P0B6D: Hybrid/EV Battery Voltage Sense K Circuit
What to do
If a battery pack replacement is quoted from this code, ask how the sense wiring was eliminated first — a faulty measuring wire and a failing cell group look identical to the car, and only one of them is a pack. Ask too which physical group the letter refers to, and how many of these codes are stored: the pattern is worth more than any single one. Nothing inside a traction pack is a home job.
What this code means
Cell group K's voltage sense circuit is faulty. The letter names which of the pack's twenty-six monitored groups is being measured and changes nothing else about the diagnosis; the family's argument — why there are so many, why they are the only thin wires in the pack, and how a faulty sense line is told from a tiring cell group — is at P0B3B.
Likely causes
Start here
- Damaged cell voltage sense harness · specialist
- Corroded or loose connector · easy
Less common
- Faulty battery pack sensor module · specialist
- Water ingress into a high voltage connector · specialist
- Weak or failed cell group in 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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