He left these out. The problem with the Volt went away almost right away except for a check engine light. Which could mean anything. Especially when the engine isn't being used .... duh.Lol we'll look over your comments to see if they jive with real people. In the meantime keep posting. Reduced
Anyway ... the problem was with something that had nothing with the Voltec system of the car. In other words, because the Volt is 95% normal car, it is subject to problems just like any other new car.
I guess this lying back of manure .... sorry poo .... either didn't see what I found or he did and just forgot to post that.
Wow ... a coolant problem with a car. It's world news to him because it is a Volt. What an idiot.
"Well OK the  P26A9 is related to your Engine Coolant Bypass Valve Position Sensor which is part of your cabin heater system. It has nothing to do really with the Voltec propulsion system. So in that respect it isnt "critical" (beyond your own comfort that is)
Assuming you havnt had a dealer doing anything to your car as of late (this DTC can be set by certain conditions during coolant valve replacement) then it might be simply an intermittent connection on the valve, it's wiring circuit, or in the valve itself (more correctly it's internal position feedback sensor) MAY have a fault.
So if through normal operation over the next couple days the Check Engine indicator DOESNT extinguish, then you should take it to your dealer at your earlist convenience.(and when they are "AVAILABLE" ... Sheesh!)
At the very least even if it goes out and you take your car to the dealer for your "updates" (as you indicated) your should mention both the CEL and the DTCs that Onstar listed and get that on the repair order so it is a matter of record (and on your copy of the RO in the event they dont fnd anything)"
"Thanks WOT for the great info and suggestions (as always).
The engine light is still on after two charges, but the car has been driving fine. If the engine light was not on, I would not know there was a possible issue. To date the dealer has treated me very well. Given that IL was not in the initial roll out, and the car is drivable, I can cut them some slack on this."
Steverino Steverino is offline