Hill Decent Control Fault

These warning lights came on the other day as I was pulling into the parking lot at work. Truck drives perfectly fine. On the drive home the lights stayed off until I pulled into the neighborhood and was almost at my driveway. Both times I had been on the highway cruising 70mph for 18 miles. I called the dealer and got an appointment set up to drop the truck off. Anyone had any similar issues? Truck is a 2016.

I should also add that both times the hill decent was not turned on and the truck was not in 4wd either time.

Had that happen once in my 2015. In a parking lot no less. Cleared the code and it never came back.


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Brian22 said:

I should also add that both times the hill decent was not turned on and the truck was not in 4wd either time.

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Got stuck in the mud and had a whole slew of crap service advance trac, service 4x4 i think and a few more. After we pulled it out i havent seen a single code. Mine had the same dash lights on minus the battery one

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Probably a Wheel speed sensor faulting.
Most abs faults will set advance Trac warning, and hill decent faults

I had this happen, started out throwing those warnings here and there but after a while it was every time I drove it. took it to the dealer and they finally traced it to a wiring loom and had to re-run a couple of the wires on the outside of the loom. worked fine ever since....

I've decided to leave it alone for now since the light has not come on other than those 2 times. If it comes on again, then I'll do something about it.

The truck drives perfectly fine. If it hadn't been for those lights coming on, I wouldn't have known anything was wrong.

Looks like my truck is going to the dealership today. No clue wtf is going on. Took a couple of videos of it to show to the service techs when I get it to the dealer.

First two pictures I was doing 70-75mph down the interstate.

The other two pictures the engine wasn't even running.

Do you have any diagnostic capibility?

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Lubbockguy1979 said:

Do you have any diagnostic capibility?

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Nope. I already have it scheduled at the dealer tomorrow. They will have a loaner vehicle waiting for me.

You dont have any crap plugged into the obd port do you? Like insurance or gps thingies? I have seen both of those cause some goofy chit...

6.0 Tech said:

You dont have any crap plugged into the obd port do you? Like insurance or gps thingies? I have seen both of those cause some goofy chit...

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No. When I left work today everything worked normal with the exception of a check engine light. Hopefully it will stay on long enough for me to make it to the dealer tomorrow afternoon and they can get some info out of their diagnostic equipment.

Screenshot of the video I took as I was leaving work.

no aftermarket led lights anywhere on the truck?

sootie said:

no aftermarket led lights anywhere on the truck?

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I have some Piaa fog lights, they are wired to the battery with a relay and the on/off switch wire getting its power from the radio fuse. Used one of those add a circuit fuse taps.

The lights have been installed since May of this year.

could always disconnect them and see if the issues changes. I have seen out of harness grounds cause some very funky stuff.

I was planning to disconnect them before I dropped the truck off. At least that way they won't try to instantly blame the lights.

Dealership called a little earlier and said they are replacing the PCM. Truck should be ready to be picked up on Monday. Hopefully this fixes the problem.

My harness next to my parking brake caused my hill decent and backup camera to mess up. There is a mod to fix it.

MrGTO said:

My harness next to my parking brake caused my hill decent and backup camera to mess up. There is a mod to fix it.

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I have read somewhere about that harness causing problems for some people. Any details on the mod to fix it?

Got the truck back yesterday after the dealer replaced the PCM. Truck did the exact same thing this morning on my way into work. I'm dropping it back off at the dealer tomorrow morning.

We'll see what they say this time.