U0412
Invalid Data Received From Battery Energy Control Module A
Communication network (hybrid/EV battery)
Generic OBD-II
High
What it means
U0412 sets when a control module reads data from the battery energy control module — the management system for a hybrid or EV high-voltage battery — that is missing or implausible. Because this module oversees the traction battery, bad data can limit or disable the hybrid system, causing reduced power or a no-start.
High
Can I keep driving? Risky — the hybrid/high-voltage battery system may be limited or disabled, causing reduced power or a no-start of the hybrid system; get it checked before driving.
Common symptoms
What you'll notice
- Check-engine or hybrid/EV system warning light on
- Reduced power or the hybrid system won't start
- Charging or state-of-charge problems
- "Service hybrid system" or similar warning message
- Related communication codes stored in other modules
Common causes
Most likely first
- Faulty battery energy (battery management) control module or its power/ground supplyLikely
- Corroded, loose, or damaged connectors and data-bus (CAN) wiringCommon
- Low or unstable 12V battery and charging-system voltageCommon
- Software incompatibility after a module was replaced or updatedLess often
- An underlying high-voltage battery or sensor fault reported by the moduleLess often
How to diagnose & fix
Work through it in order
- Scan every module and record all stored codes and freeze-frame data before clearing.
- Check 12V battery and charging voltage — weak or noisy voltage often triggers bus data errors.
- Inspect the connectors and low-voltage wiring to the battery energy control module and along the data bus.
- If a module was recently replaced or flashed, confirm the software is correct and compatible.
- Follow the manufacturer's pinpoint tests for the module; high-voltage battery work should be left to qualified technicians.
FAQ
Quick answers
Is it safe to drive with U0412?+
Not really — this can limit or disable the hybrid battery system, causing reduced power or a no-start. Have it checked before driving.
Can I just clear U0412?+
You can, but if the battery energy module or its data link is still faulty the code returns. High-voltage systems should be diagnosed by a qualified technician.
Related codes
Often seen with U0412
Read & clear U0412 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX