U2091 – Lost Communication with the Fuel Pump Control Module.
The ODBII code U2091 indicates a loss of communication between the vehicle’s control module and the fuel pump control module, suggesting a potential issue with wiring, connectors, or the fuel pump control module itself.
The severity of ODBII code U2091 is generally considered moderate to severe.
Common Causes For: U2090 Lost Communication with the Fuel Pump Control Module.
- Faulty Fuel Pump Control Module
- Damaged wiring or connectors
- Poor ground connection
- Blown fuse
- Faulty Engine Control Module (ECM)
- Corroded terminals
- Intermittent electrical issues
- Software issues or updates needed
- Fuel pump failure
Common misdiagnosis for U2091 Lost Communication with the Fuel Pump Control Module.
- Faulty fuel pump
- Bad fuel pump relay
- Wiring issues or shorts
- Defective Engine Control Module (ECM)
- Faulty fuel level sensor
- Bad ground connections
- Issues with the powertrain control module (PCM)
- Corroded connectors or terminals
Common Troubleshooting Steps
When dealing with the OBD-II code U2091, which indicates “Lost Communication with the Fuel Pump Control Module,” 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 fuel pump control module for any signs of damage, corrosion, or loose connections.
- **Connector Pins: Ensure that the pins in the connectors are not bent, corroded, or damaged.
- Test the Fuel Pump Control Module: **Power and Ground: Verify that the fuel pump control module is receiving the correct power and ground signals. Use a multimeter to check voltage and ground continuity.
- **Module Functionality: If possible, test the fuel pump control module separately to ensure it is functioning correctly.
- Check for Communication Issues: **CAN Bus Communication: Since U2091 is a communication-related code, check the CAN bus for proper operation. Look for any shorts, opens, or faults in the communication lines.
- **Scan Tool Communication: Ensure that your scan tool can communicate with the fuel pump control module. If it cannot, there may be a communication issue.
- Inspect the Fuel Pump: **Operation Check: Ensure that the fuel pump is functioning correctly. You can do this by listening for the pump operation when the ignition is turned on or by checking fuel pressure.
- **Power Supply: Verify that the fuel pump is receiving power when commanded by the control module.
- Check for Ground Issues: Ensure that all ground connections related to the fuel pump control module and the fuel pump itself are secure and free of corrosion.
- Look for Environmental Factors: Check for any environmental factors that may affect the fuel pump control module, such as moisture or heat that could cause intermittent failures.
- Perform a Reset: After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
- Consult Technical Service Bulletins (TSBs): Check for any manufacturer-specific TSBs related to the fuel pump control module or communication issues that may provide additional guidance.
- Seek Professional Help: If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify the root cause of the U2091 code and take appropriate action to resolve the issue.