check the power supply to the BCM.
• **Ground Connections: Ensure that the ground connections for the BCM are secure and free of corrosion.
• Inspect the BCM: **Physical Condition: Check the BCM for any signs of physical damage or water intrusion.
• **Reprogramming: If the BCM has been replaced, ensure that it has been properly programmed to the vehicle.
• Test Communication Lines: **CAN Bus Communication: Use a scan tool to check the communication on the CAN bus. If other modules are not communicating, the issue may be with the bus itself.
• **Scope Testing: If available, use an oscilloscope to check for proper signal levels on the communication lines.
• Check for Short Circuits: Inspect the wiring for any short circuits that may be affecting communication with the BCM.
• Look for Intermittent Issues: If the code is intermittent, try to replicate the conditions under which the code appears. This may involve checking for specific vehicle conditions or operations.
• Reset the Codes: Clear the trouble codes using the OBD-II scanner and see if the code returns. If it does, further investigation is needed.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have known issues or specific fixes for the U1132 code.
• Replace the BCM (if necessary): If all other troubleshooting steps fail and the BCM is determined to be faulty, consider replacing it. Ensure proper programming and configuration after replacement.1
• Seek Professional Help: If you are unable to resolve the issue, it may be best to consult a professional mechanic or automotive technician who has experience with the specific vehicle and its systems. By following these steps, you should be able to identify the root cause of the U1132 code and take appropriate action to resolve the communication issue with the Body Control Module.