How to Fix Fret Buzz

Diagnose it by where it happens — that's the whole trick.

"My guitar buzzes" is the most common complaint in guitar setup, and the most fixable. The key insight most guides miss: where the buzz happens tells you what's causing it. Buzz on open strings has a completely different cause to buzz above the 12th fret. Find your symptom below and work through the fix.

Open strings only

The test: put a capo on the 1st fret. If the buzz stops, the nut is your problem — the capo lifts the strings clear of the nut entirely, bypassing it.

If the capo fixes it: nut slots are too low

The grooves in the nut have been cut too deep or worn down, so the string rattles against the first fret when played open. If it's just one or two strings, ask yourself whether you recently changed string gauge — a lighter string can rattle in a slot cut for a heavier one.

• A tech can shim the nut or fill and re-cut individual slots — quick and cheap (a full nut replacement is usually $30–60 including labour).
• Temporary workaround: a tiny piece of card stock under the string in the slot.
• Real luthier trick: a drop of super glue mixed with baking soda in the slot, cured overnight, then re-filed.

If it still buzzes with the capo: back-bowed neck

The neck is curving backward instead of forward, so the strings ride along the fret tops with no clearance. It sounds scary but it's usually a simple truss rod fix: loosen the truss rod a quarter turn anti-clockwise (from the headstock end), wait 20–30 minutes for the neck to respond, retune, and re-check. You may need two or three quarter turns spread over a day. See the truss rod & neck relief guide for the full method.

First 5 frets

Same capo test: if a capo at the 1st fret stops the buzz, it's a nut slot issue. Confirm by capoing the 3rd fret and looking at the gap between the string and the 1st fret — you want barely visible daylight. Zero gap means the slot is too deep.

If the capo doesn't fix it, check your neck relief. A neck that's too flat (or slightly back-bowed) puts the strings too close to the frets in the low positions. The target is a 0.25mm (0.010") gap at the 8th fret, measured with a capo at the 1st fret and the string held at the last fret. Less than that, and the truss rod needs loosening a quarter turn. Necks drift with humidity and temperature — this is normal maintenance, not damage.

Relief in spec and nut fine? Suspect a worn or high fret — frets wear fastest in the first positions where most chords live. Rock a short straight edge (or credit card edge) across three frets at a time: if it seesaws, the middle fret is high.

Middle frets (5–12)

Buzz across a range of middle frets is the classic signature of too little neck relief. String vibration is widest in the middle of the neck, so a too-flat neck buzzes here first — and wound strings (E, A, D) go first, because they swing wider than plain strings.

1. Capo the 1st fret, hold the low E at the last fret.
2. Measure the gap at the 8th fret. Target: 0.25mm (0.010"). Under 0.15mm means you need more relief.
3. Loosen the truss rod a quarter turn anti-clockwise (from the headstock).
4. Wait 10–15 minutes, retune, re-measure. Repeat until you're in the 0.20–0.30mm range.

Buzz at one specific middle fret instead? That's a high or worn fret — see the straight-edge check above. A single high fret can be levelled and re-crowned by a tech without touching the rest of the neck.

Upper frets (12+)

Recently lowered the action, or a new guitar?

The action is simply too low for your playing intensity. What sounds clean when you pick gently will rattle when you dig in. Measure at the 17th fret (Fender spec: 1.6mm / 4/64" for both E strings) and raise the saddles a quarter turn at a time until the buzz clears. Full method in the action height guide.

Was fine before, buzzes now?

Many bolt-on necks develop a slight hump where the neck meets the body (around frets 14–16) — the heel rises over time from string tension and humidity. The truss rod can't fix a localised bump. Confirm with a straight edge from fret 12 to the last fret, check the neck bolts are tight, and if the hump is real, it's a tech job: a targeted fret level or a neck-pocket shim.

Old wound strings also cause upper-fret buzz — kinks and flat spots make them vibrate unevenly, and the short vibrating length up high is unforgiving. Fresh strings are the cheapest diagnostic there is: if the buzz vanishes, you're done.

Buzzing everywhere

Did you change string gauge?

That explains it. Lighter strings pull less on the neck, so the neck straightens, action drops, and everything buzzes. A guitar's setup is calibrated to specific strings — changing gauge means re-checking the chain: relief, then action, then intonation. It takes 30–45 minutes once you know the correct setup order.

Came on gradually?

Seasonal neck movement. Wood shifts with humidity — dry winter air back-bows necks (more buzz), humid summers bow them forward (higher action). Every guitar needs this adjusted occasionally; it's physics, not a defect. Do a full relief → action → intonation refresh, and consider a case humidifier if your climate is dry (40–60% relative humidity is the happy zone).

Sudden, with no obvious change?

Usually several small things compounding — a slightly moved neck plus ageing strings plus action already on the low side. Go systematic: fresh strings first, then relief, then action, then check for loose hardware (neck bolts, saddle screws, tuner bushings, trem springs — loose parts cause sympathetic rattles that masquerade as fret buzz).

More guides: Setup order · Truss rod & neck relief · Action height · Intonation