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Old 04-11-2021, 08:00 PM   #1
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Trailer lights stay on when engine off-2021 GMC Sierra

Trailer lights will not go off even after 10 minutes after engine shutoff. Cleaned the connector (sanded the slots and used electronic cleaner), issue persists. I connected to another vehicle, and works fine, which tells me issue is on the truck side. I suspect something in the sophisticated trailering technology. I do have the transparent trailer camera, and it works fine.

Anybody else ran into this issue?
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Old 04-11-2021, 08:14 PM   #2
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When this happens, is the vehicle fully powered down / key fob located outside and away from the vehicle?

Or in other words, is ACC on or is power on in the vehicle when the lights stay on?

This link may help.

https://gm-techlink.com/?p=12721

(love how in this tech article GM took the liberty to re-brand an airstream. )
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Old 04-11-2021, 08:26 PM   #3
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I have the problem that I forget to turn on the running lights in daylight: they aren’t on when simply plugged in, you have to turn the headlight control off of auto to park to get them to come on....

Could it be, the park lights are being left on? Just turn it back to auto?
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Old 04-12-2021, 02:05 PM   #4
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I did some more testing on my light situation, to no avail, trailer lights stayed on with:

- headlights on auto and on off
- truck off, locked, and key fob far away from truck
-cleaned connecter and pins again, and with baking soda
- wiggled connector around a lot

I connected my truck to my boat, which is wired with a 4-way flat and a round adaptor, and same thing, trailer lights stay on. When hooked to the boat I did get a running light problem prompt on the trailering app, and it even highlighted the problem pin (the one in the 1 o'clock position). But that error message does not show up when hooked to the Airstream.

I then connected another vehicle to the Airstream again, and the trailer lights went off properly. So as I surmised before, the problem appears to be in my truck, either in the technology or the female port where the connector plugs in. Not sure where to go from here, any advice welcomed. I sure don't want to have unplug my trailer every time I stop to get the lights to go out.
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Old 04-12-2021, 03:17 PM   #5
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I have not; my 2020 Sierra does not have the transparent trailer bits, just the in-dash app that can monitor your tires, check your electric connections... (I take it, running the test, everything is working?).

I'd have to see what the dealership says about it....
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Old 04-13-2021, 09:09 AM   #6
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I realize yours is a 2021, but I did come across this for reference, might help when discussing with the dealership:

https://www.gm-trucks.com/have-a-201...-gm-has-a-fix/
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Old 04-14-2021, 06:31 AM   #7
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Thanks LN, I had not seen that particular bulletin. When I called the dealer the other day he said they had heard of the flashing lights issue but did not have a fix. Even though mine do not flash but stay on, could be same root cause (trailer pulling more amps than truck module allows). But issue happens on my boat trailer too which only has two Led tail lights, so doubt it is pulling more than 9 amps. I will send this to them and see what they say. Thanks.
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Old 04-14-2021, 08:39 PM   #8
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Trailer lights stay on when engine off-2021 GMC Sierra

Quote:
Originally Posted by driftwood1;
Thanks LN, I had not seen that particular bulletin. When I called the dealer the other day he said they had heard of the flashing lights issue but did not have a fix. Even though mine do not flash but stay on, could be same root cause (trailer pulling more amps than truck module allows). But issue happens on my boat trailer too which only has two Led tail lights, so doubt it is pulling more than 9 amps. I will send this to them and see what they say. Thanks.


Could be it. From the TSB in the link above:

Quote:
That high voltage may also illuminate LED lights despite trailer theft deterrent not being active.
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