Gretio

Though not super slick and sometimes crashes, this app is an absolute powerhouse for dealing with complex, intermittent sensor issues in modern diesels. Without question, I would not have been able to resolve my issue without it. Be sure to track down their troubleshooting guide if you are chasing diesel emissions issues. The guide brings context to the data and maps a path to resolution.

Look, I’m a Soldier stationed overseas in Italy, NO GMC dealerships here. I got the dreaded “Exhaust Fluid Quality Poor” message in my 2017 Canyon, and I was freaking out, because I still have 3 years left in Italy. I swapped both NOx sensors and the speed limit warning did not go away, I kept searching and I came across the OBDLink MX+ and the Gretio App, I ran the Reductant System Malfunction Warning Service Bay Test through the Gretio App and BOOM! Problem solved! I’ll keep paying the yearly subscription out of gratitude for this fantastic app! Thank you!

Many options and deep diagnostics on every module for these newer models! Great addition for a technician or at home mod fanatic!