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NOX Sensor Recalibration


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Recently had a CEL pop up on truck (2021 GMC 3500HD Denali Duramax) with only ~900mi. A trip to the stealer identified a service bulletin to reprogram the ECM with calibration updates to correct a software anomaly.

 

Anomaly? Really GM? I could accept something like this for the first units off the line with a new model year, but a year+ later not so much.

 

Anyone else experienced this?

 

 

Sent from my iPad using Tapatalk

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  • 2 weeks later...
  • 1 month later...

2nd trip with this truck and yet again “Check Engine Light” came on. Has 2100 miles on it now.

 

Scheduling another trip to the stealer to see what it is this time.  I am quite annoyed now, I’ll post an update when I get the truck in for service.

Edited by Utah_ee
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