Recommended PWM Filter to Address Running Light Error on Trailer Pulled by a GM Truck

Updated 12/24/2025 | Published 01/14/2023

Question:

I have a 2022 GMC 2500 with the camera problem. I bought the Furrion adapter and the camera works but my screen still reads running light error. This Voyager part VGR64VR seems like it would work but unlike several of your installation videos I have a 2023 Grand Design Reflection. Do you have any idea if there would be anything prohibitive in the wall that would create installation problems?

asked by: Henry K

Expert Reply:

You are correct the 12V PWM Filter for RV Backup Camera Systems item # VGR64VR will solve your problem. The PWM Filter is basically a capacitor that provides your camera with the necessary power that GM has decided not to provide through their 7-Way connector.

I have not heard of any issues that would cause this filter to not work correctly with the new 2023 Grand Designs. I have linked an installation video we did on this part below. It's on a different trailer abut the steps will be the same.

expert reply by: Jerred H

Todd

10/13/2025

So I installed a PWM filter in my junction box on the trailer to cover all 3 of my cameras that run on the running lights circuit. The cameras work great but my 2024 Silverado keeps telling me to check the running light wiring. Presumably because it doesn’t get a return signal due to the filter. Is there a fix or is that just a lesser of 2 evils problem? The running lights are working perfectly well.

Jerred H.

10/13/2025

@Todd That's definitely a new one. You can check the connections and see if somethings lose or your 7-ways dirty but another cause for that warning message on a 2024 Silverado is a recall on the trailer connector due to voltage issues.

Todd

10/13/2025

@JerredH It only happens with the PWM filter connected. If I disconnect it the trailer running light test works fine but the camera no longer works. In either case the actual running lights work fine.

Jerred H.

10/15/2025

@Todd That's good that it still works. Do you have the ability to or have you already tried connecting your truck to another trailer? Trying to run through the possible issues so we can get rid of that error message.