What it means
A control module has detected that the software in hybrid/EV battery interface control module H 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 H 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 H with what it expects and sets U0341 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
- Save freeze-frame data and scan all modules for related codes to determine which controller detected the mismatch and whether other battery interface modules also report faults.
- Review recent service or replacement work involving module H, because an unprogrammed or incorrectly configured replacement can cause this code.
- Use a capable scan tool to retrieve module H’s identity and software or calibration information, then check it against the vehicle’s service information.
- Visually check accessible module H connectors and harnesses for poor seating, corrosion, or damage while observing the vehicle’s high-voltage safety procedures.
- Verify module H’s part number and configuration for this vehicle, then complete the manufacturer-specified programming or setup.
Common fixes
- Reseat or repair an accessible module H connector or wiring fault.
- Load the correct vehicle-specific software or configuration into module H.
- Install the correct compatible module H if the existing part number is wrong.
- Replace module H if it is confirmed unable to communicate or accept programming.
Can I keep driving?
Do not assume the battery system is operating normally if warnings, reduced power, or shutdowns accompany this code; arrange diagnosis soon. Stop in a safe place if the vehicle limits power or instructs you to stop.
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.