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Gretio Common Questions and Answers

What device do I need?

Checkout Which OBD2 Device to buy? – Surreal Development

Why wont my OBD2 device connect?

Make sure you don’t have another device connected. iPhones and iPads really like to hog the device. Then make sure your vehicle is supported https://surrealdev.com/?page_id=56

What phone/tablet do I need?

We use Samsung Galaxies as a baseline. Any modern flagship brand will do just fine. Avoid Xiamoi device.

For iOS any device which runs iOS 14.5 or newer will work fine.

What is “Default” in controls?

Many controls will set some value i.e. EGR to 50%. Default simply means you are returning control back to the ECM.

Default is not the same as “Off” hence the difference. “Off” means you are telling the ECM to turn something off.

How does Gretio relate to OEM tools, SnapOn tools ,etc.

It doesn’t. Gretio was made from ground up with little to no help. While we try to keep naming convention the same as OEM, it’s not always easy. As such the name of PIDs and controls may differ from what your service manual lists.

Can I run more than one control at a time?

Sometimes yes. It depends on the control.

What PIDs should I monitor?

This is a question we get a lot. And with Gretio having over 5,000 PIDs it can be really intimidating to someone only used to classic apps which may have 50 PIDs on a good day.

You should only monitor what you need to know. Don’t monitor things just for the sake of monitoring things.

For performance applications we recommend a baseline:

  • MAF
  • Engine Speed
  • Exhaust Temps (Exhaust Gas Temperature Sensor, Catalyst Temperature, etc…)
  • IMAP (Intake Manifold Absolute Pressure)
  • Turbo Vane Position (if VGT equipped)
  • Accelerator Pedal Position
  • Vehicle Speed Sensor
  • Transmission Slip Speed (TCC Slip Speed)

For other applications (i.e. doing a service regen) you should monitor anything related there.. I.e. exhaust temps, regen status, inhibit reasons, etc…

I don’t have any PIDs or get “Request Timed Out”

Your device needs to be authorized. All genuine iOS devices will work. For Android you must pass SafetyNet.

SafetyNet Checker – Apps on Google Play

We don’t particular care if you pass safety net or not. However, it protects our database systems from DDOS attacks. Were sorry if this means your rooted device will not work.

If you need to bypass this check for commercial use you can contact us. For personal use we just recommend you use a working device.

“Link and Pair New Device” is not working

That’s a Google bug. Use “Link new Device (Legacy)”. Unfortunately not much we can do here and its why the legacy option exists.

I have followed everything in this list and the app is not working.

  1. Step 1 is to restart your phone or tablet. Android in particular has a very buggy Bluetooth stack and there just isn’t much we can do about it. There is a long list of bugs simply restarting will fix. We have contacted Google about these issues but they don’t care.
  2. Lookup how to “Clear Cache” for your device. Then do so for the Gretio App.
  3. If Clear Cache does not work then try clearing all app data.

Why should I use your app over Torque Pro, Dash Command?

Gretio is a real diagnostics scan tool. Made for GM’s UDS implementation.

These other apps are simple OBD2 ‘scan tools’.

Fundamentally two different things. But they use the same OBD2 port.

Why does the app have a subscription?

Devs cost money. Servers cost money. Answering emails cost money.

A tech costs $150/ hourly to push a button…. Gretio is $20/year…. Consider it collective bargaining against outrageous dealer fees.

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