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  1. Problems, Driver Warnings or DTCs - Gen 1 Volt
    Only seems to run on battery power when driving under 20 mph in town…hoping I didn’t buy a volt with a junk battery. I am in iowa, and it has been under 20 degrees the whole time I’ve owned the car. From what I’ve read on here is that ERDTT can cause the the ICE to run periodically, but I’m...
  2. Problems, Driver Warnings or DTCs - Gen 2 Volt
    I own a 2017 Volt and a few days ago, during a cold winter day with my Volt plugged in at home on a L2 charger in my (attached) garage, I used my app to pre-heat my Volt. When I walked into my garage, I was horrified to see that the engine was running!! Inside my attached garage with the main...
  3. Accessories, Apps, Modifications - Gen 2 Volt
    Hello everyone. My trusty 2012 Volt met its demise recently from a small accident that damaged critical (expensive) components. 180k miles with the original front brakes still. I am getting a 2017 Volt next week. On my 2012, I tapped into the temperature sensor wires going to the computer...
  4. Generation 2 Chevy Volt (2016-2020)
    Greetings all fellow Volt drivers and experts. I have a bit of information to share after having installed joesonvolt's ERDTT bypass temperature sensor I bought on eBay. I have a 2018 Volt Premier, the Cajun Red (or is it Crystal Red?) paint color, that I bought and began driving at the end of...
  5. Accessories, Apps, Modifications - Gen 1 Volt
    With winter approaching and a relatively nice day, I decided to install my modified ambient outside air temperature sensor. It has a small 1/8W, 39k Ohm resister wrapped around the two sensor poles. This resistor tricks the sensor to see a higher temperature than actual. The result: the Volt...
  6. Use, Care & Maintenance - Gen 1 Chevy Volt
    I'm proud to have finally joined the Engine Maintenance Mode club. This is a great day. It means I'm not using gas anymore and the Volt had to fire up the gas engine for a few minutes to keep things working and maintained. For years I have seen posts by those complaining about EMM, but for me...
  7. Accessories, Apps, Modifications - Gen 2 Volt
    What I wanted: Normal operation when desired Force off mode when making short trips below ERDTT temp. Force on mode when making long trips (further than full charge) but still want SOME heat (ie: ~34°) Well, this is exactly what I've got now. :D I've got 3 resistors I can choose from: a fixed...
  8. Generation 2 Chevy Volt (2016-2020)
    I was just curious if this would look like the expected gas usage in the winter months due to ERDTT coming on. On short trips lately, ERDTT has been engaging and using a fair bit of fuel for very short trips. Don't mind the dust in the photo!
  9. Generation 2 Chevy Volt (2016-2020)
    Has anyone ever tried this approach to avoiding ERDTT situations? If there is no gas in the tank, will the car simply cease to function, or is this a way of effectively forcing the car not to start the engine at ~15 degree temperatures?
  10. Generation 1 Chevy Volt (2011-2015)
    This was a new one on me - maybe others have seen this behavior. Here is the scenario: Driving home from my Dad's house which involves a hill climb that is borderline mountain-mode needed (I have been caught out once on it with the reduced power thing). I engage mountain mode as I was...
  11. Accessories, Apps, Modifications - Gen 1 Volt
    I purchased the mod found here: http://gm-volt.com/forum/showthread.php?143882-Just-installed-new-model-ERDTT-switch&highlight=ERDTT I didn't have any trouble installing it, but am getting readings that don't seem at all appropriate and am curious if anyone else that has tried this has...
  12. Chevy Volt News, Events
    This is my second winter of driving my Volt. I did not realize last winter that I could get heat with Fan Only. I always used ECO to get heat. My drive is 56 miles round trip and I usually get 28-34 electric miles when the temperature is in the 20-30s. This winter, by chance, I selected FAN...
  13. Suggestions for GM - Chevy Volt
    Dear fellow Volt owners, and prospective owners, GM did announce that the infamous ERDTT (Engine Running Du To Temperature) - only used to provide cabin heat - will be back in the 2016 Volt. In northern countries, the use of ERDTT makes the Volt highly inefficient in short trips, even just to...
  14. Accessories, Apps, Modifications - Gen 1 Volt
    Alot of people ask me for a controllable from inside the car ERDTT disabling add-on module or a tri-mode option for enabling ERDTT at any temperature for long trip what do you think of it ?
  15. Chevy Volt News, Events
    HI, I have a 2014 volt. I have notice twice this winter that ERDTT now shuts down by itself during a single trip after temperature rises over set point. I mean without shutting off the car to reset. It was not like that last winter, after being on, it stays on whatever the temperature change...
  16. Chevy Volt Engineering and Design
    Well, I just got home after my car was parked outside in -18 to -21C for nearly 10 hours. I wasn't expecting the battery to be locked out so easily (people quoted 'days' for this kind of thing to happen), but instead of normal ERDTT to greet me (which I hate enough as it is), the car hesitated...
  17. Newcomers, Owner Stories, FAQs
    Hi kids, so this is my second winter with an early build 2014... love the rig overall of course. I've been lurking at this site for a while, answering most of my questions without needing to post. However, finally I have to break the silence. I bought in late 2013, so I had the choice between a...
  18. Accessories, Apps, Modifications - Gen 1 Volt
    For those aggravated by the ICE running during short trips in the winter months, there are a few mods for preventing or delaying ERDTT. Note that employing some of these mods may or may not cause warranty issues if there is a problem later on. The location of the air temperature sensor that...
  19. Chevy Volt News, Events
    Hi, Had my ICE do a maintenance burn for about 10 minutes Saturday. Thursday it ran for 20 minutes due to cold temperatures, was 0 here. The maintenance was at a higher rpm (going by sound), I was surprised it had to run at all because of running on Thursday. I have a 2013. It ran...
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