P0BAB: Hybrid/EV Battery Voltage Sense W Circuit Low
What to do
As P0B3D — a group reading almost nothing is usually a disconnected or broken measuring wire, because a real cell group does not empty quietly. Worth saying to anyone who quotes a battery for it.
What this code means
Cell group W's sense circuit is reading below its valid range — the opens-and-resistance direction, where a near-zero reading points at a broken measuring wire rather than an empty cell group. Set out at P0B3D; family argument at P0B3B.
Likely causes
Start here
- Damaged cell voltage sense harness · specialist
- Corroded or loose connector · easy
Less common
- Wiring shorted to ground · moderate
- Weak or failed cell group in the battery pack · 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
Be the first to write this up
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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