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My Canyon Duramax is 2-1/2 years old, and at 43,474 miles I took it into the dealership, as over the past week I kept getting a "Reduced Power" warning in the DIC, followed by the "Check Engine" light on some occasions.

The dealership ran diagnostics on the truck and came up with a P041D & P041E Exhaust Gas Recirculation Cooler Temperature Sensor - Position 1 failure. For Diagnostics test and replacement they wanted $560... to replace a sensor. I declined the service, after dealership stated it wasn't covered under warranty, so I could inquire with GM as to why this part, which I assumed was associated with emissions, was not covered under warranty. GM stated sensor was covered under the 36,000 Bumper to Bumper warranty, but not the 5/60,000 Power Train, nor 70,000 emissions warranty.

With that, I decided to look up the cost of the sensor online. If I'm correct, it's GM Part # 55488437 and can be delivered to my door for $48, if it's the wrong one, then the rest are cheaper!

There are two sensors associated with the EGR Cooler - Position 1 and Position 2. I'm going to assume that one is at the EGR, the other is on the exhaust. Can anyone confirm for me that the sensor pointed out by the arrow in my picture - located along the back side of the engine, driver side, near the oil stick - is actually Position 1? I'd much rather replace myself for $48 than pay dealership an astronomical price to replace.
 

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I can't help you with your question. However, I can suggest that if you are in a state that does not do emissions testing, you can just forego this problem (assuming you fix this first) and any future problems by tuning and deleting the emissions and be done with the headaches. Just a thought.
 

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My Canyon Duramax is 2-1/2 years old, and at 43,474 miles I took it into the dealership, as over the past week I kept getting a "Reduced Power" warning in the DIC, followed by the "Check Engine" light on some occasions.

The dealership ran diagnostics on the truck and came up with a P041D & P041E Exhaust Gas Recirculation Cooler Temperature Sensor - Position 1 failure. For Diagnostics test and replacement they wanted $560... to replace a sensor. I declined the service, after dealership stated it wasn't covered under warranty, so I could inquire with GM as to why this part, which I assumed was associated with emissions, was not covered under warranty. GM stated sensor was covered under the 36,000 Bumper to Bumper warranty, but not the 5/60,000 Power Train, nor 70,000 emissions warranty.

With that, I decided to look up the cost of the sensor online. If I'm correct, it's GM Part # 55488437 and can be delivered to my door for $48, if it's the wrong one, then the rest are cheaper!

There are two sensors associated with the EGR Cooler - Position 1 and Position 2. I'm going to assume that one is at the EGR, the other is on the exhaust. Can anyone confirm for me that the sensor pointed out by the arrow in my picture - located along the back side of the engine, driver side, near the oil stick - is actually Position 1? I'd much rather replace myself for $48 than pay dealership an astronomical price to replace.
Silly that they don't include the EGR in the power train warranty. Sorry that I an't confirm from the pic. But if you don't fix it you will have, in addition to the warnings, no jake brakes and/or trailer haul mode. That is a big part of our trucking and I won't pull our ~5000# (loaded) Escape 5.0 TA without that ability...
 

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I have found myself in the same situation @ 67k miles. I ordered that same part # and pulled the sensor you indicated in the photo. It is not the same part # on my 2018 Colorado Z71. Did you ever find the location of this sensor?
 

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I got the P041D code on my Colorado and according to my troubleshooting I had to remove/replace the Exhaust Gas Recirculation Valve Temperature Sensor - Position 1. On the image below:
8940

The image you have attached is the Exhaust Gas Recirculation Cooler Temperature Sensor - Position 2, if I'm not wrong.
Don't have the part number of the one I replace but I'll post it once I get it.

Hope this help.
 

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I have said this before.
And it’s very important that we set up a special post for sensors and positions and where to get replacements
There is to much of this (Not covered under warrant)
Every sensor on these trucks have something to do with emissions so they all should be covered.
Rob
 

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I got the P041D code on my Colorado and according to my troubleshooting I had to remove/replace the Exhaust Gas Recirculation Valve Temperature Sensor - Position 1. On the image below:
View attachment 8940
The image you have attached is the Exhaust Gas Recirculation Cooler Temperature Sensor - Position 2, if I'm not wrong.
Don't have the part number of the one I replace but I'll post it once I get it.

Hope this help.
I recently got both P041d and P041E on my 2016 Colorado diesel at about 106k miles. I googled and found GM part # 12637807 matched this image. During the install I found you need to carefully disassemble the connectors of both the old and new sensors in order to get a 17mm wrench around the sensor's cable to remove old the retaining nut and tighten the new one. When you reassemble the new connector you will need to use the outer sleeve from old connector to mate it properly with the wire harness. The $50 GM part worked fine and no more codes or engine light.
 
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