Gretio

Don’t bother with the rest. Just get this app and you will have some control over your diesel. My truck Colorado 2.8 Diesel flashed power reduced DPF pressure to high. I was able to run (with this app) a regen of the DPF and the code cleared. If it wasn’t for this app I would have been a hostage of the dealer. Great app. Thanks

I got the dreaded exhaust fluid quality poor and I was 60 km away from being restricted to 8kmh. My scanner would not do anything and the dealer couldn’t get me an appointment for 3 days. I need to get around and go to work so I ordered an OBDLink MX+ on same day delivery. When it showed up I plugged it in and installed Gretio on my iPhone. Did a manual regen and then did a reductant fluid quality test. The test passed and the ECM was cleared. Total time to setup and fix the problem was about 30 minutes. I was very impressed with the app it is very plain and simple but packed with everything imaginable for my 2.8 Duramax Diesel. Also with bi directional communication it does more than any other app I have ever used. A lot of work must have gone into the programming of this app. Well worth the money spent.

The combination of this app and its concise diesel emission trouble shooting guide are invaluable! Using them, along with OBDlink MX+, I was able to resolve the “Exhaust Fluid Quailty Poor” issue that was on the verge of bricking my LWN diesel. Being able to conduct diagnostic tests to resolve diesel emission issues removes the haunting fear of diesel ownership. I give thanks to the developer for sharing his skill and automotive passion!

Could you please fix the issue of not connecting to the OBD Bluetooth device. It shouldn’t take 10 minutes and 87 attempts

When all other scanners and code readers failed, this app let me do a service bay test that cleared that code after I changed my NoX sensors. Cannot say enough good things!

Don’t waste your money on this one Very basic do nothing app that advertises as equal to torque 1

I was excited to purchase this app and happily pay for quality. I was highly dissatisfied given the description in the App Store did not give caveat that there is not a very long list of supported GM vehicles. I had to find out after sending an email to the developer. Once I got that email I had to go to the Gretio support site and find a link of supported vehicles. This link should be front and center in the app description so an informed decision can be made before purchase.

When CHanging injectors on a LML duramax you have to enter the code from the new injector both in the ecm and in the GPCM. This only seems to let you do the ecm, so you get an incompatibility code on your truck!!! Fix this please!!!!

Used it to run a service bay test to check what was going on with my sensors and def system. App is awsome and I don’t mind paying the $20 so the devs can keep this app updated. Awsome job on this. Will be testing more with this app in the future.