Car Stereo Not Working? 8 Common Causes and What to Check
Most car stereo faults come down to power, wiring, a setting or a failed unit. Start with the simple checks below, such as the fuse, the mute and source settings, and a restart. If the unit is old, keeps cutting out or has stopped responding entirely, replacing it is often the sensible fix. Stop and ask a professional if you are not confident working near car wiring.
1. No power at all
If the stereo is completely dead, check the fuse first. The fuse box location and the stereo fuse are listed in the car's manual. A blown fuse can have a cause, so if it blows again straight away, do not keep replacing it. A flat or recently disconnected battery can also stop the unit from starting.
2. No sound but the screen works
Check that the stereo is not muted, the volume is up and the right source is selected. Look at the balance and fader settings in case sound is pushed to speakers that are not working. If every speaker is silent, a failed built-in or external amplifier, or a loose speaker connection, is possible.
3. Crackling or one speaker missing
That usually points to a speaker or its wiring rather than the stereo. A blown speaker or a loose wire at the speaker or behind the unit is a typical cause.
4. Radio static or no stations
Check that the aerial is connected and undamaged. If you drive a Japanese import and cannot find many NZ stations, the radio may be tuned for a different FM range. See the NZ FM band expander guide.
5. The stereo cuts in and out
Loose power, ground or wiring behind the unit is a common cause, especially if the cut-outs happen over bumps. A poorly fitted wiring connection from an earlier installation can do this too.
6. Frozen or unresponsive screen
Turn the car off, wait a minute and restart. Some units have a reset button. Check the manual before using it, because it may clear your settings.
7. It asks for a code
Some factory stereos lock after the battery is disconnected and ask for an anti-theft code. The code is usually in the owner's manual pack or available from the dealer.
8. Bluetooth will not connect
Delete the phone from the stereo and the stereo from the phone, then pair them again. Make sure the phone's Bluetooth is on and that no other paired phone is connecting first.
When to replace the stereo
If the unit is old, has repeated faults, or you would like CarPlay, Android Auto, a reverse camera or better Bluetooth anyway, a new unit is often the better use of money than chasing faults. We fit new head units at your home or work anywhere in Auckland, usually in 1 to 2 hours, with a 2-year warranty. See how to choose a car stereo installer for what to ask.
Frequently asked questions
Why has my car stereo stopped working suddenly?
The most common reasons are a blown fuse, a loose connection behind the unit, a setting such as mute or source, or a failed unit. Check the simple things first.
Can I fix a car stereo myself?
You can check fuses and settings yourself. Opening the dash and working on wiring is best left to a professional, because mistakes can damage the car's electronics.
Is it worth repairing an old car stereo?
It depends on the fault and the age. For an old unit, a replacement often costs about the same as a repair and adds features such as Bluetooth and CarPlay.
Why does my stereo only get a few radio stations?
Weak aerial connections cause it, and so does a Japanese-import radio that tunes a different FM range. Our band expander guide covers the second case.