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Can an electric car's 12-volt battery fail?
The auxiliary battery powers electronics and control systems needed to activate the vehicle. Its symptoms can look like a main-battery problem.
What it may indicate
- Displays, locks or electronics behave erratically
- The vehicle will not enter ready mode despite traction-battery charge
- Multiple electrical warnings appear at once
What to check
- Test the auxiliary battery and its charging system using the correct procedure
- Inspect connections and terminals
- Confirm the manufacturer-specified replacement battery
When to prioritize an inspection
Do not jump-start or disconnect components without checking the manufacturer's procedure; some vehicles require specific steps to protect electronics.
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