I have a Godox flash with a built-in radio trigger, and I honestly can't figure out what I'm doing wrong. I've checked that:

  • All the batteries in everything are good and everything's turned on.
  • The radio transmitter is seated fully forward into the camera hotshoe and that all the pins on the flash foot are meeting the contacts in the camera hotshoe.
  • Both the transmitter and flash use the same channel.
  • The flash is in slave mode.

But the flash isn't firing when I push the shutter button. What else should I check?


Here's a list of common things to check.

Are you using the wrong slave mode?

For your speedlight to be a radio slave, the antenna icon must be showing, and the backlight should be orange.

Godox's TT685 and V860II speedlights for Canon, Nikon, and Sony have five different syncing modes that the horizontal lightning bolt button cycles you through:

  • On-camera mode (no wireless): no icon, green backlight
  • "smart" optical master: lightning bolt icon, green backlight
  • "smart" optical slave: lightning bolt icon, orange backlight
  • radio master: antenna icon, green backlight
  • radio slave: antenna icon, orange backlight

The V1, V860 III, TT685 II, and the TT685/V860II for Fuji, Olympus/Panasonic, and Pentax only have three modes:

  • On-camera mode (no wireless): no icon, green backlight
  • radio master: antenna icon, green backlight
  • radio slave: antenna icon, orange backlight

It's easy to confuse the optical and radio modes, or to mistake the on-camera mode for radio master. Pay attention to the absence/presence of the sync mode icon on the LCD, as well as the color of the backlight.

On the TT350/V350 mini speedlights the backlight is always orange, there are no "smart" optical modes, and the antenna icon and S/M indicator is in the lower left corner of the LCD. Swapping modes is done with the SYNC button and dial. Confusingly, the SLAVE button on the TT350 is only good for the "dumb" S1/S2 modes when the flash is set for on-camera use in M mode.

Do the ID code settings match?

With the XPro transmitter, Godox introduced a feature called "wireless ID". This apes the PocketWizard Custom ID feature (though without PocketWizard's guaranteed unique code), where an additional digital code is used to filter out signals from other nearby trigger users on the same channel to prevent them from popping off your lights.

With newer Godox triggers, the ID is set with the MENU button and setting the ID custom function. 00 or OFF turns off the feature. 01 to 99 are the possible values for the ID code, and the code must be identically set on all units for the system to work.

All the Godox TTL-capable gear: speedlights, AD lights, X1-R receiver, and transmitters can use ID codes, but may require a firmware update to have the feature. With the TT600/V850II, AC-powered monolights, or XTR16/XTR16s receivers, the ID on the transmitter must be set to 00 or OFF for the flashes to trigger.

See also: How do I tell if my Godox trigger or flash needs a firmware update?

Is your camera's flash mode set properly?

Check that you don't have flash disabled in your camera menus.

Also, at this time, AFAIK, the only camera menu system that has full two-way communication with Godox gear is Canon. It's not uncommon with non-Canon gear for flash control mode settings to be grayed out when a Godox flash or transmitter is on the hotshoe.

On all other systems, despite the fact that you're using a wireless flash, you don't want to use your camera's menus for wireless flash settings, which are for their proprietary optical wireless system. You pretty much want the camera to think the transmitter on the hotshoe is just an OEM speedlight.

With Sony cameras, it's also recommended that you set the flash mode on the camera to "Fill Flash" to get Godox gear to work properly.

Are you using the right radio trigger(s)?

The X2T cannot be used as a receiver on the foot of an off-camera flash. Godox only makes transmitter/receiver (Tx/Rx) sets. They do not make any transceiver units that can play either role. The hotshoe up top is for putting a non-Godox speedlight (or an AD200 extension head) on top of the transmitter for on-camera use.

There is a Flashpoint SPT manual-only transceiver unit that allows for sync and group control, but it's an Adorama exclusive (not a rebrand) and has no Godox-branded counterpart, so its availability outside the US is very low and generally costs twice as it does in the US.

The only Godox dedicated receiver unit in the system in the X1R, which only comes in Canon, Nikon, and Sony flavors. It will work with other brands, but as a manual-only trigger; it does not work for cross-brand TTL/HSS like the built-in transceivers in Godox's speedlights.

The Godox FC-16 Tx/Rx triggers are not compatible with the X system, despite being 2.4 GHz.

Are you using silent/electronic shutter?

With mirrorless cameras, electronic shutter modes often disable flash. This is because the way that line-by-line readout is done lowers the sync speed to very slow values (e.g., 1/15s). To enable the flash, turn off silent or electronic shutter modes.

EFCS (electronic first/front curtain shutter) won't disable flash, but may reduce your sync speed or cause banding with HSS.

For more details on how electronic shutter affects sync speed see: dpreview's "Electronic shutter, rolling shutter and flash: what you need to know".

Did you try a different channel?

Godox gear operates on the 2.4 GHz band, which is where nearly everything else wireless operates. There may be no way around an interference issue if you can't switch your location, but try changing the channel you've chosen

Are you using the flash and transmitter close together?

There is a bug in Godox's radio gear that prevents a radio connection if the transmitter and receiver units are used within one meter of each other. You have to set "close mode" on the transmitter to achieve sync.

For more details, see: How do I get my Godox trigger and flash to work close to each other?

  • Thanks for this. The ID code was the issue on mine. I had to set it to off as I have not patched my 350s. It was driving me nuts.
    – user85944
    Jul 23 '19 at 4:27
  • The lightning bolt vs antenna icon tip for the TT685 fixed it for me, thanks a bunch!
    – DLH
    Mar 4 '20 at 19:42
  • Gold! Thank you! Apr 8 '20 at 17:50
  • @Yorkshireman You're welcome!
    – inkista
    Apr 8 '20 at 22:58

Must be your wireless id. Your checked everything else inclucing the channel. The one thing everyone forgets is the id#.

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