P0B2B: Hybrid/EV Battery C Voltage
What to do
As P0B23. On a vehicle with this many monitored batteries, getting the identification right is most of the job.
What this code means
The voltage of battery C is wrong.
As at P0B23 and P0B27, the letter is a designation rather than a description, and identifying which battery it refers to comes first. By the time a vehicle has a battery C, the multi-battery point at P0B23 has stopped being a caution and become the whole diagnosis — a car with three or four separately monitored batteries is one where guessing which is meant will waste the entire visit.
Likely causes
Start here
- Corroded or loose connector · easy
- Hybrid battery pack deterioration · specialist
Less common
- Weak or failed cell group in the battery pack · specialist
- Faulty battery pack sensor module · 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
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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