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Hi All,

I'm fairly new to Volt ownership, I purchased a used 2012 Volt around July of this year with 42k miles, I took a trip last week with the family from NYC - Niagara CA - Toronto - Montreal - Lake George- Back to NYC around 1,900 miles total for 5 days. All driving except the first 34 miles was done on gas, highway speeds going up to Canada from 65 - 90 mph, the whole trip averaged an impressive 41 mpg. When i got to Montreal on a local road after 6 hours of driving from Toronto, at a stop light the check engine light came on. I plugged in my ELM Bluetooth reader with the Torq app read the DTCs and got P0AC4, P1E38, P1E39. Next day after a few short trips the check engine light went away on its own, I did not reset it or clear the codes. The car drove perfectly normal even for the short duration the check engine light went on. From what I googled P0AC4 is a generic code for any hybrid fault, but I could not find anything on what P1E38, P1E39 was about. Should I be concerned and take it to the dealer? I've driven another 800 miles since the trip some on electric and some on gas at high highway speeds and the light has not come back on.
 

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P1E38 indicates an open circuit to the transmission fluid pump motor inverter. P1E39 indicates a high current to the transmission fluid pump motor inverter. Is it possible that you hit a large bump just before it happened. It appears that some connector or relay may have opened then closed causing a surge in current, maybe?
 

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Discussion Starter #3
I don't remember running over a pot hole around that time, I do remember making a fast sharp u turn about a minute before I noticed the check engine light on.
 

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Just a wild stab. Have you checked the fluid levels in the reservoirs for the battery and electronics. There have been changes in the recommended levels and there has been a recall to add the required fluid and an anti-tamper collar on one of the caps.

Here is some good reading for you:

http://gm-volt.com/forum/showthread...-the-battery-coolant-MY2014-is-now-gone/page2

And more on the subject with a posting from WOT:

http://gm-volt.com/forum/showthread.php?13192-What-is-the-PROPER-battery-coolant-level
 

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Discussion Starter #5
Just a wild stab. Have you checked the fluid levels in the reservoirs for the battery and electronics. There have been changes in the recommended levels and there has been a recall to add the required fluid and an anti-tamper collar on one of the caps.

Here is some good reading for you:

http://gm-volt.com/forum/showthread...-the-battery-coolant-MY2014-is-now-gone/page2

And more on the subject with a posting from WOT:

http://gm-volt.com/forum/showthread.php?13192-What-is-the-PROPER-battery-coolant-level
Thanks for the links, looks like I have the revised tank with the anti-tamper bracket, the level in it is right between the full and low mark. I will keep an eye on it for the next few months and see if it gets lower which would mean a leak somewhere. View attachment 86314 IMG_20150912_144116.jpg
 

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Thanks for the links, looks like I have the revised tank with the anti-tamper bracket, the level in it is right between the full and low mark. I will keep an eye on it for the next few months and see if it gets lower which would mean a leak somewhere. View attachment 86314 View attachment 86322
Your battery cooling fluid level is low - it should be in the middle of the decal, not below the tank seam.
 

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You pic is tres helpful. Your coolant is significantly too low. You may have a leak but more likely it wasn't filled to the top of the label in the first place -- there have been revisions on how much to fill it -- and over time a bit of the coolant disappeared. The sensor is looking for the air pressure. Just specualation but when you went around the corner you may have sloshed the fluid to one side which triggered the warnings.

You probably want to check out steverino's faq on fluid levels: http://gm-volt.com/forum/showthread.php?119089-Battery-Coolant-and-other-Fluid-Levels-FAQ
 

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Thanks DonC, very comprehensive that Fluid Levels FAQ link. I'll take it to the dealer to have them top it off to the correct level. Hopefully I have the stock fluid that has not been refilled and it went down just because it was 'settling'.

Anyone know if the late 2012's with the higher capacity battery like the 2013's VIN 25xxx+ came factory with the revised anti-tamper bracket?
 
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