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Discussion Starter #1 (Edited)
For those that disabled ERDTT using hardware hacks, or wish they could disable it without making any modifications, here is a neat solution. It uses an app called MyVoltHold and OBD2. I tested MyVoltHold app in real world conditions today to disable ERDTT, and it works like a charm!

https://play.google.com/store/apps/details?id=com.thunkable.android.myvoltapp.MyVoltHold&hl=en

The app was originally developed to provide Hold mode for 2012 and older Volts. The hidden benefit is that it can be used to disable ERDTT as well, in all Gen 1 Volts. My Volt is 2013. You pair the app to an ELM327 compatible OBD2 adapter (bluetooth or wifi), and then you can request the engine to turn OFF, from the app.

As per the developer, if you do not want the engine to run too long (ala AriC), you can connect to the OBD2 adapter before you start the car (OBD2 port can be activated by hitting Power Button without hitting brakes) and make the engine off request as soon as you start the car. Another option is to start the car while it is plugged in, make a request to stop the Engine, and then unplug. You need to leave the app running for as long as the car is on.

In summary, this app can
-> Enable Hold mode in 2011 and 2012 Volts
-> Disable ERDTT in all Gen 1 Volts
-> Allow Gen 1 Volt to use battery up to 16% SOC (useful if you want to avoid running gas engine when the battery goes to zero miles just as you are arriving at your home/destination).

PS: This is the OBD2 BT adapter I have been using for last few years. Always hooked to the car (except when I request OnStar to run a scan). Has worked without any issues so far: https://www.amazon.com/gp/product/B00PJPHEBO/
 

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Yep. I used it this morning in 11F ambient temps. Engine fired right as soon as I started the Volt, but I opened the app, connected to my OBDII, and hit "Engine Off" and poof, ERDTT stopped. About a minute later the engine fired as I was driving down the street, so I had to hit "Engine Off" a 2nd time. After that, the rest of the drive was ERDTT free.
 

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Works best if you Hit power but don’t touch the brake
App will connect even though the car isn’t on
Then you can safely fire up for real and immediately turn the motor off.

Other way is to fire up when attached to the charger, connect and set engine off.

If you time it right the engine never starts
 

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Interesting and thanks for sharing, telveer.

"2012 and older"? So this applies to 2011 & 2012? Or did you mean those years that have Hold mode (late 2012 and newer)?

Seems like a bit of a hassle compared to adding a $3 resistor once and never needing to deal with it a again. But if you have the ODB2 hardware and you have the app, it's an alternative.

Of course, I'm one who feels plugging my phone in to the car to get maps is more hassle than a builtin nav. :)
 

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That'a an awfully specific audience for an app to market to (2011 and 2012 owners of Chevy Volts). Good to know that there are people out there creating solutions though.
 

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That'a an awfully specific audience for an app to market to (2011 and 2012 owners of Chevy Volts). Good to know that there are people out there creating solutions though.
I believe this app will allow all Gen 1 owners to defeat ERDTT. But the hold mode feature is specific to 2011/2012 Volts, since 2013+ came with hold mode.
 

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That'a an awfully specific audience for an app to market to (2011 and 2012 owners of Chevy Volts). Good to know that there are people out there creating solutions though.
Seems like something you charge $10 or $20 for because of this reason. I am tempted to try it now :)
 

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in use it on my ampera 2012 with oem holdmode: i can disabling erdtt en diggind to 16% in battery low buffer (oem 22%):cool:

thanks brian!(blkvolt)
 

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in use it on my ampera 2012 with oem holdmode: i can disabling erdtt en diggind to 16% in battery low buffer (oem 22%):cool:
Oh yeah, that too. The app can let you eek out another 0.5 kWh or so out of the battery.
 

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Discussion Starter #11
Interesting and thanks for sharing, telveer.

"2012 and older"? So this applies to 2011 & 2012? Or did you mean those years that have Hold mode (late 2012 and newer)?

Seems like a bit of a hassle compared to adding a $3 resistor once and never needing to deal with it a again. But if you have the ODB2 hardware and you have the app, it's an alternative.

Of course, I'm one who feels plugging my phone in to the car to get maps is more hassle than a builtin nav. :)
App applies to all Gen 1 Volts (at least). For Volts without Hold mode (2011 and 2012), this app provides "Hold" mode. That is the primary goal of the app. Secondary benefit is to disable ERDTT, which works for all Gen 1 Volts. I prefer this method to having inaccurate external temperature displayed on the screen all the time.
 

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Discussion Starter #13
That'a an awfully specific audience for an app to market to (2011 and 2012 owners of Chevy Volts). Good to know that there are people out there creating solutions though.
ERDTT hack works for all Gen 1 Volts. 2012 and earlier is specifically for Hold mode (these model years did not have Hold mode). Obviously, you don't need an app to enable Hold mode for 2013 and later.
 

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I got the app when it was first developed to see how it would work. I have a 2013. It worked with my 2013. I have not tried to use it on the ERDTT, but now I have a real reason to use it.
 

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Discussion Starter #15
Seems like something you charge $10 or $20 for because of this reason. I am tempted to try it now :)
This app is only $0.99 :) I gladly paid that amount to support the developer.

The developer has a different app that works like RemoteLink. That app sells for about $10 but requires a more expensive OBD2 adapter that specifically supports GM SW-CAN, as well as a phone with data plan permanently hooked to the car.
 

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Nice tip about waking up the car by pushing power without pressing the brake.
 

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Thanks for a dedicated thread describing the perks.
If I didn't already get the auto sensor switch, I'd be all over this.
In comparison (to automatic temp switching) it's much more hassle ;)
 

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This is great! I bought it this afternoon, and immediately used it to drive to work and the engine started briefly before I hit the engine off button, will have to time it better in the future.

I like that this gives me hold mode and leaves my temp display alone. I am curious how it does over time, any other issues it might cause? What is the app actually doing?
 

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ERDTT hack works for all Gen 1 Volts. 2012 and earlier is specifically for Hold mode (these model years did not have Hold mode). Obviously, you don't need an app to enable Hold mode for 2013 and later.
my 2012 ampera have holdmode,but in mm of holdmode jou dont charge the battery above 60%soc, unofficial holdmode allow more than 90% soc charge,en 16% soc discharge
 

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Interesting. A few questions:

1. Do you have to keep press "engine off" each time the car tries to ERDTT? And i'm assuming you have to give the "engine off" command at least every time you start the car, correct?
2. What happens if/when the car detects one of the battery cells is too cold and wants to run the engine? This is a mode very similar to ERDTT but not exactly the same. Some of us have experienced this after prolonged cold soaks. Could turning the engine off potentially harm the battery? FWIW, using the resistor hack does not prevent the car from turning on the engine due to battery temp, only due to outside temp.
3. What if you want to use this app to defeat ERDTT but you DON'T want the volt to use the battery down to 16% SOC?
 
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