U0313 code meaning
Software Incompatibility With Battery Energy Control Module B
Network system Generic code U03xx codes Check engine light
What U0313 means
Battery energy control module B is a second battery controller, for instance a sub-unit inside the pack that measures part of the cells for the main battery management. U0313 means the network does not accept its software or calibration. No manufacturer documents U0313 publicly. Mitsubishi's 2018 Outlander PHEV has such a pair: the main BMU expects frames from a sub-BMU and records U0112 after 0.3 s without them. Bulletin TSB-18-54-005 shows that the sub-unit's software matters on its own: a wrongly programmed sub-BMU took electrical noise for a fault in the leak detection circuit, lit several warning lamps and held the car to 60 km/h until it was reflashed. A mismatch flagged by U0313 can have similar effects: hybrid warning, MIL and limited power. U0312 covers module A, U0413 invalid data from module B.
U0313 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0313
- Several warning lamps including MIL and hybrid system warning
- Power or speed limited until the next restart
- Electric operation or charging restricted
Common causes of U0313
- Most likelySub-module software outdated or faulty, newer level required
- PossibleModule B or battery section replaced with a different variant
- PossibleMain battery management updated without module B
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery energy module bControl module software
What each part of U0313 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 13 | The exact fault in that area. |
What to do next
- Note U0313 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 U0313
What does U0313 mean?
U0313 means "Software Incompatibility With Battery Energy Control Module B". Battery energy control module B is a second battery controller, for instance a sub-unit inside the pack that measures part of the cells for the main battery management. It is a generic code, so it means the same on every make.
Is it safe to drive with U0313?
Drive gently and only to a workshop. With U0313 the car can go into limp mode (reduced power) to protect itself.
Will U0313 fail an emissions test?
Yes, it can. U0313 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 U0313 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0313 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.