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Discussion Starter · #1 ·
Please see vehicle information attached (year, make, VIN), and other info about mods, mileage, purchase date. Codes are being thrown primarily during a tow scenario; 11k lb bumper pull toy hauler (as weighed at scale fully loaded), and a 1200 lb bass tracker.

I have recorded the last 10 DTC events in hopes that I can get a second opinion, other than the dealerships direction to “replace EGR valve, NOX #1 sensor, and the MAF sensor”, with the caveat that if codes come back, bring the truck back for further diagnosis. That to me sounds like guess work, and I'm not willing to pay $2500.00 (for a guess). All DTC events have been cleared, with exception to #10.

Rectangle Font Material property Parallel Screenshot

As you can see, the common theme in every event, is DTC P2453 DPF Sensor “A” Circuit. I do not know the last time (if ever) that the DPF was replaced. I do know that regens (as shown on CTS3) on a regular basis, which I have recorded as about every 300-400 miles (while towing), maybe every 120 miles while driving in town (unloaded).

Event #2, occurred just after dealer serviced all fluids and filters. Those codes were present before, so I am not saying the dealer jacked anything up. Just providing that for reference as a baseline overall vehicle service date.

Event #3 I cleaned the MAF with MAF cleaner, thinking the sensor may have gotten some K&N oil on it. I was able to drive truck about 300 miles or so, before the P0101 code came back in event #6. Re-cleaned, cleared, and then DTC P0101 fired back on again about 10-20 miles later.

Event #9 was concerning as I noted an immediate EGT #1 temp spike while towing. EGT #1 temp usually holds steady at about 800 degrees (towing on highway and loaded). During flat towing, check engine light came on and EGT #1 piked to about 1100 degrees with “reduced engine power” notice on instrument panel. At same time I also noted trans fluid temp rising to a max of about 220 and holding. EGT #1 temp dropped back to normal about 10 miles later, trans temp back to normal (140-180) about 30 miles later. All codes forced cleared, never experienced reduced power. Another 20 miles later event #10 occurred, temps normal. Parked ever since.

I understand this is a lot to digest, and I may have forgotten to include details needed to properly diagnose. I have not gone back to a paper air filter, but I can assume this goes beyond that simple of a fix. I have checked most of the related sensor wiring harness areas (the places I can get to), and have not noted any chaffing or issues. Looking forward to professional input and systematic approach to correct.


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