Electrical issues with 2020 1500

FitzJJF2026 · 2026-11-11T16:57:07-0600

Hello everyone, new to this forum and 1st post. I live in southern Ontario Canada for reference.

Have a 2020 1500 5.3 crew cab purchased new. Stock, no modifications. In last couple of weeks, I started getting an intermittent hyper/rapid flash when right turn signal activated. Has a dashboard message saying right signal failure. It was very intermittent at first and could go days before it reappeared. With colder and damp weather its almost constant now.

Are there fixes other than replacing the entire light assembly?

Earlier this summer I had the rear camera activate when the brake pedal is pressed. Happens about 90% of the time. Tried removing and cleaning any ground wire I could locate but didn't change the outcome.

Appreciate others input and if there are exitings threads and posts you cn point me to that would be welcomed.

R467X · 2026-11-11T18:19:34-0600

Check all your ground wires. I don't know if GM still does this but my 2011's negative battery cable ground was between the body and frame with the final connection leading to the front frame. As the years went on and the body mounts failed, the cable began to look as if it was chewed due and caused intermittent no crank, no transmission gear display etc.

Did you check both front and back when your turn signal flashes? Do they flash fast? Is one side not flashing? Hyper flash is usually indicative of a failing bulb.

FitzJJF2026 · 2026-11-11T20:26:04-0600

Thanks for the reply, I will go back and check grounds. Both front and rear right turn signals flash fast and I get the info Centre message shown in attached picture . Both left turn signals function normally.

R467X · 2026-11-11T21:54:36-0600

You should hook up a bidirectional scanner and see if you get a specific code. It could be that entire tail light module though these things aren't simple anymore and you might just need an aftermarket one to fix it or a used one off eBay - that's usually the cheaper route.