Reset a Frozen Infotainment Screen

Last updated: June 10, 2026

If the MBUX screen on your Mercedes CLA (C118, 2019–Present) has frozen, gone black, or stopped responding to touch and the voice assistant, you can force a soft reset yourself in under a minute — no tools, no garage, and without losing a single setting.

Which system the C118 uses

The second-generation CLA shares its platform and cabin tech with the W177 A-Class, so it runs MBUX from launch — the twin widescreen displays and the “Hey Mercedes” assistant. Early C118 cars used the first MBUX generation, which occasionally froze or hung on voice control before software updates matured. Whatever build you have, the soft reset is the same and it’s done from the steering wheel, not the screen.

Soft reset (reboot) the MBUX screen

Do this parked, with the ignition on so the system stays powered.

1. On the steering wheel, find the phone/answer button (left touch-control pad) and the voice-control button (the speech-bubble key).
2. Press and hold both together for about 15–20 seconds. Keep holding past any beep.
3. The central display goes completely dark, then the Mercedes-Benz logo reappears as MBUX reboots.
4. Release and wait 30–60 seconds for the home screen to reload. Touch, voice, and the controls should respond again.

If your trim uses the Favourites “star” and Telephone touch-controls, holding those two together for the same 15–20 seconds triggers the identical reboot.

Will this erase anything? No

The two-button MBUX reset is completely safe. It does not wipe radio presets, navigation favourites, paired phones, driver profiles, or your “Hey Mercedes” settings — the system simply reloads its software. Do it as often as you need.

If the screen stays frozen

• Hold longer. If 20 seconds did nothing, repeat and hold both buttons for a full 30 seconds before releasing.
• Cycle the ignition fully. Switch off, open the door, lock the car, and walk away for about five minutes so the electronics sleep; then unlock and restart.
• Check for a software update. Early C118 MBUX freezes were largely fixed by updates, delivered over the air via Mercedes me or flashed by a dealer.
• Unpair a problem phone. A flaky Bluetooth or CarPlay/Android Auto pairing can hang MBUX on boot — delete the device and pair fresh.
• Persistent blank screen? If the display stays dead even after resets, the LVDS/SHD data cable to the panel can be at fault on these cars — that one is a workshop job, not an owner fix.

Factory reset (erases data — rarely needed)

A factory reset is separate from the soft reset and only worth doing if you are selling the car or clearing a deep, persistent glitch. In MBUX it lives under System Settings → Reset (the “Reset” function). It erases presets, paired phones, profiles, and navigation history, so only do it deliberately.

Frequently Asked Questions

Which two buttons reset the CLA MBUX screen?

The phone/answer button and the voice-control button on the steering wheel, held together for 15–20 seconds. On some trims it’s the Favourites “star” and Telephone touch-controls — either pair does the same reboot.

Will I lose my settings or saved stations?

No. The soft reset keeps presets, navigation favourites, paired phones, and driver profiles. Only a deliberate System Settings → Reset clears them.

My 2020 CLA screen went blank and a reset didn’t fix it — what now?

If the display stays dead through repeated resets, it can be a software fault that needs a dealer flash, or a damaged data cable to the panel. Try a software update first; persistent blank screens need a workshop.

Is it safe to drive with the screen frozen?

Yes. MBUX is independent of the engine and driving systems — you only lose audio, navigation, and voice control. Reset it when you are safely parked.

Is the CLA reset the same as the A-Class?

Yes. The C118 CLA and W177 A-Class share MBUX, so the two-steering-wheel-button reset is identical on both.

If a warning light or fault message stays on the dash after the reboot, it may have stored a diagnostic trouble code — you can look it up on autodtcs.com.