My oil was changed about 5 months & 10,000kms ago and it says around 80% oil life left for me. That might take a heavy dive when the weather gets colder.
Interesting. Please keep us updated.
I wonder if it's the Low coolant sensor issue.
Was it a SERVICE HIGH VOLTAGE CHARGING SYSTEM (SHVCS) message?
So, following up...yes indeed, it was the (common) SHVCS issue.
It started about a month or two back, was extremely intermittent, but I was able to clear the code with my iPhone/Scantool combination. I also knew what typically triggered it (the notoriously wonky sensor in the battery coolant reservoir), and since it was perfectly full and showed no signs of any leakage so there wasn't an actual problem, and in the end I wasn't overly concerned about it.
I
did call OMS about the issue a few times but they said that the fact I was clearing the codes meant they wouldn't be able to address the issue - I had to take it to them with the codes still active, even though I had a record (as did OnStar) of what they were. On the flipside, when the code DID come up and I called them to try to get it in, they kept saying it'd be 3-5 days before they could "fit me in". In the meantime, since (for those reading) this code
prevents charging, my wife would be driving 100% on gas until such time that they would even look at it, and since I already doubted their familiarity with the Volt in general I questioned if they'd be able to easily diagnose it even after the fact. Accordingly, I just pushed it off over and over again, and it was so seldom that it wasn't bothersome.
But a few weeks ago it started to get more frequent. Twice in one day, then twice in 3 days...and since the car is coming up to 160,000KM where the Voltec (electric drivetrain) warranty is set to expire I figured I'd best get it in soon.
I opted for a new dealership near where I live given my entire lacklustre experience from OMS. Those who have followed the thread for a while will remember that it took several days for them to even get the car charged properly for us when we were initially looking at it, then there was the brake caliper issue that I got some run around on..and then the OnStar issue. Admittedly
they did fix it all at no cost to me in the end, but it was only after a lot of chasing and some strong negotiating - someone less strong willed than me would have probably gave up on getting both fixed, or just paid the nearly $1000 cost of getting the brakes and OnStar fixed.
Between that and the issues trying to get this issue addressed, I have moved on to a new dealer.
The new dealer on the other hand, well...I went straight to the service manager when I first called, explained the situation (as well as OMS's refusal to even see the car unless we left the codes active), and he said it wasn't a problem. Scheduled us in for first thing Monday morning and said he'd personally take care of it all. He also mentioned that they were very familiar with the Volt (having apparently sold the first one ever in Canada), and they had 2 electric techs on site. Cool.
Anyhow, it went in this morning at 7:30AM. By 10:30 or so they called and informed me that it was indeed the common sensor issue, and that everything else checked out fine. The part is on order an the car will be fixed tomorrow
completely under warranty.
