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Discussion Starter #1
Got the “service high voltage charging system” error this morning on my 2012, any recommendations for dealership service departments here in Houston, TX? I am working down here for a bit, so don't have access to my usual dealership.
 

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Not sure what part of Houston you are in, but if you are in the Clear Lake area, I have had good experience so far with Norman Frede Chevrolet on Bay Area Boulevard. I haven't had any major work done though other than a few recalls, oil changes and tire rotations.

I bought my Volt in Seattle when I was working up there in 2013 and drove it home to Houston.

Wherever you end up taking it, have them check the battery coolant level sensor on the bottom of the coolant reservoir. There is another thread on this problem:

http://gm-volt.com/forum/showthread.php?255506-WOTs-COOLANT-LEVEL-SENSOR-SERVICE-HIGH-VOLTAGE-CHARGING-SYSTEM-MESSAGE-DEFEAT-PLUG&highlight=WOT+coolant+level+sensor
 

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Got the “service high voltage charging system” error this morning on my 2012...
Got the same error on my 2012 6 Months ago. The service department at the dealership had no clue. The level of the battery coolant was OK. I decided to replace the 12v battery based on several recommendations on this forum - no issues since then.
 

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Discussion Starter #4
I'm in the opposite corner of Houston, Jersey Village. The first dealer I called was not impressing me, they wanted all of my contact info before the would tell me when they could take a look at it. I felt lucky having bought the Volt from a dealer with a decent service department, I read so many horror stories about dealers here on the forum. I guess I will have to go in sight unseen and hope for the best.

I suspect it may be the battery coolant sensor.
 

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Discussion Starter #5
Finally had the opportunity to get my Volt repaired. Took it to Lone Star Chevrolet here in Houston, and they found that the coolant level sensor was leaking. The replaced it, topped off the coolant level and cleared the error code, all under warranty, easy peasy.
 

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If I understand the way the coolant level sensor works, it's outside the tank so it cannot leak. More than likely, the problem is with the sensor, though. Do yourself a favor and read through this thread http://gm-volt.com/forum/showthread....t+level+sensor. Then buy the $25 WOT sensor workaround and never have this problem again.

Otherwise, you likely will be back asking again.
 
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