You plugged in the right cable, your TV and soundbar both claim to support eARC, and you're still getting no sound, dropouts, or a compressed downmix instead of real Dolby Atmos. Almost every eARC failure comes down to one of a handful of causes — here's how to actually find and fix yours, in the order most likely to be the culprit.
This is the single most common cause, and the easiest to miss. Almost every TV has exactly one HDMI port wired for eARC — it's usually printed on the back panel as "HDMI (eARC)" or sometimes just "ARC." Every other HDMI input on the TV is a standard input only; plugging your soundbar or receiver into any of them gets you no audio return signal at all, full stop, regardless of any setting you change.
Physically trace the cable from your soundbar or receiver back to the TV and confirm it's in the labeled eARC/ARC port, not just "a port that looked free." This single check resolves a surprising share of "eARC isn't working at all" cases.
Both the TV and the receiver or soundbar need eARC turned on in their own settings menus — plugging into the right port isn't enough on its own. On most TVs, this lives somewhere like Settings → Sound → HDMI eARC or buried inside the HDMI-CEC settings (sometimes labeled "Anynet+," "Bravia Sync," "SimpLink," or similar depending on brand). On the receiver or soundbar side, check for a setting usually called "ARC," "eARC," or "TV Audio" that needs to be switched on rather than left on an older ARC-only mode.
Both ends need eARC, not just one. A TV with eARC connected to a receiver that only supports standard ARC will fall back to ARC's lower bandwidth automatically — check both devices' actual spec sheets if you're not sure which one is the limiting factor.
This is the usual cause when eARC is clearly connected and recognized, but you're not getting Atmos or DTS:X — just a stereo or basic 5.1 downmix. The TV's digital audio output setting needs to be set to "Auto," "Bitstream," or "Dolby Digital/DTS passthrough" rather than a fixed "PCM" setting. A PCM-locked output re-encodes everything to a basic stereo or 5.1 signal before it ever reaches the eARC port, which strips out any object-based Atmos or DTS:X data entirely — the eARC connection itself can be working perfectly and you'll still never hear real Atmos.
Menu wording and exact location shift between model years, but the underlying setting name is consistently some variant of "digital audio output format" — look for it specifically rather than the general volume controls.
eARC rides on the same HDMI-CEC communication layer that handles things like your TV remote turning on a soundbar automatically. If CEC is disabled, flaky, or conflicting with another connected device trying to grab control, eARC can intermittently drop or fail to negotiate at all. Try toggling CEC off and back on (under whatever brand name it's hiding behind — Anynet+, Bravia Sync, SimpLink, Viera Link) on both the TV and the receiver/soundbar, and power-cycle both devices afterward.
eARC itself needs meaningfully less bandwidth than 4K/120 video or 8K passthrough — nowhere near HDMI 2.1's full 48Gbps ceiling. That means most existing HDMI cables, even older ones, carry eARC data fine. A damaged or genuinely low-quality cable can still cause intermittent dropouts, so it's worth trying a different cable if everything above checks out and the problem persists — but it's rarely the actual cause, and swapping the cable first just burns time that's better spent on the settings above.
If you do want a cable that's certified and known-good regardless of eARC specifically, see our certified HDMI cable picks.
If eARC was working fine and then suddenly stopped after your TV, receiver, or soundbar auto-updated its firmware, that's not a coincidence. Firmware updates occasionally reset HDMI-CEC and audio-output settings back to factory defaults, silently undoing whatever you'd configured. Walk back through Steps 2 and 3 above after any firmware update rather than assuming your settings survived it.
Almost every "eARC isn't working" case is a settings or port problem, not a hardware failure or a bad cable.
If you've worked through every step above and it's still broken, two things are worth trying before assuming a device is faulty:
If none of that resolves it, a standard optical digital cable is a reliable fallback — it won't carry full lossless Atmos or DTS:X, but it reliably carries compressed 5.1 formats like standard Dolby Digital while you troubleshoot further or wait on a firmware fix from the manufacturer. See our soundbar vs. surround system guide if you're weighing whether to simplify the whole setup instead.