Side Mirror Grinding, Clicking or Buzzing? What Each Sound Means
By Duber, The Car Mirror Man · Car Mirrors Australia · Updated October 2026 · 12 min read
Short answer: a grinding, clicking or buzzing mirror is almost always a small motor or its gears, not the whole mirror. Grinding usually means worn gears, clicking means the gears are slipping, buzzing means the motor runs but nothing moves, and silence means no power is getting through. The fix is usually one part.
In Melbourne? We can replace just the motor at your home or work, anywhere across the metro — see our full Melbourne mirror service.
A power mirror has a small electric motor behind the glass. When you press the switch or fold the mirror, that motor drives a set of gears. When something wears or breaks, the mirror tells you by sound before it fails completely.
This guide helps you read what you hear. It covers the four most common sounds, a two-minute check you can do without tools, what not to do, and what usually needs replacing.
The four parts, and what each one costs
A side mirror is four separate components. Which one broke is what decides the price — not the badge on the car.
What is inside a power mirror
Remote adjustment on most cars is done by small geared electric motors [1]. You press the switch, the motor turns, the gears reduce the speed, and the glass tilts a few degrees. Mirrors that fold often have a further motor and gear set for the folding movement [1].
That is a lot of small plastic and metal parts packed into a housing that sits outside the car in sun, rain and wind. It is no surprise that the gears wear, or that the motor gives up.
Four sounds, four likely causes
| What you hear | What it usually means | What we usually replace |
|---|---|---|
| Grinding | Worn or stripped gears inside the motor unit | The motor and gear unit |
| Clicking | The motor is turning but the gears are slipping | The gear set or motor unit |
| Buzzing or whirring | The motor runs but the glass or arm is not moving | The motor unit, or a stuck part |
| Nothing at all | No power is reaching the motor | A fuse, switch, wiring or the motor |
Those are the usual patterns, not a certain diagnosis. A mirror that was knocked can make the same noises as a mirror that wore out. That is why a photo, and sometimes a short description of when it started, helps us tell which it is.
A two-minute check, no tools needed
Before you call, this check tells you a lot. You are not repairing anything. You are listening and watching.
Most mirrors need the ignition on to adjust or fold.
Press up, down, left and right. Note which one makes the noise, or does nothing.
If the mirror folds, fold it in and open it out. Listen for the sound and watch for stopping halfway.
If only one side is wrong, it points to that mirror. If both, the switch or fuse is more likely.
Write down what you found. Which direction, what sound, one side or both. That is more useful to us than a guess at the part.
What not to do
The same goes for taking the housing apart. A mirror has clips, wiring and a glass that can crack on removal. For a job most people do once, the risk is not worth it. Send us the photo instead.
Is it the motor or the whole mirror?
Most of the time, one part has failed and the rest is fine. The mirror shell, the glass and the base are often undamaged.
This is the question that decides the price. A powered repair sits in the $350 to $500 band, against a plain assembly at $200 to $350. For any given car, we quote a fixed price per vehicle once we have seen the photo.
| What is broken | Typical cost |
|---|---|
| Mirror glass only | From $135 fitted |
| Cover or cap | $150–$300 |
| Plain assembly | $200–$350 |
| Powered assembly | $350–$500 |
| Blind-spot, camera or auto-dim | Quoted per vehicle |
Every band above comes from our national price guide, which is the single source of truth for what we charge. If you want the full breakdown by part and by vehicle, read our side mirror replacement cost guide.
Why a noisy mirror is worth fixing early
A mirror that grinds will usually get worse. The next step is a mirror that will not adjust, or will not fold. A mirror stuck in the wrong position can leave you with a poor view, and the mirror itself has to give a correct view to meet the standard it is built to [2].
A mirror that will not fold also loses the protection folding gives when the car is parked. If you park on narrow streets, that matters.
If the mirror has stopped adjusting altogether, our guide on mirrors that will not adjust electrically goes through that fault in more detail.
Why mirror motors wear out
A mirror motor is small, and it sits in the most exposed part of the car. It is a long way from the engine bay and gets no shelter.
None of that is a design flaw you did anything to cause. It is simply what happens to a small moving part that lives outdoors.
What a mirror motor repair involves
The motor and gear set sit behind the glass, inside the housing. To reach them, the glass comes off first, and then the motor unit is replaced and the glass goes back on.
It is clipped on, and has to come off carefully so it does not crack.
The faulty unit is unplugged and the new one fitted and connected.
Clipped back into place and set to the right angle.
Adjust in all four directions, fold and unfold, and heat or indicator where fitted.
It is a job that takes care more than force. That is another reason to leave a stuck mirror alone until it can be looked at.
