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Discussion Starter · #1 ·
i just had the upstream NOX sensor fault code. It had 2 occurrences stored as well as a permanent code. I cleared the 2 I could (permanent code remained) and the check engine light went out. I drove it for 2 days and now the permanent code is gone.

This check engine light came on after driving 16 miles down a steep mountain grade behind someone driving obnoxiously slow, speeding up and then slowing down repeatedly. I used the exhaust brake as I always do on this trip but had to turn it on and off repeatedly due to the erratic slow driver in front of me.

Think this is any way related?

I purchased a new sensor and it is standing by… should the code return. How long do you think I should wait before I return it?
 

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i just had the upstream NOX sensor fault code. It had 2 occurrences stored as well as a permanent code. I cleared the 2 I could (permanent code remained) and the check engine light went out. I drove it for 2 days and now the permanent code is gone.

This check engine light came on after driving 16 miles down a steep mountain grade behind someone driving obnoxiously slow, speeding up and then slowing down repeatedly. I used the exhaust brake as I always do on this trip but had to turn it on and off repeatedly due to the erratic slow driver in front of me.

Think this is any way related?

I purchased a new sensor and it is standing by… should the code return. How long do you think I should wait before I return it?
Mine just did the same thing, but when the code threw, I lost the exhaust brake. Slightly unnerving. I'm trying to find a sensor that is actually in stock to replace it, I had someone on a facebook group suggest looking for wires that had worn through on the sensor harness.
 

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Discussion Starter · #4 ·
I now have the same code in “pending“ status. So, I swapped in the new one today. I will report back after I get some miles on it. I used one for a GMC Savanna 3500 which uses the same 2.8 engine. It is an OEM AC Delco and it was in stock, unlike the indicated part number for the Colorado/Canyon. I went this route because the aftermarket uses one part number for both the Colorado/Canyon and GMC Savannah. Obviously, they are different OEM part numbers. However, visually, the only difference I see is the Savannah has a longer wire bundle. This could be a mistake but so far it seems to be working fine. The data on my code scanner looks good. I did figure out my old sensor kept dropping to a zero reading sporadically. I do not believe that is normal. Again, I will report back after I get some miles on it.
 

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I now have the same code in “pending“ status. So, I swapped in the new one today. I will report back after I get some miles on it. I used one for a GMC Savanna 3500 which uses the same 2.8 engine. It is an OEM AC Delco and it was in stock, unlike the indicated part number for the Colorado/Canyon. I went this route because the aftermarket uses one part number for both the Colorado/Canyon and GMC Savannah. Obviously, they are different OEM part numbers. However, visually, the only difference I see is the Savannah has a longer wire bundle. This could be a mistake but so far it seems to be working fine. The data on my code scanner looks good. I did figure out my old sensor kept dropping to a zero reading sporadically. I do not believe that is normal. Again, I will report back after I get some miles on it.
What is the part number for that sensor? I just bought a Herko aftermarket unit out of desperation.
 

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The new number is now 24001920. I ordered an upper and a lower from "gmpartsonline" to store in my RV. I really don't want to be out and about and have one of these take a crap and be stuck somewhere far from home. Worst case having to go to a dealer somewhere and being told it's a NOX and it will take XX days to get it. I can at least provide it and get the repair done. Most likely I will fix it myself do to lack of trust anymore. I have a box in the trailer with those two in it and a pressure differential sensor.
 
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