U0340

Software Incompatibility With Hybrid/EV Battery Interface Control Module G

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

~$167 (est.)

Symptoms

Check Engine light comes on
Reduced vehicle power
Limitation of hybrid system operation
Inability to charge the battery
Warning messages appear on the instrument panel

Causes

Incompatible software versions between modules
Incorrect software update
Replacing the control module without flashing
Software corruption
Problems with communication between modules

How to Fix

Diagnostics using a scanner that supports hybrid systems
Checking the software versions of all related modules
Software update or flashing
Checking the integrity of the wiring harness between modules
Repair only from an authorized dealer

Related codes

U0401 U0293 U0100