Posted by MarkB_MI on August 17, 2022 at 04:30:06 from (174.211.37.60):
A couple of days before we were planning to take a trip, my 2017 Duramax lit up its Check Engine light. No time to take it to the dealer, so I pulled out my OBDLink scanner to see what I could find. The code P026D was stored, so I googled that. I quickly found a bunch of posts saying to clean the TMAP sensor. Once I figured out where the TMAP sensor is (it's right on top of the turbo-to-intercooler manifold), I pulled it out and it was totally plugged with soot. I cleaned it up, re-installed it and cleared the code. 2400 miles later, after towing the camper to Maine and back, no check engine light.
Apparently this is a known problem with the L5P engine; soot from the EGR fouls out the sensor. You can buy an aftermarket spacer that supposedly fixes the problem, but it's so easy to clean the sensor I'll just do that every 20K or so. (I have about 80K on my truck.)
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Today's Featured Article - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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