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DTC P15C5 is a code related to "Engine Coolant Bypass Valve Position Sensor Performance" so this basically indicates that the feedback from the position sensor within the heater/engine flow control valve was not within an expected range for a given commanded position of the valve.

We've seen this before and almost always the DTC returns when the conditions are met again (usually when the HVAC is being commanded to a particular mode) I suspect the valve will need to be replaced so at the very least you may wish to get it into the dealer to officially log the DTC on a work order, and to give the technician the opportunity to trigger the DTC during functional tests that would prompt the immediate replacement of the valve.

HTH
WopOnTour
 

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No, all 3 of those DTCs are related to issues with the Engine Coolant Bypass Valve.

BUT, the "PORT VALVES" actually is something listed as warranty-able under the terms of the 8-year 100.000 mile VOLTEC warranty

It's just that the term gets missed as these two valves are called something different in the parts system

What is meant by the Voltec term "port valves" is the 3-port valve (aka Engine Coolant Bypass Valve) and the 4-port valve (aka Battery Coolant Bypass Valve) The "x-port valves: were terms coined back in MY2011 with the launch of the Gen1 Volt but were later changed to be more reflective of their actual duties. Yet the old terms remains in the warranty booklets and other GM service and training documents.

To further the confusion the 3-port valve is also referred to as the "Heater Water Shutoff Valve" in the replacement procedure in the service manual

So stick to your guns and refer to list of VOLTEC WARRANTY components in your glovebox warranty booklet. If it's missing you can download the PDF on the Chevrolet.com site


Good Luck!
WOT
 

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Even though you say "No" at the beginning of your message after reading it seems you are saying this should be covered under the Voltec Warranty. Could you clarify?
I was referring to the OPs statements that any of the 3 DTCs were somehow related to the battery charging systems- WOT
 
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