U0345 code meaning
Software Incompatibility With Hybrid/EV Battery Interface Control Module L
What U0345 means
L is the twelfth letter and thus the last board on packs with twelve, such as the twelve CSCs of BMW's i8, provided a maker counted them this way. The mismatch behind U0345 is easy to create during battery repair. Kia's bulletin ELE 151 for the 2011–2016 Optima Hybrid allows a BMS update only when the traction battery is swapped for a part number of the new generation, so that the controller logic matches the new pack; the right flash is confirmed by pack number and ROM ID, and the upgrade must run in manual mode, since auto mode is ruled out. Old pack, new logic or the reverse is exactly the pairing to avoid. U01AB is the code for a silent L, U04AC for implausible data from it.
U0345 at a glance
- Check engine lightUsually not
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0345
- Hybrid warning after high-voltage battery replacement
- Electric assist reduced
- MIL possible on hybrids
Common causes of U0345
- Most likelyBattery controller logic and pack generation do not match
- PossibleUpdate for new-generation packs applied to an old-generation pack
- Less likelyTwelfth board replaced with a unit of another software level
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery interface module l
What each part of U0345 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 45 | The exact fault in that area. |
What to do next
- Note U0345 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0345
What does U0345 mean?
U0345 means "Software Incompatibility With Hybrid/EV Battery Interface Control Module L". L is the twelfth letter and thus the last board on packs with twelve, such as the twelve CSCs of BMW's i8, provided a maker counted them this way. It is a generic code, so it means the same on every make.
Is it safe to drive with U0345?
Drive gently and only to a workshop. With U0345 the car can go into limp mode (reduced power) to protect itself.
Will U0345 fail an emissions test?
Yes, it can. U0345 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0345 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will U0345 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.