I haven't done one of these in a few months. Only one think Soot level its to high 140% I will see after regen done. Could I have gotten a faulty AHI Module? Then the same code came up. Might be something more but that normally gets it up and going. Trace or just replace the line back to the regulator and look at the regulator/air dryer good. 21407621 - 14 ppi old stille (2012-2017).
Anything like a leaking clamp, gasket or something that is on the DOC/DPF will cause it also. We changed the AHI Module and 7th Injector (Purchased from dealer). Starting regen and after 3-5 minutes when ex temp it's ~ 435 f the regen stop and coming code P24f700. Truck regened with no problems for about a month after that. Start looking down stream at the temp sensors and the exhaust ducts. 40% soot level is not a big deal. Clean pipe from inj to ahi. Now I give outside air like 40 psi and the regen works perfect. P24f700 exhaust aftertreatment fuel air purge valve stuck closed thermostat. 21407772 - 17 ppi new stille for (2017-). Your issue is there.
45 psi seems high if I remember right. Google has mostly failed me but I found a site that listed how to find it and this is where it lead me. So you put an outside air source on it to 40psi and it worked? The dealers sometimes get mixed up with the parts they give you. They look the same but are not. Did you do a learned data reset after changing out parts? I just change them out together now. I did reset and calibration. P24f700 exhaust aftertreatment fuel air purge valve stuck closed. Check the fuel pressure on the AHI at the sensor. Truck will not regen. The air dryer was changed about 3 months ago, so I don't suspect any water/oil plugging anything up. 7th injector was taken off and cleaned, no blockages.
Check/replace the filter/regulator on the 1/4 inch line that runs to the AHI. Can somebody help me. If so than you found it. I replace control press valve. I have personally got "good readings" on the airline but turned out to be a volume issue. 04-30-2019, 11:10 PM. Check each Cell in the batteries. I gave up taking them apart to check them and the regulator. We took off air lines to AHI Module and they were clean. I have seen the regulator go bad and it reads good but after a couple of minuets the air pressure fluctuates and it stops.! P24f700 exhaust aftertreatment fuel air purge valve stuck closed bank. Old school carbon pile works pretty good. Based on what I've been reading the fuel air purge valve is located on the inside frame on the driver side, right behind the fuel filter. AHI is pushing the correct fuel pressure out.
PTT is pretty spot on with this one depending on the version. We're throwing codes showing that the fuel air purge valve is stuck closed.