How to Fix Google Assistant Not Working on Android

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Google Assistant stops responding for a handful of common reasons — most of which are fixable in under two minutes. Here’s what to check first, and what to do if it still won’t work.

Short Answer: The most common fixes: re-enable Hey Google detection in Assistant Settings, clear the Google app cache, check microphone permissions, and make sure your language setting matches what you’re speaking. If it worked before and suddenly stopped, a Google app update usually fixes it within a day.

Fix 1: Re-Enable Hey Google Detection

Android updates sometimes reset the “Hey Google” trigger. This is the most common reason for Assistant suddenly not responding to the wake word.

Open the Google app on your phone
Tap your profile picture in the top right → Settings
Tap Google Assistant → Hey Google & Voice Match
Toggle Hey Google on
Follow the prompts to re-train your voice model if asked

📸 SCREENSHOT NEEDED: Google Assistant settings showing Hey Google & Voice Match toggle being enabled

Quick re-enable:
Google app → Profile → Settings → Google Assistant → Hey Google & Voice Match → Turn on Hey Google

Fix 2: Clear Google App Cache

A corrupted cache causes all sorts of Google app issues including Assistant failures:

Go to Settings → Apps (or Apps & notifications)
Find and tap Google
Tap Storage & cache
Tap Clear cache
Restart your phone and try Assistant again

Note: Clear cache only — not storage. Clearing storage resets the app entirely and signs you out.

Fix 3: Check Microphone Permission

If Google Assistant opens but doesn’t hear you (the waveform doesn’t animate when you speak), the microphone permission may have been revoked:

Settings → Apps → Google → Permissions
Find Microphone and ensure it’s set to Allow while using app (not “Deny”)

📸 SCREENSHOT NEEDED: Android app permissions screen for Google app showing Microphone permission set to Allow

Fix 4: Update the Google App

Open the Play Store → tap your profile → Manage apps & device → Update all (or search for Google and update manually). Assistant issues after an Android update are frequently resolved in the next Google app update within a few days.

Fix 5: Check Language and Region Settings

Google Assistant works best when your phone language, Google account language, and Assistant language all match. If you changed your phone language recently:

Google app → Settings → Google Assistant → Languages
Make sure your primary language is set correctly
Remove any secondary languages if they’re causing conflicts

Fix 6: Re-Enable Voice Access on the Lock Screen

If Assistant works with the phone unlocked but not from the lock screen:

Google app → Settings → Google Assistant → Hey Google & Voice Match
Enable Lock screen personal results

Fix 7: Factory Reset Assistant Settings

As a last resort, you can reset all Assistant settings to default:

Google app → Settings → Google Assistant
Scroll to the bottom → tap Assistant devices → Phone
Tap the three-dot menu → Remove this device
Set up Assistant again from scratch

Warning: Some phone manufacturers (Xiaomi/MIUI, Huawei/EMUI) restrict background activity aggressively. If Assistant stops working after the screen turns off, check Battery Settings → Apps → Google → Don’t restrict battery usage.

Quick checklist:

✅ Re-enabled Hey Google in Google app → Settings → Google Assistant
✅ Cleared Google app cache in Settings → Apps → Google → Storage & cache
✅ Verified microphone permission is set to Allow in app permissions
✅ Updated the Google app via Play Store
✅ Checked that phone language and Assistant language match

Frequently Asked Questions

Why does Google Assistant open but not respond to voice?

This is almost always a microphone permission issue or a corrupted voice model. Check the microphone permission (Fix 3) and re-train the Hey Google voice model (Fix 1) — one of these resolves it in most cases.

Does Google Assistant work without internet?

Very limited functionality without internet. Basic on-device actions (setting alarms, opening apps) work offline, but web search, smart home control, and most Assistant features require an active connection.

Google Assistant keeps saying “I don’t know how to help” — why?

Usually a language/region mismatch or a query that Google is declining (privacy-restricted info, no connected account). Check your language settings and make sure your Google account is properly signed in.

Can I replace Google Assistant with another assistant on Android?

Yes. Alexa and Samsung Bixby can both be set as the default assistant on Android via Settings → Apps → Default apps → Digital assistant app. On Samsung phones, Bixby and Google Assistant can coexist with different triggers.

Conclusion

Re-enabling Hey Google (Fix 1) and clearing the Google app cache (Fix 2) resolve the vast majority of Assistant issues. If neither works, the microphone permission check usually surfaces the remaining cause. Factory resetting Assistant settings is rarely needed but always fixes persistent problems.

For more Android help, see our guides on Android tips and tricks and the best Android apps.

More Android Tips ↗ ↗Best Android Apps

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