When the noise is only part of the story
Sometimes the noise is not the real fault. A mirror can make a noise because the glass is loose, because a clip has let go, or because the housing has a crack that lets it vibrate. That is why we ask for a photo along with a description. A mirror that was hit might need the base or joint repaired as well as the motor.
When does it happen? A guide by situation
When the noise happens can be as useful as what it sounds like.
| When you hear it | What it can point to |
|---|---|
| Only when you adjust the mirror | The adjustment motor or its gears |
| Only when you fold or unfold it | The folding motor or its mechanism |
| Only on one side | That mirror's motor, rather than the switch or fuse |
| On both sides at once | The switch or a shared fuse is more likely |
| Only on a cold morning | A worn part that moves more freely once it warms up. It is still worth checking |
| After a knock or a wash | A part that has shifted or cracked, and worth a photo |
These are patterns we see, not a diagnosis. The photo and your description decide what we actually fit.
Questions to ask yourself before you call
Driver side, passenger side, or both.
Adjusting, folding, or both.
Grinding, clicking, buzzing, or nothing.
Suddenly after a knock, or slowly over time.
Four answers, and you have given us nearly everything we need. The photo does the rest.
Which sounds are normal
Not every noise is a fault. A power mirror makes a short, quiet motor sound while it moves, and that is normal. The difference is in what the sound does.
| What you hear | Usually normal? |
|---|---|
| A short, smooth whirr while the mirror adjusts | Yes |
| A short, smooth whirr as the mirror folds in or opens out | Yes |
| A rough or scraping grind | No. Worth a photo |
| Repeated clicking that does not move the glass | No. Worth a photo |
| A buzz that carries on after the mirror stops | No. Worth a photo |
If the sound is smooth and the mirror does what you asked, there is nothing to do. If the sound changes, or the mirror stops short, that is the time to send us a photo.
How long can you leave it?
A mirror that grinds will often still work for a while, so it is tempting to leave it. The risk is that it fails at a bad moment, with the glass stuck in the wrong position, or a mirror that will not fold out when you need it.
There is no fixed deadline. Our advice is simple: if the sound is new, get a quote. It costs nothing to send a photo, and a motor replaced early is a smaller job than a mirror that has stopped completely.
The short version
A new noise is the mirror asking for attention. Answering it early is the lowest cost way to keep the mirror working.
What our customers say
Finding the exact fault before quoting is what keeps the job to one visit.
Every review quoted on this site is a real, verified customer review. We do not write them and we do not edit them.
How we fix it at your car
Which direction, what sound, one side or both.
The motor, the gear set, the base or the whole assembly, and a fixed price.
Across the Melbourne metro, at home or work. Most jobs take 20 to 40 minutes on site.
Adjust, fold, heat and indicator, where your mirror has them.
If only the motor has failed, we replace the motor and leave the rest of the mirror alone. That is the lowest cost correct fix.
We come to you in five cities
Every job is mobile. We drive to your home, your work or the car park the car is sitting in, and the mirror is fitted and tested before we leave.
Frequently asked questions
Why is my side mirror making a grinding noise?
Usually worn or stripped gears inside the small motor that adjusts or folds the mirror. The mirror often still works for a while, but it tends to get worse.
What does a clicking side mirror mean?
Often the motor is turning but the gears are slipping, so the glass or arm does not move as it should.
Why does my mirror buzz but not move?
The motor is usually running, but something is not moving. It can be a worn gear, a stuck part or a loose connection.
What if I hear nothing at all?
That can mean no power is reaching the motor. A fuse, a switch, wiring or the motor itself could be the cause.
Do I need a whole new mirror?
Often not. Many noisy mirrors need only the motor or gear set replaced, and the shell and glass can stay.
Can I fix it myself?
We would not recommend it. A mirror has clips, wiring and glass that can crack, and forcing a stuck motor can make the fault worse.
How much does it cost?
Powered repairs sit in the $350 to $500 band, and we quote a fixed price per vehicle once we have seen your photo.
Can you do it at my home or work?
Yes. We fit it at your car across the Melbourne metro. Most jobs take 20 to 40 minutes on site.
More on Melbourne mirrors
Based in Melbourne? These cover the rest of it.
Sources
- Wing mirror, Wikipedia: how remote adjustment is done by geared electric motors, and how many mirrors also fold — en.wikipedia.org/wiki/Wing_mirror
- Australian Design Rule 14/02, Rear Vision Mirrors, Federal Register of Legislation: the requirements a mirror must meet to give a correct view — www.legislation.gov.au/F2006L02663/latest/text
Prices and information in this article are indicative only and reflect real quoted jobs at the time of publication. Costs vary with vehicle, part availability and features. Send a photo for an exact fixed price.
