Question about Kicker KX400.1 Car Audio Amplifier

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Protection light on

I had my amplifier for about a year but I hardly used it, most of the time it was unpluged or out of the truck, about 4 months ago I pluged it back up but only the protection light came on I tried in another car and still have the same problem. What can I do or where can I take it to get it fixed.

Posted by cristian preciado on


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Posted on Jan 21, 2008



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The most common reason for an amplifier to go into protect is shorted output transistors. Class D amps are generally a bit more difficult to repair (especially those that use surface mount components). I'd recommend you take it to a local repair shop to have it repaired. If you want to try to repair it yourself, it will be time consuming but I'll try to help you through it.

Posted on Dec 21, 2007


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SOURCE: protection light on

The amp probably has blown output transistors and is in need of repair.

Call some of the better car audio shops in your area and ask them who they use for repairs. If several use the same shop, it's a good indicator that they do good work.

Posted on Jan 22, 2008

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The manual would suggest you have a problem.

Register and download the manual for free at

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