U0412 code meaning
Invalid Data Received From Battery Energy Control Module A
Network system Generic code U04xx codes Check engine light
What U0412 means
U0412 is stored when the hybrid or engine controller receives data from battery energy control module A, the management unit of the high-voltage battery, that it rejects as invalid. Volkswagen's 2014 Jetta Hybrid OBD chart sets it on implausible received data. FCA lists U0412-00 for the 2019 Chrysler Pacifica plug-in hybrid (TSB 08-114-22) among codes that light the MIL and can remain as permanent codes, so the vehicle fails a state smog check; the fix is new software for the hybrid control processors, not a battery part. CARB requires emission-related control units to be monitored, which explains the MIL. U0111 means lost contact, U0413 covers module B, U0312 a software mismatch. Charging or electric driving may be limited.
U0412 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 U0412
- Check engine light on, code may become permanent
- Charging or electric driving limited
- Hybrid system warning message
Common causes of U0412
- Most likelySoftware error in hybrid controller or battery management (FCA: reflash HCP/AHCP)
- PossibleBus wiring or connector fault between battery module and hybrid controller
- Less likelyWeak 12 V battery disturbing module start-up
- Less likelyBattery energy control module internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery energy control moduleHybrid control moduleCAN bus wiring
What each part of U0412 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 12 | The exact fault in that area. |
What to do next
- Note U0412 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 U0412
What does U0412 mean?
U0412 means "Invalid Data Received From Battery Energy Control Module A". U0412 is stored when the hybrid or engine controller receives data from battery energy control module A, the management unit of the high-voltage battery, that it rejects as invalid. It is a generic code, so it means the same on every make.
Is it safe to drive with U0412?
Drive gently and only to a workshop. With U0412 the car can go into limp mode (reduced power) to protect itself.
Will U0412 fail an emissions test?
Yes, it can. U0412 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 U0412 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0412 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.