U2297 – Lost Communication with Battery Energy Control Module (BECM).

The ODBII code U2297 indicates a loss of communication between the vehicle’s main control module and the Battery Energy Control Module (BECM), which may affect the management of the vehicle’s battery system.

The severity of ODBII code U2297 is generally considered moderate to high.

Common Causes For: U2296 U2296: Control Module Communication Bus Failure

• Faulty Battery Energy Control Module (BECM)
• Damaged wiring or connectors
• Corroded terminals
• Poor ground connections
• Malfunctioning power supply to the BECM
• Software issues or programming errors
• Faulty communication network (CAN bus issues)
• Low battery voltage or weak battery
• Intermittent electrical connections

Common misdiagnosis for U2297 Lost Communication with Battery Energy Control Module (BECM)”.

• Faulty Battery
• Bad Battery Connections
• Defective Alternator
• Wiring Issues
• Faulty Power Distribution Module
• Malfunctioning Engine Control Module (ECM)
• Corroded Connectors
• Software Issues in the BECM
• Faulty Ground Connections
• Issues with the Vehicle’s Body Control Module (BCM)

Common Troubleshooting Steps

When dealing with the OBD-II code U2297, which indicates “Lost Communication with Battery Energy Control Module (BECM),” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes. Sometimes, other codes can provide context or indicate related issues.
• Inspect the Battery and Connections: **Battery Condition: Ensure the battery is in good condition and fully charged.
• **Connections: Check the battery terminals and connections for corrosion, looseness, or damage. Clean and tighten as necessary.
• Examine Wiring and Connectors: **Wiring Harness: Inspect the wiring harness leading to the BECM for any signs of damage, fraying, or wear.
• **Connectors: Check the connectors for corrosion, bent pins, or poor connections. Ensure they are securely connected.
• Test the BECM: If accessible, test the Battery Energy Control Module itself. This may involve checking for power and ground at the module.
• If you have access to a scan tool that can communicate with the BECM, check if it responds to commands.
• Check Communication Lines: **CAN Bus: Since the BECM communicates over the CAN bus, check for issues with the CAN wiring. Look for shorts, opens, or interference.
• **Termination Resistors: Ensure that the CAN bus termination resistors are present and functioning correctly.
• Inspect Fuses: Check the fuses related to the BECM and the communication network. Replace any blown fuses.
• Perform a Visual Inspection: Look for any signs of physical damage to the BECM or surrounding components. This includes checking for water intrusion or physical impacts.
• Reset the Codes: After performing inspections and repairs, clear the codes using the OBD-II scanner and see if the code returns after a test drive.
• Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the BECM or communication issues. There may be known fixes or updates available.
• 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.Additional Considerations
• Software Updates: Sometimes, a software update for the vehicle’s control modules can resolve communication issues.
• Environmental Factors: Consider if any recent changes (e.g., battery replacement, electrical work) may have contributed to the issue. By following these steps, you should be able to identify the cause of the U2297 code and take appropriate action to resolve it.