2012 Switches to gas mode with Battery Charge remaining

19514 Views 52 Replies 22 Participants Last post by hellsop, 1 mo ago

Paul*

Discussion Starter · Nov 5, 2018

I have a 2012 Chevy volt with 140,000 miles. It has not had any issues until now. The car will switch to gas mode while there is still plenty of charge remaining in the battery (as much as 80%). The temperature is well above freezing. Stopping, shutting of the car off and restarting resolves the issue. I took it to the dealer. however, the computer was not writing any errors codes.

Any ideas what could be causing this?

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Paul*

Discussion Starter · #3 · Nov 5, 2018

thanks, I'll see if i can get the dealership to re-scan for error codes

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Paul*

Discussion Starter · #5 · Jan 9, 2019

I still haven't been able to resolve this issue. Dealership has given up! I have been logging data to see if i can pinpoint what is triggering the engine run. It seems to be temperature dependent but is not consistent.

https://drive.google.com/open?id=1zM1YQ6f6yvs6eNdB9_oKKJN8IBw1LHNW . the link will take to you the data. No error codes are being reported. I'm not sure i trust the PIDs titles. I would think the battery heater and battery pump would run simultaneously.
Anyone have suggestions on other Pid i should log

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Paul*

Discussion Starter · #7 · Jan 10, 2019

typically it will switch back to electric after it burns .07 or .10 gallons of gas. similar to a engine run due to 25 deg ambient temp. However, it works pretty hard to increase the state of charge. You can see this in the third graph in the excel file

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Paul*

Discussion Starter · #10 · Jan 11, 2019 (Edited)

Thanks for the input. I'll try the 12v Battery. I will also try bypassing the hood. No messages are displayed when the engine runs.
I wish i could monitor the line of code that is enabling the engine run

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Paul*

Discussion Starter · #11 · Jan 11, 2019

The engine has been run recently. This happens almost every morning when the temps are in the 30's

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Paul*

Discussion Starter · #12 · Jan 11, 2019

Does anyone know what the battery temperature should be maintained at during cold weather operation?

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Paul*

Discussion Starter · #14 · Jan 11, 2019

Thanks, that is what i am seeing also for temps. I'm monitoring the OBD port with Torque pro. Maybe just a coincidence, but i have never seen the issue after the battery reaches 60 degrees. the Battery temp never gets much above 50 when plugged in and remote started. Once i start driving the battery temp gradually increases. (see graphs on previous page). ii would have thought that it would keep heating the battery up to 70 deg when its plugged in and remote started. But it doesn't seem to start heating until i put the car in drive. I left the car unplugged one night and the battery temp started out in the 30's. The engine ran the entire drive even with 70% SOC

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