Headphones · AirPods
AirPods 5 ANC Not Working
If Active Noise Cancellation on your AirPods 5 isn't suppressing background rumble or is making a high-pitched squealing noise, dirt, poor fit, or mic mesh blockages are usually to blame.
Symptoms
- Ambient noise is amplified or muffled instead of cancelled when ANC is toggled on
- High-pitched squealing, whistling, or chirping sound when inserting or adjusting an earbud
- Active Noise Cancellation mode works in only one earbud while the other stays in Off mode
- Control Center shows ANC as greyed out or displays 'Keep Both AirPods in Ears' errors
- Low-frequency hum, wind-like rush, or static buzzing present whenever ANC is active
- Toggling between Transparency and ANC modes makes no noticeable difference in sound isolation
Quick troubleshooting
Step 1
Clean the external and internal acoustic mic meshes
Inspect the black mesh grilles on the outside and underside of each earbud under a bright light. Carefully remove wax or skin oil using a dry, clean cotton swab or a soft-bristled antistatic brush. Avoid pushing pointed metallic objects into the mesh, which can puncture the delicate waterproofing membrane directly beneath.
Step 2
Verify iOS settings and toggle mono ANC mode
Open Settings on your iPhone, select your AirPods, and verify that Noise Control is set to Noise Cancellation. Next, go to Settings > Accessibility > Audio/Visual > Headphones and ensure 'Noise Cancellation with One AirPod' is enabled if you often wear single earbuds. Toggle the feature off and on again to re-initialize the audio DSP.
Step 3
Perform a complete hardware unpairing and reset
Place both earbuds into the charging case and close the lid for 30 seconds. Open the lid, navigate to Bluetooth settings on your host device, tap the 'i' icon next to your AirPods, and select 'Forget This Device'. Hold the setup button on the back of the case for roughly 15 seconds until the status LED flashes amber then white, then re-pair them.
Step 4
Isolate hardware damage via individual earbud testing
Test ANC with one earbud at a time while listening to low ambient background noise like a fan. If one side creates severe static, chirping, or fails completely while the other operates cleanly, the internal microphone array or DSP chip on that side has sustained physical or liquid damage.
Likely causes
- Earwax, oils, or dust clogging the outward-facing microphone grilles
- Improper ear seal or loose physical fit in the ear canal
- Debris blocking the internal feedback microphone mesh near the speaker driver
- Outdated firmware or iOS bluetooth audio handshake glitch
- Single-ear ANC setting disabled in iOS Accessibility options
- Internal acoustic damage or diaphragm shift caused by drops or liquid exposure
What's going on
Active Noise Cancellation (ANC) on the AirPods 5 relies on a complex real-time balance between inward-facing and outward-facing microphones, acoustic seals, and specialized Apple silicon algorithms. Outward microphones detect incoming environmental sound, creating an inverted anti-noise waveform to neutralize background rumble before it hits your eardrum.
When ANC fails, you may notice persistent background hums, screeching feedback loops, or a complete lack of noise reduction. While a complete loss of ANC can feel like a hardware death sentence, it is frequently caused by simple acoustic blockage or software synchronization glitches.
Symptoms people notice
- Zero Noise Reduction: Background noise sounds identical whether ANC is turned on or off.
- Squealing or Whistling: Inserting or pressing on the earbud creates a sharp feedback loop sound.
- Hollow Wind Noise: A constant rustling sound inside the earbud, similar to blowing into a microphone.
- Uneven Isolation: One ear cancels noise properly while the other lets ambient sound leak in.
- Greyed Out Controls: iOS displays an error claiming both AirPods must be in your ears even when they are securely fitted.
Likely causes
- Microphone Mesh Blockage: Earwax, skin dust, or moisture build-up blocks the microscopic holes in the outer mic grilles, preventing external noise sampling.
- Acoustic Seal Breakage: If the earbud sit loosely, external noise bleeds past the stem, overwhelming the anti-noise phase matching.
- Firmware Mismatch: Out-of-sync firmware between the left and right buds or pending iOS audio stack updates.
- Damaged Internal Mic: Physical drops can displace the internal feedback microphone situated behind the main speaker driver.
- Liquid Ingress: Sweat or rain penetration drying onto the internal microphone diaphragm, altering frequency response.
Quick checks first
Before taking your earbuds apart or looking at hardware replacement options, go through these fast sanity checks:
- Check your fit: Ensure the earbuds are seated firmly in your ears. ANC requires a predictable acoustic seal to function properly.
- Wipe down all grilles: Use a dry microfiber cloth to remove oily buildup on the exterior dark meshes.
- Update your source device: Go to Settings > General > Software Update on your iPhone or iPad. Pending Bluetooth stack bugs are regularly patched in system updates.
- Check Accessibility toggles: Ensure sound balance is centered under Accessibility settings.
If you want step-by-step teardowns or detailed device specs, check our Apple AirPods 5 guide.
When it's a real repair
If you have thoroughly cleaned the microphone grilles and performed a full factory reset, but one earbud continues to squeal or pass unmodified ambient noise, you are dealing with a hardware-level failure. Drops can snap the delicate micro-solder joints connecting the MEMS (Micro-Electro-Mechanical Systems) microphones to the main logic board.
Similarly, corrosion from sweat intrusion will permanently damage the noise-sampling capsules. Because AirPods 5 assemblies are sealed with industrial structural adhesive, replacing individual internal microphones isn't feasible without destroying the outer plastic casing.
DIY vs professional repair
Opening modern AirPods is an extremely difficult task rated at the highest tier of repair complexity. Attempting to pry open the acoustic housing generally results in snapped flex cables, damaged lithium-ion batteries, and ruined cosmetic shells.
- DIY Scope: Non-invasive maintenance, mesh cleaning with solvent-free tools, software recalibration, and housing inspection.
- Professional Scope: Replacing defective individual earbud units or charging cases.
If cleaning doesn't resolve the symptom, review our general repair guides or read user feedback on repair reviews to weigh your options. When hardware fails, replacing the affected single earbud is usually the safest path.
Next steps
Start by thoroughly cleaning every visible mesh with a dry antistatic brush and performing a factory reset via the case button. If the ANC remains broken or keeps generating high-pitched feedback, check your warranty coverage with Apple or consult LML Experts to evaluate options for acquiring a single replacement earbud.
Next steps
Try the DIY guide if you're comfortable opening the device. Still stuck? Browse related problems for similar symptoms.
