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Discussion Starter · #1 · (Edited)
At lunch time, I turned the car turned on with the front defroster enabled in MAX heat with outside temp=38, and no obvious heat, just seat and steering wheel warmers. The heat seemed to be stuck in ECO mode with the KW meter showed 0.5 kw at the stoplight. I tried going to ECO and back to MAX mode to no avail.

After my errand, I rebooted the car and the heat acted normal at ~7kw and heat within 30 seconds. I guess the computer code somehow got confused the first time. When the max heat works, I think the gen2 Volt warms up at least as fast as any ICE vehicle would.
 

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At lunch time, I turned the car turned on with the front defroster enabled in MAX heat with outside temp=38, and no obvious heat, just seat and steering wheel warmers. The heat seemed to be stuck in ECO mode with the KW meter showed 0.5 kw at the stoplight. I tried going to ECO and back to MAX mode to no avail.

After my errand, I rebooted the car and the heat acted normal at ~7kw and heat within 30 seconds. I guess the computer code somehow got confused the first time.
Was the climate control set to Automatic when you engaged Max heat? What was the cabin temperature setting? If your cabin temperature was set too low then the electric heat will not turn on, hence the 0.5kWh power reading.

If it happens again you might want to contact OnStar and ask them to run remote diagnostics and let you know if there are any error codes. My 2017 Volt Premier developed an intermittent internal short in the electric cabin heating module after 16 months, the check engine light came on but there were no other error indications.
 

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Discussion Starter · #3 ·
Was the climate control set to Automatic when you engaged Max heat? What was the cabin temperature setting? If your cabin temperature was set too low then the electric heat will not turn on, hence the 0.5kWh power reading.

If it happens again you might want to contact OnStar and ask them to run remote diagnostics and let you know if there are any error codes. My 2017 Volt Premier developed an intermittent internal short in the electric cabin heating module after 16 months, the check engine light came on but there were no other error indications.
I tried setting the temperature to maximum as well while flipping to max mode. What fixed the problem was rebooting. Luckily, it hasn't happened again.
 

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I tried setting the temperature to maximum as well while flipping to max mode. What fixed the problem was rebooting. Luckily, it hasn't happened again.
What did you do to reboot? Did you disconnect the 12V battery or just shut down, wait and restart the Volt?
 

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I have had issues with my heater too. I took it into the repair shop and they explained that "it didn't throw a code" so there is nothing they can do. Yesterday I was driving on the freeway and all of a sudden ALL my windows fogged over! It was really bad.

How does one reboot a Volt?
 
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