Software or calibration mismatch between the battery interface module and another module after a partial update; Replacement of the Hybrid/EV Battery Interface Control Module H with a unit carrying incompatible software; Failed or interrupted reprogramming event that left one module with incorrect software; Corrupted configuration data or variant coding in the battery interface module; Aftermarket or unauthorized software modification to a module on the network; Internal fault in the battery interface module causing it to report an incompatible software version; Network communication issue that prevents proper software version handshake between modules

DTC codes / U03xx · Software and configuration mismatches / U0341

U0341Software Incompatibility With Hybrid/EV Battery Interface Control Module H

U0341 is a manufacturer-specific communication code indicating that a control module on the vehicle's network has detected a software incompatibility with the Hybrid/EV Battery Interface Control Module H. The computer has compared software part numbers, calibration levels, or protocol versions between modules and found a mismatch that prevents proper data exchange.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaSoftware and configuration mismatches

Symptoms you may notice

Illumination of the check engine light or service vehicle soon message
Hybrid system warning light or reduced power mode
Inability to start or enter ready mode in some cases
Erratic battery state-of-charge readings or charging behavior
Often no symptoms besides the warning light if the incompatibility is minor
Multiple unrelated warning lights due to network communication disruption

Common causes, most likely first

Software or calibration mismatch between the battery interface module and another module after a partial update
Replacement of the Hybrid/EV Battery Interface Control Module H with a unit carrying incompatible software
Failed or interrupted reprogramming event that left one module with incorrect software
Corrupted configuration data or variant coding in the battery interface module
Aftermarket or unauthorized software modification to a module on the network
Internal fault in the battery interface module causing it to report an incompatible software version
Network communication issue that prevents proper software version handshake between modules

How to diagnose and fix it

Connect a scan tool and retrieve all stored codes from every module to confirm U0341 and identify related communication faults
Record the software part numbers and calibration IDs of the battery interface module and all other modules on the network
Check for and perform any available manufacturer software updates or service bulletins for the affected modules
Verify that the battery interface module is the correct part number and software variant for the vehicle
Perform a module reprogramming or configuration reset using the manufacturer's diagnostic software
Inspect network wiring and connectors for damage or corrosion if communication faults accompany U0341
If software cannot be corrected, replace and program the Hybrid/EV Battery Interface Control Module H

Software mismatch often follows a partial update

A common cause is a partial or interrupted reprogramming event where one module was updated but another was not, leaving incompatible software versions on the network.
U0341 can set after a battery interface module is replaced with a used unit that carries software from a different model year or trim level.
Some vehicles will set this code only after a battery disconnect or module reset, when modules re-handshake and discover the mismatch.
The code does not always mean the battery interface module is faulty; the incompatibility may originate from another module that was flashed with incorrect software.
Aftermarket performance tuners or unauthorized module modifications can introduce software that the battery interface module does not recognize as compatible.

Can I keep driving with U0341?

If the vehicle drives normally and only the warning light is on, you can usually continue driving to a repair facility, but avoid long trips or heavy loads. If the hybrid system warning is active or the vehicle enters reduced power mode, limit driving and seek service promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.