Boost Pressure + DEF Gauge (2 questions)

[Buckrub]

I'm a bit embarrassed to post this. But I cannot find the answer in manual or Google. I am not a gear head. I have this truck to pull my 5th wheel, and occasionally my boat to go fishing. Had a GMC first (everything on it failed, lol) and now the 2023 Ram 3500 2WD HO/Aisin. That said, it sits in driveway a lot. After 11 months of ownership, it has 4,400 miles, and that includes a trip to Florida and back for the winter.

Just drove it to town. On freeway for only 2 exits. Mostly in town. FYI. Two things I cannot figure out.

1. The display of gauges shows everything is fine, within limits, but Boost Pressure is zero. I am assuming (don't laugh) that is for the Turbo? Maybe it is zero because it's not under much of a load just driving around???? If that's not it, why is it zero and what is the potential issue?

2. This one stumps me. There are actually 2 gauges for DEF Fluid. I have not added DEF since I got it. There is an Analog gauge and it shows over 50%. But when I just drove to town it began a Regen, so I drove down freeway enough to finish that. When it started the Regen, the digital DEF gauge was barely above zero, just barely above zero. When it finished, the digital DEF gauge shows nada, zero, nothing. However, during the entire process, and continuing and currently, the analog gauge still shows above 50%.

I parked it in driveway, and I'm not moving it till I add DEF and see how much it holds. But I cannot figure out which gauge is accurate, if either one, or which one to trust.

Any help is appreciated.........even if you laugh at me.

 

[AH64ID]

1. The display of gauges shows everything is fine, within limits, but Boost Pressure is zero. I am assuming (don't laugh) that is for the Turbo? Maybe it is zero because it's not under much of a load just driving around???? If that's not it, why is it zero and what is the potential issue?

When does it show 0? It should be 0 at idle and when coasting with low rpms. It should be above 0 with just about any throttle applied in gear.

Are you looking at the page with a analog and digital display? Or just analog? (both gauges are on the digital dash, so analog is the needle and digital is the numerical readout)

2. This one stumps me. There are actually 2 gauges for DEF Fluid. I have not added DEF since I got it. There is an Analog gauge and it shows over 50%. But when I just drove to town it began a Regen, so I drove down freeway enough to finish that. When it started the Regen, the digital DEF gauge was barely above zero, just barely above zero. When it finished, the digital DEF gauge shows nada, zero, nothing. However, during the entire process, and continuing and currently, the analog gauge still shows above 50%.

It sounds like your looking at the DPF gauge as a DEF gauge, and they are different. The only DEF gauge is the fixed analog one in the bottom left of the cluster.

The DPF gauge shows the soot loading of the DPF and when you're in an active regen.

DEF has nothing to do with regen.

Are you sure you haven't added DEF? 4,400 miles on less than 1/2 a tank doesn't seem correct.

 

[Buckrub]

Well, you're right, and I'm even more embarrassed. Old eyes, I guess. Yes, I saw DPF and thought it said DEF. So, the analog gauge below the cluster shows above half, so I'm sure it's ok. *sigh*

The Boost Pressure is on the VEHICLE INFO on the display above steering column. Item # 2 or # 3 or some such. Flip through them by arrowing right or left. I will have to check that again when underway. But I thought I did and it stayed zero. I'll check again.

 

[AH64ID]

I still feel like DEF must have been added at some point to have more than 1/2 a tank left after 4,400 miles.

My truck is at 3/8 of a tank of DEF after less than 2K miles and minimal towing.

 

[Buckrub]

Old eyes, even older memory. I did add some last winter after towing to Florida. I was just afraid there was an analog and a digital readout for same thing and that they were out of synch, and worse, I was out of DEF. The GMC went into Limp Mode when fluids went to zero or other reasons......not a pleasant thing while towing 16,000 lbs. I'm going to have to get better glasses........memory, not sure what to do about.