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Now that you have access to the computer you can program your pressure properly and remove that “high pressure” hack sensor so that the computer can read pressure properly in all modes! The reason I was putting my money on the 34 Atmospheric code for the 5 flash was due to the wiring harness...

Do not modify, it gets the speed signal from the CAT ECM which it sounds like you have already changed. I have personally verified that the ABS and CTIS read MPH properly after a change to the Cat ECM, I made this change myself after the ECO hub install.

Were you ever able to pull codes on this ?

20R-7247 is the Reman part number which was 683.82 with a 1026.03 core charge lol. They really want the old one back. https://parts.cat.com/en/catcorp/20R-7247

Yeah sorry about originally mentioning the wrong Pins, I lost track of which connector I was looking at for the J1939 data pins. I think whether you have resistors on there or not, there should be absolutely no connectivity between the power/ground (F&H) and Data (G&X). I guess that you would...

Sorry I meant G & X to F and H, just curious if the voltage could be coming in from some strange harness fault like @Brennan mentioned earlier

Yes this is a super interesting problem. Have you tried measuring resistance between G & X to F and G&X to H at the truck side of the CTIS connector with the controller disconnected ?

I’ve worried about this myself, I monitored it in CAT ET and I feel like when it was REALLY screaming, it was around 2600 rpm at the top, is that bad for the engine? I dunno, but the redline is set at 2800 in Cat ET

Isn’t the default gear 3? Are you try to go to 2?

good question, i know I have seen historic on mine when I was working on my 4 light problem, but I can't say i recall how many times I had power cycled the truck

FYI The lastest version from DANA can pull both active and historic: https://dml.dana.com/assetbank-dana/assetfile/7980.zip My money is still on code 34

I am putting my money on 34 or 35 in that order.

What did you buy for connecting to the truck?

There are 9 codes in the Dana manual associated with a 5 blinking lights condition. The most efficient course of action is to ask the computer what it thinks is wrong with the system. Tearing the system apart and firing the parts cannon is less efficient. Please share the codes when your reader...

As others have said, that is the kneeling valve for air transport. Mine is leaking just like yours right now and I am patiently waiting for non kneeling valve 90s to show up from @TomTime so I can fix it. Unless you plan to air transport your truck or maybe get it into a low garage, you can...

From Dana: https://dml.dana.com/assetbank-dana/assetfile/7980.zip

I had this exact same problem with my 2003. I went to NAPA and bought plugs for the hydraulic hoses and plugged them right at the cylinder. About a week after I plugged the first one, the second one failed and I plugged that side too. It took another 3 or 4 months for them to finally stop...

You are saying that creating the ECM Replacement file did not download the injector trim information? It’s been a while since I have looked at a C7 ECM replacement file, but if you open the file with an XML viewer like Chrome or Edge you will see the injector trim files encoded into the file.

Yeah, seems busticated…. There is a firmware tool that comes with the Dearborn drivers that you might see if it detects the adapter, but that one might be a lost cause.

What does the DG adapter validation tool say?