How many volts is a spark plug?

I’ve read that a car’s spark plug can actually give you quite a jolt of electricity if you’re not careful. However, I can’t find the specific figures for how much voltage they have. How many volts does a spark plug generally have?

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Eric Schad · Answered on Dec 05, 2022
Reviewed by Shannon Martin, Licensed Insurance Agent.
A spark plug can definitely give you quite a shock if you’re not careful. A spark plug generally has between 5,000 and 40,000 volts, although this figure can increase up to 100,000 volts in some cases.
The amount of voltage varies depending on what your car is doing. For example, a spark plug may emit 5,000 to 10,000 volts when you’re at a steady speed, but it may increase up to 15,000 or more volts if you’re accelerating. Always take the necessary precautions to avoid shock if you have to get under the hood.
If you need to replace the spark plugs in your vehicle, the replacement cost for spark plugs varies drastically, although you can buy and replace the part yourself for about $5.
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