NHTSA Complaint #11697429 — 2017 CHEVROLET VOLT

The high-voltage heater control module (also known as the PTC coolant heater / K10 heater module) has failed. This component controls cabin heat and windshield defrost when the vehicle operates in electric mode. The authorized Chevrolet dealer diagnosed the issue, confirmed the failure, and attempted to order the correct GM part. GM informed the dealer that the part is no longer manufactured or available through GM channels. As a result, there is currently no GM-approved repair path. This failure prevents the vehicle from providing windshield defrost while operating in EV mode, which is required for safe winter visibility. I live in New Hampshire, where winter temperatures routinely require functioning cabin heat and defrost for safe operation and compliance with state visibility laws. Because this is a high-voltage thermal management component, there is no safe aftermarket repair option. The inability to obtain an OEM replacement part for a safety-related system prevents the vehicle from operating safely in intended EV mode.