P0B1D: Hybrid/EV Battery Pack Voltage Sense C Circuit Intermittent/Erratic
What to do
As P0B18 — jumping readings mean a connection, and that argument is worth making to anyone who quotes a battery for it.
What this code means
Sense circuit C is reading erratically. As at P0B18, a value that steps or jumps is a connection rather than chemistry, because a battery section cannot change that quickly — which makes this the variant least likely to end in a pack replacement. Family argument at P0B14.
Likely causes
Start here
- Corroded or loose connector · easy
- Damaged cell voltage sense harness · specialist
Less common
- Water ingress into a high voltage connector · specialist
Symptoms
Components involved
Information, not instruction
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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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Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
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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