U0412

Invalid Data Received From Battery Energy Control Module A

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear U0412 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX