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Discussion Starter · #1 · (Edited)
New Canyon Diesel, 3200 miles, today when I cranked it to come home from work it throws a check engine light. Once home hooked up to scanner shows 3 pending and 1 Historic. Originally would not would not let me clear any of them. After I disconnected the battery for a few minutes, ever since can clear anything ( weird)

Wondering if any others have seen this.

P133E Power-train is the historic
P2471 Powertrain EGT Bank1 sensor4
P2472 Powertrain EGT Bank1 sensor 4 are the pending

looks like after doing some data logging using my scanner, its showing 3 of the 4 Exhaust gas sensors staying in linear ranges but the 4th is jumping all over from -60 to over 1800....Hoping thats a look at me Im messed up sign? So, pulled the sensor to look for any sort of fowling, that surely should not be there on a 3200 mile system and was not. Checking with a multimeter showed it to be in the 240ohm range when cold and move upward in Resistance as it was heated with a heat gun, however it would jump erratically the warmer it got, back and forth from the 240 or less and the upper limits of infinite. This morning on the way to work after a few minutes quit cycling and now stuck on 1832 deg.

screenshot (003).jpg

Call gmc. No they don't have one and could not for even have one for 2-3 weeks. Would have to make an apt that would take 3-4 hours for diagnosis, only then could they order one, then go back few weeks later for install same amount of time average....does the word REDICULOUS come to mind. All over a $30 sensor readily available at Rock Auto. Guess we all know what path I am taking. As I rarely drive it, Maybe I should have left it in there shop for 2 weeks to count against any future lemon law claim based on a max of 30 days. Average person would not have the luxury I have of not needing to drive it.

For those that might follow, there are 4 of these, and they have 4 diff part #'s. From what I can tell they are all identical at the probe and mounting, but have unique bends where the connector attaches, but can say for sure they would interchange. Should you have yours go out, and get the correlating ODB2 code for location 1,2,3 or 4 here are the ways the AC-Delco numbers correspond based on the attached.
GMC Temp sensor.jpg

I've owned many new vehicles in the past 2 decades, and far and away GM has gotten to be the worst to deal with. I like my truck by the GeneralMotors experience is a total Joke.
 

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"3-4 weeks" is too long. Based on 2 data points, yours and mine, I think this is an all too common problem, and GM should be keeping these in stock. Can't argue with your opinion of GM, based on that. As you probably already know, no TT mode with EGT failure....
 

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Discussion Starter · #3 ·
Bob, couldn't agree more. Here is the real Joke. The parts guy at the dealership said it would take 2-3 weeks just to get the part from Production parts in either Lansing Michigan or somewhere in CA. My part was drop shipped to me in 3 days, coming from...."Production Facility Lansing Michigan"

When I called the dealer I asked WHICH one was actually in my case sensor #4. I have not taken the plunge and bought the FSM, and cant seem to find one online yet, so I was not 100% sure of its location. I was told by both service and parts that #4 was the last one in the chain, and was located at the tail end of the DPF. Yes there is one on the tail end of the particle filter, but #4 is actually located right in the middle....nice to know that are supposed to know, don't... Also Both GM and rock auto show 5 of these, not 4. Part #'s ACDELCO 55499757 - ACDELCO 55499761. Luckily for first timers the part # is actually laser etched onto the output metal stem of the device, But not on the ACDELCO OEM replacement that comes out of Taiwan. OEM appears stainless, replacement does not. Now here is the thing...in Appearance the few that I have noticed while dealing with this all looked just abit different on the output cable side, one had a straight housing, the other a straight but short, this damaged one a 90 deg housing. but the threaded mounting part they all looked the same as did the probe. I pulled 3 of them yesterday and all 3 measured the same ohmic value, all moved similarily based on temp the only diff, was the output connector HOUSING was keyed a bit diff on each. All that being said these range in price from $26-34. Id be willing to the bet they might all be the same....should I ever have aother fail, think I will take the chance and order the $26 just to find out. As1 failed in under 90 days, and 3200 miles I don't at the moment have high hopes for a 20 year 150k life.

Either $26 or $35.....should by no means have to....but that price is a lot let grief/headache/ wasted time than dealing with a dealer on a warranty claim.

Anybody with a FSM, it would be nice to know just exactly the location of these, and which one is 1,2,3 or 4 ( I do know 4)....maybe even where is the mysterious #5.

What is TT mode?...some sort of engine limp?
 

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Sorry mkc1962. "TT mode" was my bad acronym for the trailer towing mode. It failed when (one of my) EGT's failed, and the dealer told me that that was normal. Actually, we were on a 4 month Canada tour, we were towing heavy, and I might have forged on with the failure except for the loss of trailer tow mode. I rely on it enough that I will not tow my Escape 5.0 TA, 21' bed hitch trailer without it....
 

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Discussion Starter · #5 ·
Bob,, gotcha,never thought of that. Well one good thing about these IF they fail on a trip, they are rather easy to access even if lying on ones back....of course at the moment not so easy to obtain, least not on my 2019. Of course you do have to have an OBD scanner, and of course know which position is which.
 
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