OBD-II code · Network

U0346 Software Incompatibility With Hybrid/EV Battery Interface Control Module M

A module reports a software version mismatch with hybrid/EV battery interface module M — typically after replacing one of the modules without programming the new unit to match the rest of the network.

Is it safe to drive with U0346?

The car may go into limp mode (reduced power). Get it diagnosed before a long trip.

Common causes

Most likelyModule replaced without programming
PossibleWrong part number for the vehicle
Less likelyGateway module routing CAN messages incorrectly

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

Repair at a glance

Difficulty: Medium
DIY friendly: Best left to a mechanic
Typical labour: 0.5–2 h
Emissions test: Usually unaffected
Parts involved: Hv Battery Interface Module M

Related codes

Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.