U0412 Invalid data received from battery energy control module A
What U0412 means
On hybrid and electric cars, the battery energy control module manages the high-voltage battery and reports its state of charge, temperature and limits to other modules. U0412 means another module received messages from it that are implausible. The car may limit power or charging until the cause is found.
U0412 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 30–250 €
- Workshop time
- 0.3–1.5 h
- Repair difficulty
- Medium
- DIY possible
- Yes
- Check engine light
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Hybrid or EV system warning light
- Reduced power or limited driving range
- Charging not starting or interrupted
- Ready mode not available in some cases
Common causes
- Fault already stored in the battery energy control module
- Low or failing 12 V auxiliary battery
- Damaged CAN wiring or corroded connector to the battery module
- Battery module software mismatch
- Internal fault in the battery management module
Can I keep driving with U0412?
You can usually drive if the car enters ready mode, but have it diagnosed within one or two weeks. Expect possible power or charging limits.
What to check first
- Read codes in the battery energy control module and hybrid/EV control unit
- Test the 12 V battery and its connections
- Check for software updates for the battery management and hybrid control modules
- Have high-voltage system checks done only by a qualified technician
Related codes
- U0415 Invalid data received from ABS control module
- U0422 Invalid data received from body control module
- U0401 Invalid data received from engine control module (ECM/PCM A)
- U0428 Invalid data received from steering angle sensor module
- U0433 Invalid data received from front distance range sensor
- U0252 Lost communication with rear lighting control module B
- U0184 Lost communication with radio
- U0140 Lost communication with body control module
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
Updated: