U0413: Invalid Data Received From Battery Energy Control Module B
What to do
Expect reduced power and possibly restricted charging, and treat the range display as unreliable — see U0412, which explains why this system's caution is correct rather than excessive.
One question is worth asking early because it decides the size of the job: is only one section of the battery reporting problems, or several? Your battery's monitoring is split into sections. If only one is affected, the fault is local to it — its wiring or its own small module — which is far cheaper than anything pack-wide. If several are, the problem is in what they share.
And a second question worth asking before authorising work: can the affected section's sensing be replaced on its own? Some manufacturers supply those parts separately and some do not, and where they do not a sensing fault becomes a whole-battery repair. The difference in cost is very large, so it is worth establishing before anything starts.
Do not open or investigate the battery pack yourself under any circumstances.
What this code means
The second battery energy control module is broadcasting data that cannot be accepted as true. See U0412 for what these modules do and why their reports are treated more cautiously than anything else on the vehicle.
A second battery energy module means the pack's monitoring is distributed, which is normal on larger traction batteries: the cell groups are divided into sections, each with its own sensing module, reporting up to a supervisory controller. Splitting it that way keeps the sense wiring short, which matters because those are millivolt-level measurements over a physically large object.
That architecture makes the counting test unusually informative here, and it is the fastest way to place the fault:
- One section reporting implausibly points at that section's sense harness or its module — a localised fault, and the cheaper outcome.
- Several sections at once points at what they share: the supervisory module, the internal network between them, or their common supply. Never several independent failures.
That distinction is worth insisting on before a pack is opened, because opening a traction battery is specialist work with real cost attached.
One consideration specific to a sectioned pack is worth knowing, because it affects what a repair can achieve. Where a single section's sensing has failed, some manufacturers supply that section's module or harness separately and some do not — and where they do not, a sensing fault becomes a pack-level repair. Establishing which applies before authorising work is a fair question, since the answer changes the cost by an order of magnitude.
The high-voltage caution at U0412 applies without qualification.
Likely causes
Start here
- Faulty battery pack sensor module · specialist
- Corroded or loose connector · specialist
- Damaged data bus wiring · moderate
Less common
- Faulty battery energy control module · specialist
- Coolant leak inside the battery pack · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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