What it means
A control module has detected that the software in hybrid/EV battery interface control module L is incompatible with its own software or configuration. Battery-system functions may be affected; the specific effects depend on the vehicle.
How it works
Battery interface control module L is one of the modules involved in monitoring or managing the hybrid/EV battery system. A vehicle control module compares the software or configuration information reported by module L with what it expects and sets U0345 when they do not match. The affected battery functions depend on the vehicle’s design.
Common causes
Most likely first.
- Incorrect or incompatible battery interface control module software
- Module replacement without required programming or configuration
- Incorrect module part number
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Capture freeze-frame data and scan all modules for related codes to find the controller reporting the mismatch and any faults associated with module L.
- Check service records for a module L replacement or software update; the module may not have received the correct vehicle configuration.
- Read module L’s identity and software or calibration details with a capable scan tool, then compare them with the vehicle’s service information.
- Inspect accessible module L connectors and harnesses for poor connections, corrosion, or visible damage using the required high-voltage precautions.
- Verify module L’s part number and configuration are correct for the vehicle, then carry out the manufacturer-specified programming or setup.
Common fixes
- Reseat or repair an accessible module L connector or damaged wiring.
- Program or configure module L with the correct software for the vehicle.
- Replace an incorrect module L with the compatible specified unit.
- Replace module L if it is confirmed faulty and cannot accept the correct programming.
Can I keep driving?
Avoid extended trips if battery warnings, reduced power, or shutdowns are present, and arrange diagnosis promptly. Pull over safely if the vehicle displays a stop instruction or enters a reduced-power condition.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.