Forum Discussion
MyGMC Trailer Light Test
My GMC trailer light test functionality appears to have been removed or lost in the most recent update of the app - March 2025. I use this feature frequently. I called OnStar support today 3/9/2025 and they seemed confused regarding this trailer light testing feature. How do I get this trailer light test functionality restored in the app?
- Siochan71New Contributor II
I too noticed this today. I connected to my trailer and went to run the light test in the app like normal and it is nowhere to be found. I chatted online with an advisor and they seemed to not know what I was talking about. They suggested I uninstall and reinstall the app. The trailering functions in the app were very helpful.
- RcookieNew Contributor
Same here. No help at all.
- ChukkarNew Contributor II
I’m going to reach out to my dealership today to see if they can offer any insights. Additionally, I’m hopeful that OnStar will respond to these posted messages. The trailering features in the app were / are key to successful, convenient, and safe trailering using my GMC 3500HD truck. If this turns out to be a deliberate OnStar / MyGMC decision to permanently remove the trailering features from the app, after these features being operational for over 6+ years, I’ll be canceling my OnStart account.
I’ll post again after I speak with the dealership.
- Siochan71New Contributor II
So frustrating. "simplifying" the user experience was having the bloody feature in the app. Now you have to initiate it from the infotainment system, run to the back of the trailer, meanwhile test is halfway finished by time you get to the rear of the trailer so have to wait for it to cycle through a second time.
I'm a recent addition to the GMC family, I've only owned my GMC Canyon for 7 months. In that time two features have been removed by GMC that I used. The first to go was the remote integration with Amazon Alexa. Now they've removed a very necessary feature from the app.
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