There are many different reasons why a car amplifier will get stuck in protection mode. The common question we get asked is well how to get an amp out of protection mode. The reason why your car amplifier is in protection mode is because the circuit inside has shut it down from further operation to prevent possible damage to the internals of your installed car amplifier wiring kit. Most of time it is a poor installation of your car amplifier from somebody that has caused this problem. However, in some cases the car amplifier stuck in protection mode can also fail and maybe due a service or repair from an amp technician local to you.
If you notice that your car amp goes into protection mode when the bass hits, then this is because you don't have enough voltage produced in your cars electrical system. Your stock car battery and stock alternator simply can't keep up with the demands from your amp. This is why your car amplifier may not go into protection mode at lower volumes, but as soon as you turn up the car stereo when the bass hits it will go off again. The way to get around this is to upgrade your vehicles electrical system components, get a deep cycle yellow optima battery and a higher amp alternator. Consider doing the BIG 3 upgrade, which involves replacing stock battery cables in your engine back with thicker wires. This will help improve the flow of electricity around your vehicle for better bass performance.
If your car amplifier goes into protection mode without playing any music this is not to do with insufficient voltage drop. The common cause to this problem is usually a poor ground wire. You need to ensure the ground terminal that attaches onto the bolt of the car is crimped firmly with as much copper wire possible that can fit in the ring terminal. Also, you need to ensure that the grounding terminal is attached to a good ground. When I say good ground, the metal was you mounting the car amp ground wire needs to be filled down to a point were all the paint has been removed. Paint acts as an insulator and if that’s the cause it will not make proper contact with the vehicles body. A poor ground can cause your car amplifier to go into protection mode.
You also need to make sure the speaker wire connections are firm and are not shorted from the channel terminals found on the amp. Try replacing the speaker wire and rechecking the connections found on the speaker terminal cup fitted onto the subwoofer enclosure. If you disconnect your speaker wire and your car amplifier goes out of protection then your subwoofer could have a faulty voice coil or poor connections on the terminals found inside the box. Remove your car subwoofer from the enclosure and inspect the wiring. You also need to make sure the ohm load created by your subwoofer matches what the car amplifier stuck in protection mode can handle. If the amp ohm load is stable at 2 ohms and your subwoofer is wired to 1 ohm, the amplifier will go into protect to prevent damage to it.
Overheating can cause your car amplifier to also go into protect mode. This is because it is shutting itself down from melt down. This can happen a lot during summers and also because of the location it is fitted in. Car amplifier that are fitted under a car seat or in tight spaces often overheat because the metal heat sink can't get rid of the heat. Place the car amplifier on the back of the car seat in the trunk is the best spot because it can breathe and also vibrations from the subwoofer box wont damage it. My personal recommendation is to never mount a subwoofer amplifier to a subwoofer box if you listen to your bass loud because overtime the components soldered onto the circuit board will become bad from all the shaking. You can also prevent your car amplifier from overheating by adding a cooling fan onto it. This will blow cold air directly onto it to prevent your car amplifier from shutting down.
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