P0515: Battery Temperature Sensor Circuit
What to do
Driveable. Worth having the battery terminals checked and cleaned as part of the diagnosis.
What this code means
A general circuit fault on the battery temperature sensor. Often integrated into the battery sensor module clamped to the negative terminal, in which case the connection at the terminal itself is worth checking before anything is replaced — a loose or corroded battery clamp produces a great many apparently unrelated electrical faults.
Likely causes
Start here
- Faulty battery temperature sensor · moderate
- Corroded battery terminals · easy
- Corroded or loose connector · easy
Less common
- Broken wire in control circuit · moderate
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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