Gas mileage and Thumping noise

Bigdaddy · Feb 28, 2022

wsutard1 said:
They all have it. When the thumping starts roll your window down. It will stop when the window gets to about half way. Roll it back up and it will start again.

It’s the ANC system gone whack. You need to take it to a dealer. Have them verify and then they will order a new amp for you. Which is currently on backorder.

If you can’t stand the thumping then there are posts on here about how to disconnect the ANC mics which essentially turns off the ANC system and stops the thumping.

I told my dealer that when I unplug my amp the noise will stop so they order me another amp but like you said it's on backorder. If you like myself I have the alfabod I went and using the alfaobd "NOT ENABLE" the ANC feature for now but I haven't drove it since I change it.

wsutard1 · Feb 28, 2022

Bigdaddy said:
I told my dealer that when I unplug my amp the noise will stop so they order me another amp but like you said it's on backorder. If you like myself I have the alfabod I went and using the alfaobd "NOT ENABLE" the ANC feature for now but I haven't drove it since I change it.

I’m hesitant to mess with Alfa while having warranty issues. They can see when changes are made. Not that they would call anyone out. For now I just unplugged the mic wires.

Bigdaddy · Mar 1, 2022

Oh, I wasn't aware of that maybe I better put my back like it was, thank you. So how do you unplugged the mic wires and is it working, are their six or four of them?

wsutard1 · Mar 2, 2022

There are 4 sets so 8 total. Follow this write up.

How To Disconnect ANC at Amp

So I have had a terrible time with the ANC system. After 2 trips to the dealer STAR has no clue on it after they replaced the amp. I inquired about disabling the system. STAR didn’t even know if it was possible. STAR want the vehicle to run some scans, but since it was not a drivability issue...

www.ramforum.com

Just make sure to take pics so you can plug them back in before you go in for the new amp.

Bigdaddy · Mar 2, 2022

Okay, so did that work for you, the reason I ask is that I order the wire harness that you can plug in your amp and the wire harness it will bypass those mic wires so you don't have to pull those wires out? I bought that and I still had that thumping noise so I call the company and he told me that if I had the Karmin 17 speaker system I want work, now unless it does it differently.

Here: https://lljcustoms.com/products/2018-2022-jeep-dodge-ram-llj-anc-bypass

Do you know anything about this then?

Bigdaddy · Mar 2, 2022

But right now I'm game for whatever work and I will take a look at it and try it, I cancel my dealer appointment for the 2nd because all they were going to do is to look at my check engine light but I told them that I don't have that any longer.

wsutard1 · Mar 4, 2022

Bigdaddy said:
But right now I'm game for whatever work and I will take a look at it and try it, I cancel my dealer appointment for the 2nd because all they were going to do is to look at my check engine light but I told them that I don't have that any longer.

Just unplug that white harness going to the amp under your seat and go for a drive. If the thumping stops then it’s ANC. Sometimes the bypass cables don’t work. In that instance you need to unplug the wires. If it’s an ANC issue then I guarantee unplugging the wires will stop the thumping.

wsutard1 · Mar 4, 2022

I looked at that plug you listed. It says all Ram trucks with no sub. Since you have H/K system it won’t work for you. After you have your appointment for the thumping then unplug your wires while you wait for the new amp.

BNeal · Mar 4, 2022

Dodge trucker said:
less mileage on the highway? Makes no sense.

It does above 75 mph - especially if you have a 3.92 gear.

Jerrybob · Mar 4, 2022

They make a bypass plug.......like this one....there are others as well.

Jeep | Dodge | RAM ANC bypass harness 2018-2023

The Active Noise Cancellation, or ANC, in your vehicle is designed to pick up on low frequency road noise and cancels out any undesirable sounds, making your drive a quieter and smoother ride. The ANC in your vehicle can become a major headache when adding aftermarket equipment, such as...

lljcustoms.com

Bigdaddy · Mar 4, 2022

wsutard1 said:
I looked at that plug you listed. It says all Ram trucks with no sub. Since you have H/K system it won’t work for you. After you have your appointment for the thumping then unplug your wires while you wait for the new amp.

Ohhhh, okay you're right I should try that soon the dealer told me that it will be a few months before they will get it in, they on backorder so I printed out everything I need to do this so I will be pulling those wires. Thanks again.

Bigdaddy · Mar 4, 2022

HEY, guys I think that I might have find what's going on here, I hope I did send them to the dealer so they can look at this I took better pictures with my phone and I hope that you guys can see it but a few of the wires are exposed that goes inside the plug going to the amp. Sometimes when I even open my driver side door I will hear a little kraken noise, not a lot but just enough for me to hear it. Check out these pictures I try to take better pictures but it was hard to take them, because the plug that goes to the amp is under the dash.

Bigdaddy · Mar 4, 2022

Sorry for so many pics but I wanted you guys to see what I believe is what is causing this noise so look at your plug going to the amp.

wsutard1 · Mar 4, 2022

I see the exposed wires. Very weird to see that on a new truck. If we hadn’t already been talking I would have guessed that you did that by trying to take the wires out. However, I know you didn’t do it because of our conversation.

wsutard1 · Mar 4, 2022

Other thing I’m noticing, it looks like the wires that are bare are not the ANC wires. The ANC are the 4 top and bottom next to the large red wire.

mcarey · Mar 4, 2022

Hunt4Ever said:
Possibly, trying to figure out if truck has it...or not...

On the HDs, it shuts off if you roll down the window. So that's one method if figuring it out. Or look up. There are a handful of microphones in the headliner. I know there are at least 4, again in the HDs.

Gas mileage and Thumping noise

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