u1146 lost communication with external memory

OBD2 Code: U1146

Description: Lost Communication With External Memory

Definition: This diagnostic trouble code (DTC) indicates that the vehicle’s control module has lost communication with an external memory device. This can affect data storage and retrieval, impacting vehicle performance or diagnostics.

: Lost Communication with External Memory
Severity: Moderate

Common Causes

U1146 – Lost Communication with External Memory

Common Causes:

• Faulty external memory module
• Wiring or connection issues between the external memory module and the vehicle’s computer
• Corroded or damaged connectors related to the external memory module
• Power supply issues affecting communication with the external memory
• Software glitches in the external memory module

Common Misdiagnosis

Lost Communication with External Memory

Common Misdiagnosis: Replacing the external memory module without checking for wiring issues or connector problems.

Common Diagnostic Steps

Lost Communication with External Memory

1. Verify the code using an OBD2 scanner.
2. Check for any additional codes that may be present and address them first.
3. Inspect the wiring and connectors between the external memory module and the vehicle’s control modules for damage or disconnection.
4. Test the power supply to the external memory module to ensure it is receiving proper voltage.
5. Examine ground connections related to the external memory module for corrosion or looseness.
6. If applicable, update or reprogram the software of involved control modules to resolve communication issues.
7. Replace faulty components if necessary, such as a damaged external memory module or defective wiring harnesses.