Mac not connecting to 5GHz? Find out why it sticks to the slow band.

Your MacBook Pro, MacBook Air, or desktop Mac connects to 2.4GHz but ignores the faster 5GHz network. WiFyi helps you see which bands and channels are available, check if your router is actually broadcasting 5GHz, and diagnose why your Mac might be avoiding it.

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WiFyi channel scan showing 5GHz band availability and networks on Mac

What this issue usually means on a Mac

When a Mac connects to 2.4GHz but not 5GHz, the problem is usually one of three things: the router is not broadcasting 5GHz, the Mac is too far away for stable 5GHz signal, or macOS is choosing 2.4GHz because it appears more reliable. Understanding which scenario you are in determines the fix.

A practical way to narrow it down on your Mac

01

Scan to confirm 5GHz is broadcasting

WiFyi shows all networks it can detect on both bands. If your router 5GHz network does not appear in the scan, the router may have 5GHz disabled, or the Mac is too far away to pick up the weaker 5GHz signal.

02

Check the 5GHz channel your router uses

Some 5GHz channels (DFS channels 52-144) require radar detection and may not be available in all regions or on all routers. If your router is on a DFS channel, older Macs or certain configurations may not connect.

03

Compare signal strength between bands

5GHz has shorter range than 2.4GHz. If the 5GHz signal is weak (-75 dBm or worse) while 2.4GHz is strong, macOS may prefer the more stable 2.4GHz connection automatically.

04

Check if the router uses separate or combined SSIDs

If your router uses the same network name for both bands, macOS decides which to join. If it uses separate names (like "HomeWiFi" and "HomeWiFi-5G"), you can force the Mac to join the 5GHz network directly.

WiFyi channel scan showing both 2.4GHz and 5GHz bands with available networks on Mac

How WiFyi Helps

See which bands your Mac can actually detect

The channel scan shows all networks on both 2.4GHz and 5GHz, so you can confirm whether your router 5GHz network is visible to your Mac.

  • Both bands scanned in one view
  • 5GHz networks and channels clearly shown
  • Verify router is broadcasting before troubleshooting the Mac
WiFyi popover showing current Wi-Fi band, channel, and signal strength on Mac

How WiFyi Helps

Check which band your Mac is currently using

The popover shows your current connection details including band and channel, so you can verify whether you are on 5GHz or stuck on 2.4GHz.

  • Current band and channel at a glance
  • Signal strength to gauge 5GHz viability
  • Quick check without opening Network settings
WiFyi radar mode showing 5GHz signal strength in different locations

How WiFyi Helps

Find where 5GHz signal is strong enough

If 5GHz works in some spots but not others, radar mode helps you map where the signal is strong enough for a stable connection.

  • Walk around to find 5GHz sweet spots
  • Compare signal quality by location
  • Decide whether to move the router or your desk

Use the diagnosis to fix the right thing

If 5GHz does not appear in the scan

Log into your router admin panel and verify 5GHz is enabled. Some routers disable it by default or turn it off after firmware updates. Also check if the router supports 5GHz at all.

If 5GHz signal is too weak

Move closer to the router or reposition the router for better 5GHz coverage. 5GHz does not penetrate walls as well as 2.4GHz, so line of sight matters more.

If the router uses a combined SSID

Consider splitting the 2.4GHz and 5GHz networks into separate names in your router settings. Then connect your Mac specifically to the 5GHz network and set it as preferred.

If the router uses DFS channels

Try switching the router to a non-DFS 5GHz channel (36, 40, 44, or 48). These channels are universally supported and do not require radar detection that can cause connection delays.

Keep digging if the problem looks slightly different

Wi-Fi Interference on Mac

Figure out if interference from neighbors, Bluetooth, or household devices is causing your Mac Wi-Fi problems.

Best Wi-Fi Channel on Mac

Scan nearby networks from your Mac, compare channel crowding, and pick a cleaner 2.4 GHz or 5 GHz channel for your router.

Slow Wi-Fi on Mac

Figure out why Wi-Fi is slow on your MacBook or desktop Mac without guessing between signal, router, DNS, and ISP issues.

Frequently Asked Questions

macOS automatically chooses the band it considers most reliable. If 5GHz signal is weak or unstable, the Mac may prefer 2.4GHz. Other causes include the router not broadcasting 5GHz, the router using DFS channels your Mac avoids, or the networks sharing the same SSID so you cannot force 5GHz.
The most reliable way is to give your 5GHz network a separate name in router settings, then connect your Mac to that specific network. You can also go to System Settings > Network > Wi-Fi > Advanced and drag the 5GHz network to the top of the preferred networks list.
Phones and Macs have different Wi-Fi antennas and may pick up signals at different strengths. If your phone sees 5GHz but your Mac does not, the Mac may be slightly farther away or in a worse position relative to the router. Try moving the Mac closer or repositioning the router.
DFS (Dynamic Frequency Selection) channels (52-144 in the 5GHz band) share spectrum with weather radar and require devices to detect radar before transmitting. Some older Macs or certain macOS configurations may have trouble with DFS channels. Switching your router to channels 36-48 avoids this issue.
Not always. 5GHz offers more bandwidth and is usually less congested, but it has shorter range and weaker wall penetration. If you are far from the router, a strong 2.4GHz signal may actually perform better than a weak 5GHz signal.

Check if your Mac can see 5GHz — and why it might not.

Your Mac connects to 2.4GHz but ignores 5GHz. Scan to see if 5GHz is available, check signal strength by band, and find out why macOS picks the slower network.