U0340
Software Incompatibility With Hybrid/EV Battery Interface Control Module G
U0340 is an OBD-II diagnostic trouble code meaning: Software Incompatibility With Hybrid/EV Battery Interface Control Module G. Common causes: incompatible software versions between modules, incorrect software update. Estimated repair cost: ~$167.
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
Error U0340 by Vehicle Brand
FAQ
What does the U0340 code mean?
U0340 is an OBD-II diagnostic trouble code that indicates: Software Incompatibility With Hybrid/EV Battery Interface Control Module G
What causes a U0340 error code?
The most common causes of U0340 include: Incompatible software versions between modules; Incorrect software update; Replacing the control module without flashing; Software corruption.
How do I fix a U0340 diagnostic trouble code?
To fix U0340: Diagnostics using a scanner that supports hybrid systems. Checking the software versions of all related modules. Software update or flashing. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0340?
Do not drive — repair immediately
How much does it cost to fix U0340?
The estimated repair cost for U0340 is ~$167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat